335 



The present paper deals only with the early stages and additional data 

 bearing upon the occurrence of Illinois species. 



SUBFAMILY CHARACTERS 



Larva and Puparium. — Very similar in general appearance to the 

 larvae of Geosarginae ; but all species that I have seen, differ in hav- 

 ing no distinct color-markings on dorsum, the body being uni- 

 formly testaceous or brownish. The head is also noticeably more 

 elongated and the body narrower in comparison with its length. The 

 armature of the body varies throughout the subfamily, but the bristles 

 are always conspicuous — though sometimes of unequal length — the 

 surface is shagreened as in other subfamilies, and there are no evi- 

 dent decumbent hairs. The apical segment is similar to that of 

 Geosarginae. The lateral abdominal spiracles are very small, or in- 

 distinguishable. 



Key to Genera 

 larvae and puparia 



1. Abdominal bristles very long, those on lateral margins, and on pos- 



terior margin of apical segment particularly so, the latter of uni- 

 form length and as long as or nearly as long as width of seg- 

 ment 2 



— Abdominal bristles short, those on margin of apical segment not 



more than half as long as width of segment, some of them very 

 short NeopacJiygaster. 



2. Outer bristle of each transverse series on dorsal abdominal seg- 



ments minute, not more than a sixth as long as next bristle, the 

 latter very much longer than inner pair Eupachygaster. 



— Outer bristle of each transverse series on dorsal abdominal segments 



about half as long as next bristle, the latter not very much longer 

 than inner pair Zabrachia. 



Neopachygaster Austen 



I have before me a large series of larvae and empty puparia of 

 maculicorms Hine, the only species in North America so far assigned 

 to this genus. 



GENERIC CHARACTERS 



Larva and Puparium. — Head very much longer than its greatest 

 width, much tapered anteriorly ; antennae very short ; surface hairs 

 long. Body narrower than in Zabrachia and EupacJiyijastcr, the 

 bristles comparatively shorter. 



