J. CHESTKK BRADLKY. 141 



Middle coxse rather close together; posterior coxii' snbapproxiniate ; the 

 longer spur of the posterior tibite less than one-third the length of the metatar- 

 sus; the latter longer than the rest of the tarsus together; claws large, about 

 two-thirds as long as the fourth tarsal joint, toothed, the rays rather stout, 

 nearly at right angles, the outer one slightly larger (Fig. 45, there is some varia- 

 tion in the size of the inner tooth in the paratypes, but the angle seems con- 

 stant). Wings hyaline, or slightly clouded in the apical third ; the veins dark 

 in the basal part, becoming pale beyond the stigma; E:j obtusely curved beyond 

 E4 ; free part of R4 wanting; free part of Mj and Mif., pale, their base wanting 

 (Fig. 77) ; hind wings with an open costal margin. 



Abdomen of the male long, narrow, oblong or oval, almost linear; petiole more 

 than one-third its length, striate; the segments smooth, polished, second to sev- 

 enth inclusive exposed. Abdomen of the female subtriangulai-, with the apical 

 angle angle slightly produced into a short process containing the ovipositor; 

 petiole one-half the length of the abdomen, longitudinally striate; the segments 

 smooth, polished ; the second almost twice as broad as the third ; the second, 

 third, fourth and fifth segments fully exposed, the latter broadly emarginate 

 dorsally, exposing a part of the sixth and seventh segments, which form the 

 process already described ; edges of the last two segments and apex of the ovi- 

 positor finely ciliate. Length 7 mm. 



This pretty silvery shining species is very different in appear- 

 ance and characters from E. appendig aster, or any others that 1 

 know. The most obvious characters are the striation of the face 

 and the narrow abdomen of the males, but there are many other 

 important differences. In all I have seen over eight males and 

 .seven females. 



Five of the males were collected by Mr. AVitmer Stone on the 

 windows of his house in Philadelphia. As all the other specimens 

 have also been taken in large cities, I have applied to it the name 

 nrbana. Mr. Liebeck sends me five more specimens taken on the 

 windows of a house in Philadelphia. It is of course possil)le that 

 it may represent another exotic species, migrating similarly to E. 

 appendig aster. The front legs and antennse are sometimes_ more or 

 less pale. 



Hab. — Philadelphia, Pa., August 5th (Mr. Stone) ; Washington, 

 D. C, July 20, 1*)()0 ; New York and Brooklyn, N. Y. (Messrs. 

 Daecke, Brues and Franck). 



Types. — Type $ in the collection of the American Entomological 

 Society. Type 9 in the author's collection. Three paratypes (■?> ) 

 in the collection of the American Entomological Society. Two 

 paratypes (S) in the collection of U. S. Nat. Mus. Paratypes 

 in the Amer. Mus. Nat. Hist. 



TRANS. AM. KNT. SOC. XX XIV. APKII.. 1908. 



