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The Tohoku Earthquake that occurred on March 11th 2011 caused a giant tsunami across the Pacific coast of the Tohoku and Kanto regions. The damages wrought by the Tohoku earthquake and tsunami has also affected the natural environment. I have been studying the distribution of Sesiidae in coastal areas of Miyagi-ken since before the earthquake. After the earthquake, the author hasvisited various sites to investigate the effects of the giant tsunami on Nokona regalis (Butler). The sites investigated are the following: cliffs of Minamisanriku-cho Togura through Shizukawa Hayashi, which form a rias coastline in the northern area of Miyagi-ken; black pine forests facing the sandy beaches of Iwanuma-shi Oshiwake Sukahara; and the residential areas and agricultural areas of Watari-cho Arahama, which is located close to the coast of the southern area of Miyagi-ken. Furthermore, Sendai-shi Miyagino-ku Okada through Wakabayashiku Ido, which is located in central area of Miyagi-ken, has been included as an investigation site due to its similarity with the sites in Iwanuma-shi. The investigation was conducted in December 2010 before the earthquake, as well as from June 2011 through March 2013. The investigation was held mainly from fall to winter, by examining galls formed on Vitis ficifolia, on which thlarvae feeds. Investigations using pheromone traps were also conducted in Iwanuma-shi during mating seasons of imagines. As a result of my investigation, distribution of Nokona regalis was confirmed in sites in Minami Sanriku-cho, Iwanuma-shi, Watari-cho, and Sendai-shi, and it was inferred that distribution was widespread in the coastal areas of Miyagi-ken. In investigations after the earthquake, however, inhabitation of this species could not be confirmed in Iwanuma-shi and atari-cho. The effect of a tsunami on the ecosystem varies greatly according to the topography of the location as well as the role of manmade influences. In this investigation, the following were confirmedas threats posed by the tsunami on this species. 1.Destruction of habitats due to the tsunami 2.Disappearance or decrease in food-plants due to salt damage 3.Destruction of habitats due to reconstruction projects

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In the alpine zone of Mt. Norikura, 22 families and 168 species of Lepidoptera were recorded on July 17-19, 2010 and August 4-6, 2011. Investigations using route census were performed for 5 days at 3 areas from Kikyougahara (altitude 2702 m) to Oonyuike (altitude 2342 m), to Gonoike (altitude 2720 m) and to Hirayu route (altitude 2600 m) . Investigations using the light traps were performed at the same place at Kikyougahara for 3 days. The ratio of the number of diurnal alpine species to the total number of species recorded on the mountain was 15.38 and 27.27 in 2010 and 2011, respectively. The ratio of the total number of diurnal alpine species individuals to the total number of species individuals on the mountain was 4.17 and 43.70 in 2010 and 2011, respectively. The ratio of the number of nocturnal alpine species to the total number of species recorded on the mountain was 7.14 and 10.45 in 2010 and 2011, respectively. The ratio of the total number of nocturnal alpine species individuals to the total number of species individuals on the mountain was 3.17 and 13.43 in 2010 and 2011, respectively. The habits of some species were investigated. Many individuals of Nemophora ochsenheimerella (= N. japanaloina) were observed flying over Pinus pumila. Six individuals of Papestra biren and Cucullia lucifuga flew into the light trap. The biology of some species was studied in this investigation, such as the sucking behavior of Clepsis monticolana Kawabe and Sympistis heliophila (Paykull). The larvae of Dysstroma citratum nyiwonis (Matsumura) and Cucullia lucifuga (Denis & Schiffermuller) were collected from Artemisia unalaskensis. Females of Clepsis jinboi Kawabe laid eggs in a plastic vial and the hatched larvae fed safely on Artemisia indica. The larval and pupal stages of Clepsis jinboi were recorded for the first time.

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