PROC. ENT. SOC. WASH., VOL. 20, NO. 1, JAX., 1918 3 



Habits of Imagines. 



The imagines are rarely met with, but when they are it is 

 usually upon tree-trunks, particularly on dead or dying speci- 

 mens. Not uncommonly examples are found on windows in 

 houses. They feed upon nectar, decaying vegetable matter, or 

 sap exuding from trees. 



Key to Genera 



1. Eyes with short, upright hairs Acartophthalmus 



Eyes bare 2 



2. Cross veins of wings not closely approximated, the length of penul- 



timate section of fourth vein about one third that of ultimate 



( 'I nsia. 



Cross veins closely approximated, the length of penultimate sec- 

 tion of fourth vein less than one fourth that of ultimate 3 



3. Postvertical and cruciate bristles absent; ocellar bristles very 



small Chaetoclusia 



Postvertical bristles present; ocellar bristles distinct 4 



4. Cruciate frontal bristles present Clusiodes 



Cruciate frontal bristles absent Heteromeringia 



Genus Acartophthalmus Czerny 



This genus has not been recorded from North America. The 

 presence of very short, stiff upright hairs on the eyes sufficiently 

 distinguishes the genus from its allies. 



Acartophthalmus nigrinus Zetterstedt 

 Anthophilina nigrina Zetterstedt, Dipt. Scand., vol. 7, p. 2697, 1848. 



This is the only species of the genus. It occurs in continental 

 Europe, and is readily distinguished from its allies by its small 

 size, entirely black color, and waivy eyes. 



One specimen from the collection of Professor J. AI. Aldrich, 

 taken May 17, 1910, on Mt. Constitution, Washington. 



Genus Glusia Haliday. 

 Key to Species. 



1. Abdomen without conspicuous black spots on lateral margins of 



segments occidentalis. 



Abdomen with conspicuous shining black spots on lateral margins 



of segments 2 



2. Wing with 2 brown or blackish bands, one slightly beyond middle 



and the other at apex; male with bristles of antero- and postero- 

 ventral surfaces of fore femora subequal in length czernyi 



