254 DIPTERA OF NORTH AMERICA. [PART IV.. 



surface of the antennae become short and indistinct towards its 

 end ; besides the spines there is a microscopic pubescence on the 

 same side of the antennae ; antennae of the female hardly reaching 

 beyond the root of the wings ; no spines, but hairs ; two basal 

 joints and base of the third yellowish ; third joint as long as the 

 two first taken together ; the fourth less than half so long as the 

 third ; the fifth a little longer than the fourth ; the following three 

 joints are of about the same length ; the ninth is a little longer 

 and the tenth a little shorter than the preceding ones. Thorax 

 gray ; a long straight pubescence on the sides in the male, no 

 such pubescence in the female ; three blackish stripes on the 

 mesonotum ; intermediate stripe cuneiform ; the la.teral ones 

 abbreviated before and extended beyond the suture behind ; the 

 lower portion of the pleurae hoary ; scutellum and metathorax 

 gray ; halteres pale ; coxae gray, trochanters and femora tawny, 

 except the tip of the latter, which is brown ; tibiae and tarsi dark 

 brown. Abdomen grayish-black ; forceps of the same color ; ovi- 

 positor of the female very short ; its structure like that of Aniso- 

 mera; upper valves blunt, much smaller than the lower ones. 

 Wings slightly tinged with brownish ; veins, but especially the 

 praefurca, the central cross-veins, and the fifth longitudinal vein 

 faintly clouded with brown ; the second submarginal cell a little 

 longer, the first distinctly shorter than the first posterior cell ; 

 four posterior cells ; stigma brown. 



Hab. Trenton Falls, N. Y. ; Maine (Packard) ; Illinois (Kenni- 

 cott) ; Massachusetts (Packard). Three males and two females. 

 One of the males has the front and middle femora about half so 

 long as the hind ones ; another specimen, however (from Massa- 

 chusetts), has the front femora at least two-thirds the length of 

 the hind ones ; the middle femora are a little shorter. The latter 

 specimen, moreover, has a brownish abdomen, with distinct 

 yellowish lateral margins, and a dark tawny forceps (it resembles 

 the abdomen of E. spinosa) ; the thoracic stripe is not attenuated 

 posteriorly; the frontal bump is smaller, etc. I am not sure 

 whether it is a difiTerent species or not. The third male specimen, 

 as well as the females, have their feet broken off, which prevents 

 me from making any general statement about the relative length 

 of the femora in this species. 



