148 JOURNAL. OF ENTOMOLOGY AND ZOOLOGY 



caudal end, etc. These differences are pointed out in the following 

 key: 



Larv.^l 

 1. Size smaller (fully grown, length, 14-15 mm.) ; mandible with 

 the largest of the two teeth at mid-length, slender, rather 

 sharply pointed; labrum with the lateral lobes produced 

 cephalad and proximad, almost touching one another on the 

 middle line; stigmal field with the dark markings pale, brown, 

 those of the ventral lobes not enclosing an ov^al pale area at 

 their proximal ends. Hexatoma megacera O. S. 



Size larger (fully grown, length, 18-26 mm.) ; mandible with 

 the largest of the two teeth at mid-length stout, blunt; labrum 

 with the lateral lobes produced cephalad and scarcely proxi- 

 mad, widely separated from one another; stigmal field with 

 the ciark markings black or very dark brown, those of the 

 ventral lobes contiguous at their inner ends and there enclos- 

 ing an oval pale area. Eriocera fiiltonensis Alex. 



1. Size small (length under 10 mm.) ; scapal spine larger; no pro- 

 jection on the mesonotal praescutum. 



Hexatoma megacera O. S. 

 Size larger (length over 12 mm.) ; scapal spine small; a small 

 projection on the mesonotal praescutum. 



Eriocera longicoruis Walk. 



ERIOCERA Macquart 



The information that was available concerning the species of this 

 genus was included in a paper by Alexander and Lloyd cited before 

 (Journal of Entomology and Zoology, VI, March, 1914), but since 

 that article was written a few more items concerning the biology of 

 members of this genus have been ascertained. 



Eriocera brachycera Osten Sacken. 



Eriocera braclixcera Osten Sacken; Bull. U. S. Geol. Surv., Ill, 

 205, 1877. 



This species is one of the rarer forms in the Eastern United 

 States. A pair that was collected by the author on i\ugust 4, 1914, 



