110 DIPTERA OP NORTH AMERICA. [PART III. 



caused by considerable sinuous expansion of the costal cell ; the 

 second longitudinal vein is very conspicuously arcuated ; the two 

 crossveins are rather approximated and perpendicular, the poste- 

 rior one somewhat curved ; the posterior angle of the discal cell 

 is acute. The coloring of the wings is blackish-brown, more 

 yellowish-brown near the root, grayish in the posterior angle ; on 

 the anterior margin there are two triangular hyaline spots, which 

 attain the third longitudinal vein more or less completely with 

 their very sharp points ; the first of these spots covers, near its 

 anterior end, the tip of the costal cell and the basis of the stigma, 

 while the second is immediately beyond the stigma; the dark 

 crossband between these two spots is tinged with brownish-yel- 

 low inside of the marginal cell, with the exception of a browm 

 border, which becomes narrower towards the first longitudinal 

 vein. The stigma, towards its end, gradually assumes the same 

 brownish-yellow coloring, so that the first hyaline spot has no 

 well-defined limit within it. Upon the middle of the wing there 

 are two hyaline drops, elongated in a direction perpendicular to 

 the axis of the wing; the one is in the discal cell, somewhat this 

 side of the small crossvein, the other in the first posterior cell, 

 over the posterior crossvein. On the posterior margin of the 

 wing, in the second posterior cell, there is a triangular spot, con- 

 cave towards the apex of the wing, convex on the other side, 

 which is near the posterior crossvein and separated by a narrow, 

 brownish border from it. The sharp point of this spot is directed 

 towards the dot in the first posterior cell, and is often connected 

 with it, while, in other specimens, it does not even reach the 

 fourth posterior vein. Near the basis of the wing there is a 

 narrow, oblique, hyaline streak, beginning in the first basal cell, 

 crossing the end of the second basal cell and entering the third 

 posterior cell ; here it runs along the sixth longitudinal vein and 

 thus reaches the margin of the wing, where it becomes a little 

 grayish. 



Hah. United States, common. 



Observation. — The description which Fabricius gives of his 

 Bluscapicta in the Hntomologia Systematica might suggest doubts 

 as to its identity with the above described species, doubts, how- 

 ever, which I hold to be without foundation. First of all, it is 

 certain that Wiedemann's Trypeta picta, is identical with our 

 species ; his description, as well as the types of his collection, 



