50 CYRTIDAE OF NORTH AMERICA 



7. Second longitudinal vein obliterated 8 



Second longitudinal vein represented by a verj- distinct apical rudiment. 



bimaculata Loew 



8. Anterior cross-vein and end of third vein obsolete or entirely wanting 9 



Anterior cross-vein and end of third vein present 10 



9. Abdomen black, wings fuscous at base fumlpennls Westwood 



Abdomen more or less yellow; wings hyaline. . .ungulculata Westwood 



10. Abdomen with basal black fasciae on each segment, regular in outline. 



fasciata Wiedemann 

 Abdomen without regular basal fasciae on segments 11 



11. Veins,except first, with an obsolete appearance. . .obsoleta Van der Wulp 

 Veins black, or at least distinct 12 



12. Legs pale j^ellow, the abdomen with basal black spots on second, third and 



fourth segments convezus new species 



First and second segments black 13 



13. Praescutellar callosities blackish, genitalia blackish, wings infuscated. 



Eastern species nigrina Westwood 



Praescutellar callosities whitish, genitalia marked with yellow; wings 

 almost hyaline. Western species hubbardi new species 



Acrocera bimaculata (PL XI, fig. 32.) 

 Acrocera bimaculata Loew, Centuries, vi, p. 23. 



(Transl.) "Male and female. Pitch black, apex of abdomen with two 

 yellow spots, halteres reddish yellow. Wings evenly and slightly infuscated, 

 veins dark fuscous, second longitudinal, except on apical rudim.ent, entirely 

 lacking. Length d' 2i— 9 2| lines. Wings cf 21—9 3| lines. 



"Pitch black, covered with short subfuscous hair. Humeral callosities 

 mostly testaceous or fusco-testaceous, ante-scutellars sometimes margined 

 testaceous, frequently all one color. Abdomen swollen, near the apex and on 

 both sides with large transverse yellowish spots. Venter blackish, the separate 

 segments bordered whitish posteriorly. Legs pale testaceous, femora and 

 tibiae a large part yellow. Tegulae sordid whitish, margined fuscous. Halteres 

 pale golden yellow. Wings sUghtly and evenly infuscated, veins apparent, 

 dark fuscous, auxiliary, however, black; third longitudinal vein furcate and 

 cross-veins both complete, as in most of the other species. (D. C. Coll. O. S.) ." 



Easily recognized by the rudimentary second vein. The 

 abdominal markings are variable. From several specimens Mr. 

 C. W. Johnson gives the, length as four to six millimeters. One 

 specimen from Delaware Co., Pennsylvania (C. A. Voelker), had 

 two additional small spots on the posterior margin of the third 

 segment. A small male from South])ridge, Massachusetts 

 (S. W. Bromley), had a margin of yellow on the posterior angles 

 of the fourth segment only. The wings are light hyaline. 



