54 CYRTIDAE OF NORTH AMERICA 



Posterior half of fourth segment yellow. Halteres yellow. Squamae whit- 

 ish hyaline. Legs pale yellowish. Base of venter pale brown. Female geni- 

 talia very prominent. Claws large and black. Wings hyaline, the venation 

 incomplete; second vein wanting. Anterior cross-vein (really a portion of 

 the fourth longitudinal) obsolete and also the end of the third longitudinal 

 vein. 



I have seen two female specimens from Enola, Pennsylvania 

 (W. R. Walton, VI, 13, 1909), and a specimen from Ft. Washing- 

 ton, Maryland (C. W. Johnson), in which the third segment has 

 a large yellow transverse spot on the posterior half, not reaching 

 the lateral margin. The fourth segment is yellow except a nar- 

 row anterior margin. The wings are whitish hyaline. A speci- 

 men five millimeters in length, from Lehigh Gap, Pennsylvania 

 (H. L. Viereck), in which the yellow on the abdomen covers all 

 the fourth, all but narrow anterior margin on third, and the pos- 

 terior dorsal fourth of the second segment, has brownish hyaline 

 wings. A female specimen from Austin, Texas (Col. A. L. 

 Melander), has the yellow of the abdomen confined to a large 

 spot on each side of the second, third and part of fourth segment. 

 This specimen, which appears to be immature, is about 2.5 mm. 

 in length. 



Acrocera bulla (PI. IX, fig. 27.) 



Acrocera bulla Westwood, Trans. Ent. Soc. London, v., p. 98, (1848). 



d^ . Thorax black, with short grayish white hair as on the abdomen. Short 

 gray hair on the occiput. Scutellum black; praescutellar callosities whitish 

 yellow, the humeral callosities yellow. Markings of abdomen somewhat 

 varied. Pleura black; venter blackish-brown; the segments with yellow bor- 

 ders. Male genitalia rounded and quite prominent. Legs whitish-yellow. 

 Venation typical. Length, 3.5 to 4.5 mm. Type described from Georgia. 



Specimens from Franconia, New Hampshire (Coll. Mrs. 

 Slosson); Williams, Arizona, June 7 (H. Barber coll.); Medicine 

 Hat, Alberta, Canada, October, 1911 (J. R. Malloch coll.); 

 Stanford University, California (H. Morrison coll.). Two small 

 specimens from Los Angeles, California (Coquillett coll.), may 

 be a variety. They are not much over two millimeters in length, 

 and the abdomen is almost wholly yellow. 



I have taken it for granted that Westwood's species has 

 typical venation. One from Bailey's Island, Maine, August 20, 

 1915 (Dr. G. M. Allen), has very light yellow markings, those on 

 the second segment consisting of two widely separated triangular 

 spots on the posterior margin; the third segment .similarly 



