210 CALIFORNIA ACADEMY OF SCIENCES [Pkoc. 4th Set 



52. Psychoda cinerea Banks 

 Common at Hood River and Forest Grove in late Decem- 

 ber and January. On rainy days many could be found under 

 old sheds or in protected places on the bark of trees; females 

 were observed about excrement. 



53. Psychoda schizura Kincaid 

 Hood River, VII-9 (Cole). 



54. Psychoda sigma Kincaid 

 Forest Grove, 111-28 and VI-3 (Cole). On the latter 

 date collected at light. 



55. Pericoma sitchana Kincaid 

 Hood River, VI- 19 (Cole). 



Family CHIRONOMID^E 



Fig. 4. Chironomus colei Malloch. 



This family, the midges, now includes two subfamilies, 

 the Tanypinae and Chironominae. They might be called "sun- 

 set-flies," often appearing in swarms at that time. Many 

 are seen in the air in the autumn, dancing in the sunshine, 

 usually near some body of water. They can be collected at 

 lights in large numbers. The adults resemble mosquitoes 

 superficially, but have poorly developed mouth parts and the 

 costa is not continued all the way around the wing. The 

 males, as in the Culicidae, have feathery antennae. Midges 

 usually alight with the fore legs in the air and mosquitoes 

 as a rule raise the hind legs. 



