3l6 NEW YORK STATE MUSEUM 



d Basal enlargement of the antennal segments with a length 

 about ^ greater than its diameter; the 4th palpal segment 



Yz longer than the 3d b a r I o w i n. sp., C. 798 



ccc Terminal clasp segment long, more or less flattened, not roundly 



swollen ; pulvilli absent 



d Basal enlargement of the antennal segment with a length 



fully twice its diameter ; the 4th palpal segment twice the 



length of the 3d, the base of the terminal clasp segment 



not greatly flattened and dilated cerasi Felt, C. 18 



dd Basal enlargement of the antennal segment probably with a 

 length not more than ^ greater than its diameter ; the 4th 

 palpal segment only J^ longer than the 3d ; terminal clasp 



segment broad at base, strongly flattened 



g i b b o s a Felt, C. 162 

 bbb Antennal segments with a smooth stem fully yi longer than the 

 basal enlargement ; males 

 c Terminal clasp segment stout, elongate, ovoid; palpi quadriar- 



ticulate modesta Felt, C. 147 



cc Terminal clasp segment stout, produced, not dilated ; palpi tri- 



articulate texana n. sp., C. 1258 



ccc Terminal clasp segment much produced; palpi quadriarticu- 



late t u c k e r i n. sp., C. 1259 



cccc Terminal clasp segment greatly dilated, subtriangular in out- 

 line dilatata Felt, C. 1109 



HETEROPEZINAE 

 This subfamily comprises a few peculiar forms. The metatarsus 

 is usually longer than the following segment and there are at most 

 three long veins. The ocelli are wanting and the second tarsal 

 segment is somewhat shorter than the first. The American repre- 

 sentatives of this group may be separated by the following table. 



Key to genera 



a Wing; membrane finely haired, the long veins simple 



b Tarsi quadriarticulate, the metatarsus longer than the second seg- 

 ment Miastor Mein. 



bb Tarsi biarticulate, the metatarsus shorter than the second segment... 



Oligarces Mein. 

 aa Wing; membrane thickly scaled 



b Three simple long veins, the tarsi 5 segmented. .. .Brachyneura Rond. 



Miastor Mein. 



But one American representative of this genus, M. a m e r i c a n a 

 Felt, is known. This species was taken at Highland, N. Y., on 

 either beech or chestnut leaves. 



