200 



Psyche 



[December 



similarly marked, except that the spots are quadrate and 

 very narrowly separated at the posterior margin; fourth seg- 

 ment largely yellow, with a dorsal triangle and small triangles 

 at the anterior angles, black; venter black, wath narrow white 

 posterior margins on all the segments. Legs a very light 

 yellow, last joint of the tarsi and the claw black, halteres yellow. 

 Length, 4.5 mm. 



Fig.l 



Fig. 2 



Fig. 3 



Fig. 4 



A second specimen collected by Stanley W. Bromley, at South- 

 bridge, Mass., has dark yellow markings, the two ^vddely separated 

 spots on the second segment are quadrate, those on the third 

 triangular and narrowly connected, and those on the fourth quad- 

 rate and also narrowly connected at the posterior margin. The 

 wings and squamae are a slightly darker hyaline than the Maine 

 specimen. It is also more robust but measures about the same 

 in length owing to a slight contraction of the abdomen. 



A third specimen in the Museum of Comparative Zoologj^ from 

 Maine (Osten Sacken), has the markings on the abdomen reduced 

 in size, those on the second segment consisting of two small spots, 

 while those on the third are somewhat larger and widely separated. 



Acrocera bimaciilata Loew. Figure 2. 



This species is most readily recognized by its rudimentary second 

 longitudinal vein, as the markings on the abdomen are somewhat 

 variable. A specimen from Levis Co., Quebec (G. Chagnon), 

 agrees with the type in having two large maculations on the 

 posterior margin of the fourth segment. A specimen collected by 

 Mr. C. A. Voelker at Clifton, Delaware Co., Pa., has two additional 



