臺灣産ノ鷄ノ赤虫Neoschöngastia gallinarum (Hatori, 1920)ニ就テ

抄録

Since Dr. Hatori (1920) discovered the Formosan chicken mite (Trombicula gallinarum) from the chicken, kingfisher, goatsucker and raven, the present author observed the species from several chickens and sparrows too.
The species have five setae on the scutum in addition to the pseudostigmatic organs which are strongly capitate and each chelicera bears but a single dorsal tooth near the apex, and the palpal claws are trifurcate. Therefore, the present author believes the species belongs to the genus Neoschöngastia Ewing, 1929.
Neoschöngastia gallinarum (Hatori, 1920).
syn. Trombicula gallinarum Hatori, 1920.
Body oval; striations prominent, slightly crenulated; pitting on scutum, epistome, hypostom, legs and palpi. Fangs of chelicerae stout, sharply pointed; dorso-apical tooth minute, very sherp, directed backwards, ventral tooth absent; maxillary setae plain. Palpi rounded; first and second palpal setae with a few barbs; on fourth segment three setae with a few barbs, appendiculum with four pectinate setae; palpal claw trifurcat. Scutum broader than long (mean L 39 μ; W 70 μ; pseudostigmata 39 μ apart), trapezoidal, anterior and lateral margins convex, posterior margin rather sharply concave in centre, corners somewhat angular anteriorly, rounded posteriorly; scutal setae five in number, strongly pectinate, anterior pair the longest, median anterior the shortest. Pseudostig-mata forward to mid-line betweeen scutal setae, small; pseudostig-matic organs capitate, flask-shaped, the stem moderately long, the enlarged head clothed in minute setules; ocular shield placed its own close to scutum, level with the pseudostigmata, anterior eye the larger. Body setae stout, strongly pilose to pectinate, eighty-four to eighty-six in number; on dorsum forty-four, arranged ap-proximately in row as follows: 12:8:8:6:8:2; on venter the anterior setae shorter and more strongly pectinate than the posterior. Fore-leg, mean L 256 μ; leg setae mainly pectinate or plumose, coxal setae single, strongly pectinate or plumose. Length 0.245 (unengorged) to 0.324 mm. (engorged); width 0.152 (unen-gorged) to 0.245 mm. (engorged).
Type host: Gallus gallus domesticus Briss. Localities: Formosa Hayashidamura, Horin, Yoshinomura, Karenko, Taito, Dakusui, Sozan, Chohokuto, Robai, Hokuto, Shirin, Taihoku, Shinten, Tai-heirin, Sekitei, Mokusaku, Seifuku, Shinchiku, Simpo, Kansai.). Type and nineteen paratypes in Taihoku Imperial University Mu-seum, Taihoku. Taiwan (Formosa).
Described from numerous specimens from the skin under the wings of the type host. Also found on Passer montanus tivanensis HARTERT, Taihoku, 4. iii. 26 (by the writer), Caprimulgus affinis monticola FRANKLIN, Corvus coronoides colonorum SWINHOE (Corvus macrorhynchus SEEBOHM of Dr. Hatori), Alcedo atthis japonica Bo-NAPARTE and Centropus bengalensis lignator SWINHOE (Centropus javanicus DUMONT of Dr. Hatori) (by Dr. J. Hatori).