AMERICAN DIPTERA. 301 



22. P. fllSCUS Loew. 



This species I do not know. It seems to be, in every re- 

 spect, similar to cingulatus Lw., except in the coloration of 

 the tibiae, which in this species are yellow, at most only dis- 

 colored with faint brown rings. If this is the only character 

 of differentiation, it seems probable that it is synonymous ; but 

 more material is needed for study to ascertain this. If such 

 synonymy is established, then the form here described, being 

 distinctly different in other respects from cingulatus Lw., 

 may be a new or extreme form. 



d 71 . Front, face and occiput white. Antenna? acute, brown; arista 

 black (Fig. 33). Mesonotum subopake, densely brown pollinose, with 

 whitish pubescence. Scutellum shining black ; pleura and metanotum 

 cinereous; humeri, and halteres yellow. Abdomen subcylindrical, 

 nearly as long as head and thorax together, shining black, but not 

 noticeably bronze tinged, first segment cinereous apically, bases of 

 following segments narrowly velvety black, lateral apical angles of 

 segments 2-5 cinereous, and a faint median transverse brownish-gray 

 fascia on segments 2-3; segments 1-4 subequal in length, 5th longer, 

 subquadrate, with two dorsal indentations; hypopygium subopake, 

 brownish, much developed, extending to apex of third ventral segment, 

 assymetrical (Fig. 75), strongly compressed to right, with distinct cleft, 

 which becomes an opake circular area above ; a sharp vertical keel pro- 

 trudes from apex ; intermediate and ventral lobes small, black; entire 

 abdomen sparsely clothed with yellow pile. Legs yellow, coxae, 

 femora, excepting bases and apices, black ; tibia? with faint brownish 

 median rings ; all femora very stout apically, with usual flexor spines ; 

 post-tibia? strongly bent. Wings (Fig. 156) brownish, highly iri- 

 descent. Length, 5.0 mm. ; wings; 6.25 mm. 



Lehigh Gap, Pa., VI. 25 '01. {Coll. C. IV. Johnson.) 

 It will be noticed that the grays and yellows are more pro- 

 nounced in this form than in those placed under cingulatus 

 Lw. 



Dr. Hough ( 1899 Hough 78) suspects that reipubliccs Walker, 

 is the same as this species, and I cannot do better than treat 

 it as such in this paper. 



23. P. viduus n. sp. 



cf. In general appearance similar to femoratus. Front, face and 

 occiput white. Palpi, proboscis and antennae (Fig. 8) black or 

 brown, latter acute. Thorax subshining; mesonotum brown pollinose, 

 white pilose; lateral margins, pleura? and metanotum, cinereous. 



TRANS. AM. ENT. SOC, XXXVI. JANUARY, 1911 



