E. T. CRESSON, JR. 61 



and broad as long, to rectalinear, much longer than broad. Third 

 joint bluntly to sharply pointed. The infuscation of the costa 

 may be entirely reduced (triangularis); the reduction beginning 

 in the stigma and marginal cell. The varieties noted are briefly 

 diagnosed below, but there seems to be much intergradation 

 between them. More exhaustive study, with large series of speci- 

 mens from all possible localities, may throw some light upon the 

 limits of this species. 



Chaetomacera elata variety rotundicornis Loew 



1861. Tetanoccra rotundicornis Loew, Berl. Ent. Zeit., v, 344. (Cent, i, 70.) 

 I have a few specimens which may be located under this name. 



They could be confused with unicolor, but the antennae are more 

 like elata, and the mesonotum faintly vittate. They differ from 

 elata in having only the apical portion of the costa infuscated. 



Originally described from both sexes from English River, 

 Canada, (Kennicott). I have examined a male from Glen House, 

 New Hampshire, July 8, 1914, (C. W. Johnson), [B. S. N. H.]; 

 also a pair from Connecticut, (Williston), 



Chaetomacera elata tj^ical form 



Second antennal joint hardly longer than broad, rarely broader; third, 

 bluntly pointed apically, but not broadly so; arista scarcely more densely 

 phunose basally than beyond, with extreme base pale. Antennal orbital spot 

 absent or pale brown, rarely darker. The median polished stripe narrowed 

 anteriorly and rarely attaining margin except in the female. Lateral margins 

 of mesonotum at most slightly shining. Wings with costal margin entirely 

 infuscated, with sometimes faint streaks between the veins. 



Specimens Examined. — 8 cf , 6 9 ■ 



New Hampshire: Wliite Mountains, (C. U. Lot. 3.5, Cornell U. Lot. 60, 



Sub. 193), [Cornell]. 



Vermont: Burlington, June 24, (C. W. Johnson), [B. S. N. H.]. 



Connecticut: (WiUiston), [A. N. S. P.]. 



New York: Ithaca, June to August, [Cornell]. 



District of Columbia: Chain Bridge, June 12, (W. L. McAtee), [Biol. 

 Surv.]. 



Chaetomacera elata variety plebeia Loew (PL I, fig. 3; pi. II, fig. 31.) 



1862. Tctanocera pkbeia Loew, Mon. Dipt. N. Am., i, 120. 



Probably inseparable from typical elata, but considering the 

 more densely plumose arista as described by Loew, we may retain 

 the name for those specimens possessing this character. The 

 series examined show some deviation from the original descrip- 



TRANS. AM. ENT. SOC, XLVI. 



