320 E. T. CRESSON, JR. 



long, curved, subapical process below (Fig. 125), and post-tarsi 

 strongly flattened and dilated, wider than the tibiae. Wings hyaline 

 (similar to Fig. 168), without colored stigma. Length and wings 2.3- 

 3.2 mm. 



9 . Similar. Front depressed and wider than face, narrowed towards 

 antennae, where only it is silvery. Abdomen shining black. Ovipositor 

 rather abruptly tapering from its globose base, very slender and ex- 

 tending to third segment (Fig. 118). Only extreme apices of femora 

 and bases of tibiae yellow ; tarsi somewhat brownish ; post-tarsi dilated ; 

 fore and middle femora with two hairs below near bases, but no ap- 

 pendages on posterior legs. Wings short and obtuse, hyaline. Length 

 and wings 3.2-3.5 mm. 



Type.—c?. Summerville, S. C, July 2, '06 (Figs. 36, 117, 

 125, Cresson, A. N. S., No. 5032). 



Paratypes. — Manchester, Vt. (19, Johnson, B. S. N. H.); 

 Sea Cliff, Long Island (1 c?\ coll. Banks); Falls Church, Va. 

 (1 c?,coll. Banks); Black Mountain, N. C. (1 9 , Fig. 118, 

 coll. Banks). Taken May to September. 



These two females do not agree in every respect, but I 

 cannot separate them satisfactorily. The one from Man- 

 chester has darker legs which are more cinereous, and tarsi 

 are less dilated than in the other. 



52. P. birtens n. sp. 



cf. Front dark golden; face silvery. Antennae brownish, acute 

 and spiniform apically (similar to Fig. 36). Mesonotum and scutellum 

 shining greenish-black ; humeri and halteres yellow ; pleurae and meta- 

 notum very faintly grayish. Abdomen entirely shining or slightly 

 obscured, greenish-black ; first segment with lateral series of white 

 bristles; fifth narrowed apically, but not shorter ventrally than dor- 

 sally; hypopygium similar to subvirescetis, assymetrical, shorter than 

 fifth and cleft to right (Fig. 115). Legs black, but knees, bases of 

 tibiae, and tarsi yellow ; femora semi-shining, with flexor series of 

 bristles minute, hind trochanters each with two straight filiform ap- 

 pendages below, one each near base and apex (Fig. 129); hind tarsi 

 only slightly if at all dilated. Wings grayish-hyaline, without stigma 

 (Fig. 168). Length, 2.8 mm. ; wings, 2.3-2.5 mm. 



Type.— Yosemite Valley, Cala,, May 22, '08 (Figs, 115, 

 129, 168, Cresson, A. N. S., No. 5031). 



Paratypes. — Berkeley Hill, Cala., 2 ; Yosemite Valley, 

 Cala., 1, all by Cresson, A. N. S. Taken April and May. 



This species is easily distinguished by the two filiform 

 appendages on the hind trochanters. 



