Abstract
There were two remarkable types, A and B, of D. auraria, differing in several morphological and oecological characteristics. They also differ in their habitate. Collections and observations were made in an attempt to learn the difference of their habitats between these two types, in Shioya-Mura, near Otaru City, during a period from July to August, 1952. The field of observations ranges in altitude from 30 to 300 meters. The traps, baited with banana or other fermenting fruit, was set at ten places, at an interval of 30m. high, two traps in each place.
It was found that the flies of the A-type were abundant around the places of low altitude, and tended to decrease in number with elevation, while an inverse relation occurred in those of the B-type. They were abundantly obtained around the places of high altitude, 90 to 120 m, high.
Remarkable is that in the population of the B-type the limitation in distribution of the female is rather distinct as compared with that of the male.
