74 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



and first posterior cells. This form, however, does not hold 

 constant in these characters, but intergrades nicely with some 

 specimens I have included in the typical series. In fact, some of 

 the males in the typical series have the finely reticulated wings of 

 this form, but the femora are not so noticeably darkened. How- 

 ever, I have two females from Capens, Maine, (C. W. Johnson), 

 [Boston], which have the finely reticulated wnngs, but one has 

 the femora darkened, while the other has them entirely pale. 

 It is noticeable, in all forms, as a rule, that the darker the legs, 

 the finer the reticulation, and that the females are always darker 

 than the males. 



Of this variet}^ I have selected five females from the following 

 localities: 



Maryland: Beltsville, June 18; Cabin John Bridge, July 29; Forest Glen, 

 May 30; Near Plummer's Island, July 4, (all W. L. McAtee), [all Biol. Surv.]. 



Nebraska: Fremont, [A. N. S. P.]. 



Euthycera arcuata variety uniformis new name 



1847. Tetanocera flavescens Loew, Stett. Ent. Zeit., viii, 123, (nee Desvoidy, 

 1830). 



This form I consider a variety of arcuata, differing essentially 

 only in the few characters mentioned below. That it is flavescens 

 of Loew may be questioned, but Loew's name must fall anyway. 



c?, 9 . Second antennal joint longer and somewhat broader than the third; 

 face retreating, but slightly concaved; spots in the marginal cell large, few, 

 generally quadrate, l)ut not equally spaced, seldom triangular; fore femora 

 entirely yellow; tibiae infuscated only at extreme apices. Length. — 7 to 

 8 mm. 



Specimens Examined.. — 3 cf,7 9. 



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



Maryland: Cabin John, July 29, (W. L. McAtee), [Biol. Surv.]. 



Virginia: Snicker's Gap, Bluemont, June 22, (A. Wetmore), [Biol. Surv.]. 



Euthycera borealis new species 



This form will need more study. It seems fairly well differ- 

 entiated from the others, and is probably strictly boreal in its 

 distribution. There is apparently nothing by which the indi- 

 viduals from New England may be separated from the North 

 Carolina series. 



cf , 9- Similar to uniformis but smaller, paler in color. Head more pro- 

 duced triangularly; second antennal joint not so long as third and narrower. 

 Wings longer in i)roportion to their width, and the spots in the marginal 



