AMERICAN DIPTERA. 315 



43. P. similis Hough. 



o". Similar to subvirescens Lw. Shining black with greenish tinge. 

 Front and face silvery ; lower occiput and faint posterior pleural spots, 

 cinereous. Antenna? black or brown (Fig. 35), more or less sericeous. 

 Abdomen long and narrow (Fig. 108), sides subparallel ; fifth segment 

 about one and a half as long as fourth ; with two dorsal indentations ; 

 clothed with. scattered, erect, black, bristle-like hairs, which are also 

 more or less scattered over the other segments, but longest on the lateral 

 margins; lateral comb of first black and small. Hypopygium nearly 

 as long as fifth, assymetrical and cleft, with intermediate and ventral 

 lobes visible from above ; the whole organ often so extended as to 

 show the basal membranes. Legs simple, with femoral spines very 

 weak; knees, bases and apices of tibiae and tarsi, yellow. Wings 

 hyaline (Fig. 171). Length and wings 2.8-3.4 mm. 



9 . Similar. Front broader than face, depressed and shining above. 

 Abdomen more ovate and robust ; segments 2-5 somewhat constricted 

 at incisures ; very sparsely hairy; first slightly hoary; fifth equalling 

 fourth, but sixth slightly longer. Ovipositor slender, extending to base 

 of abdomen (Figs. 109-110), rather abruptly thickened basally, and 

 articulated with the large retracted, subglobose base. Fore and mid- 

 dle femora, and post-trochanters, each with two minute spines at base 

 below, but stronger on fore femora (these are rather difficult to see). 

 Length and wings 2.5-2.8 mm. 



Described from Georgia cT, and Alabama 9 ; also reported 

 from New Jersey (1899 Smith 665). Before me is a series 

 from which the above description was based ; I am not cer- 

 tain they belong to this species, but they agree more with 

 the typical description than any others I have. They are 

 from: Montreal Island, Quebec (1 c?\ Fig. 108, coll. John- 

 son); Sea Cliff, Long Island (1 cf, coll. Banks); Swarthmore, 

 Pa. (2 cfs, Figs. 35, 171; 2 9 s, Figs. 109-110, Cresson, A. 

 N. S.). 



The long narrow abdomen of the male and the broader 

 transversely constricted abdomen of the females are the most 

 noticeable characters. Of course the females of this group 

 are difficult to separate readily without comparison, and those 

 placed under scoparius may belong here. The similarity of 

 habitats were the only causes for placing them as I did. 



44. P. COquilletti Kertz. 



c?. Third joint of antennas brownish, long silvery acuminate ; meso- 

 notum faintly brown pollinose, with yellow humeri and scutellum 

 shining ; abdomen at most grayish pollinose laterally ; hypopygium 



TRANS. AM. ENT. SOC, XXXVI. (*40) JANUARY, 1911. 



