A wild Blattella species apparently closely allied to the German cockroach, Blattella germanica Linne, has been known to occur in the coast area of western part of Japan. Furukawa (1948) supposed it to be the same with Blattella bisignata Brunner von Wattenvyl which was, however, described from Burma and now believed to be a geographical race of the small-sized South Asiatic Blattella lituricollis Walker. The present author came to the conclusion that this species represents a distinct, undescribed species, and named it as Blattella nipponica sp. nov. The main distinguishing characteristics are, when compared with those of Bl. germanica, as follows : 1. The paired black stripes on the prothorax broad and always show the tendency to access each other at the posterior ends (Fig.1) 2. The structure of the dorsal glands of the male 7 and 8 abdominal segments quite different, and there are numerous short bristles on 7 segment (Fig. 2, 3). 3.The male subgenital plate short and broad, the assymmetrical depression, when seen from ventral side, is shallow; the two styli situated closely (Fig. 4, 5). 4. The left epiphallus of male genitalia ending in a claw which is sparcely punctured (Fig.6). 5. The female supraanal plate, in a fresh or alcoholic specimen, slightly emarginated at the posterior end, with two dark spot at the base (Fig.7). This species distributes in the southwestern part of Japan as far south as Tanegashima but never found in Ryukyus (Fig. 9). The type specimens are selected from Tanegashima material. The life-history is not still sufficiently made known, they are found in the roadside grass-land of seaside, or under dead leaves collected at forest edge, or among decayed vegetable matter in cultivated land. Overwintering is made during later larval instars and two generations are supposed to be passed in a year. These can be bred in a laboratory by similar method to the German cockroach. It may be interesting to note that this species can fly while the German cockroach does not; attempts to hybridize both failed so far.

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Literatures on a squirrel flea, Monopsyllus indages (Rothschild, 1908) occurring in Japan were briefly reviewed. M. indages lis Ono, 1956 was recently synonymized by Sakaguti and Jameson, 1962, but, based on new materials, the author made further investigation and came to a conclusion that these two subspecies could be separated by the following key : The structure of apical membrane of sternite VIII complicated (Fig.A, 4-6); posterior arm of sternite IX rather broad and stout (Fig. A, 7-10); aedeagal chrochet curves and pointed at apex (Fig. A, 1-3); in Hokkaido‥‥‥M. indages indages Apical membrane of sternite VIII simple (Fig. B, 4-6); postrior arm of sternite IX rather slender (Fig. B, 7-10); aedeagal chrochet broad and straight and terminated bluntly (Fig. B, 1-3) in Honshu and Shikoku‥‥‥‥‥‥‥‥‥‥‥‥‥M. indages lis Females of two subspecies are unseparable at present.

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Comparative studies were made to see the effects of humidity and temperature on the breedings of three species of the grain mites, Tyrophagus dimidiatus (T.d.), Aleuroglyphus ovatus (A.o.) and Glycyphagus destructor (G. d.). In T. d., the optimum condition for the highest densities in their breeding in dried yeast was 75% in relative humidity (R. H.) and 25℃ in temperature, and the ranges of humidity and temperature to allow its breeding were relatively restricted. The optimum condition for A.o. was seen at 85% R. H. and 30℃, and the ranges were much larger, since the species was found to breed under the low humidity, or up to 35℃ under the high humidity, under which condition the former species could not survive. In G.d., the optimum was 85% R. H. and 25℃, and the velocity of the breeding was generally slower than in the former two species. Further experiments were made to compair the effects of humidity and temperature on the ratio in densities of the above three species cultured in the same food samples. The material inseminated was the mixed culture of the grain mites with A.o. as the predominant species. In all the samples kept in low humidity, or in those at 25℃ and 30℃ under various humidities, A.o. maintained the highest in the density, and all the other species were found to disappear at 30℃. At high humidity and at 20℃, either G.d. or T.d. became the dominant for certain period.

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Insecticide susceptibility in five species of mosquito larvae, i. e. Culex tritaeniorhynchus, Aedes togoi, Anopheles sinensis, Armigeres subalbatus and Culex bitaeniorhynchus, and that in three species of abult mosquitoes, i. e. Culex tritaeniorhynchus, Arm. subalbatus and C. bitaeniorhynchus were studied with dipping method and topical application method, respectively, in 1962. All of the species tested were highly susceptible to Baytex and Sumithion, especially to the former chemical, and were less susceptible to Diazinon and malathion. It was noticiable that C. tritaeniorhynchus was extremely susceptible to DDT.

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1) This paper deals with the control effect of soil fumigant D-D and DBCP against the pupae, Musca domestica vicina during 30th July and 23rd November in 1960. 2) The distribution of pupae in glass cylinder (diameter of 9.5 cm, depth of 30cm), the number of pupation of larvae in 3cm depth are the most abundant, although they distributed around between 1-14cm depth, and the number of individuals showed 81.8, 17.7 and 0.68% of the total in each 5cm depth downward. 3) According to the result of experiment, when the each solutions of D-D (0.2, 0.6, 1.2, 1.8, 2.4 and 30cc) was poured into the soil in the depth of 5, 10 and 15cm separately it is known that the emergency was never occured. The efficiency of 2% emulsion of DBCP (0.2, 0.5, 1.0, 1.5 and 2.0cc) against the pupae in the soil showed lesser effect than D-D solution, which showed 90% control effect at the following conditions : 2.5cc DBCP applied in depth of 5cm, 30cm, and 10cm, respectively. 4) According to the result of experiment being sprayed with D-D, DBCP, lindane, dieldrin, aldrin and endrin, on the surface of the soil, 11 adults emerged out among 100 pupae with D-D and 82 adults with DBCP, 75 with lindane, 93-dieldrin, 92-aldrin, 79-endrin respectively. 5) As the result of field test of D-D solution, only 7 individuals were emerged out of 100 when D-D poured into 15cm depth. But DBCP showed control effect as followed : 54.5, 32.5, 33.5% at each depth of 5, 10, 15cm. 6) Although this paper showed the results under the natural temperature. It is thought that further examination should be carried out under the condition of lower temperature.

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Sarcophaga pseudoscoparia is fairly common in Europe, but hitherto it has never been reported in Japan and Korea. The authors obtained two male specimens in 1962. The first specimen was collected by Soung Ho Park on Mt. Pal-gong, Korea, 28 June 1962. The second specimen was collected by Mr. Kiyoyuki Mizusawa on Mt. Orofure, near Noboribetsu, Hokkaido, Japan, 22 July 1962, who, in turn, gave the specimen to Senior author for further study and investigation. Sarcophaga pseudoscoparia seems to be very rare in both these countries.

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The result of the research on the seasonal prevalence of the smoky brown cockroach, Periplaneta fuliginosa Serville in the house at miki-cho in Kagawa Prefecture, extending from 1960 to 1962, was described in the present paper. Although the outline of the result was shown in Fig. 1 and Fig. 2, some considerations and discussions on the prevalence of its stage or our control were also made in this paper.

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