294 E. T. CRESSON, JR. 



tarsi, blackish; femoral spines weak; post-tibiae slightly bowed; 

 apical and basal joints of post-tarsi in proportion 1:2. Wings grayish 

 with colored stigma (Fig. 153). Length, 3.0 mm; wings, 3.8 mm. 



9 . Front with upper half polished; abdomen nearly shining, with 

 the brown bases broader and less attenuating laterally ; the cinereous 

 apices narrower and less distinct in contrast, and limited mostly to the 

 lateral angles ; sixth segment nearly equalling fifth, with a shallow 

 longitudinal groove, entirely brownish-gray ; base of ovipositor brown- 

 ish, subquadrate, as long as sixth segment ; ovipositor yellow, very 

 short, abruptly terminating and hardly as long as its base (Fig. 91). 



Type.—&. North Haven, Conn., August 3, 1905 (Fig. 28, 

 90, 153, Viereck, B. S. N. //.). 



Paratypes. — Auburndale, Mass. (Id 1 , 19 , Fig. 29, Johnso?i, 

 B. S. N. H.); Lenola, N.J. (1 d", coll. Johnson); German- 

 town, Pa. (2 cfs, Harbeck, coll. Johnson); Ithaca, N. Y. (1 9 , 

 Fig. 91, Barlow, coll. Johnson); Falls Church, Va. (1 cf , coll. 

 Banks); Black Mountain, N. C. (1 9, coll. Banks). Taken 

 May to August. 



These vary but little in size, coloration, and abdominal 

 markings ; the hypopygium is sometimes more developed 

 and showing some lateral compression, with the cleft decid- 

 edly to the right. The small ovipositor, cleft hypopygium, 

 yellow humeri, legs and antennas, as well as its small size, 

 will easily distinguish this species. It is somewhat more 

 shining than affinis. A male from Ashland Junction, Me. 

 [Johnson, B. S. N. H.), and another from Riverton, N. J. 

 (Fig. 154, coll. Johnson), are larger and the hypopygium 

 more developed, also the femora of the former are darker. 

 These may belong to a distinct species. 



16. P. atlanticus Hough. 



d? . Front and face silvery ; occiput white. Antennae yellow-brown 

 or black, with silvery tinge, acute; arista black (Fig. 11). Mouth 

 parts brown or yellow. Mesonotum brown pollinose, margins, pleurae 

 and metanotum, cinereous. Scutellum subopake, brownish; humeri 

 and halteres brown or black with pedicles of latter yellow. Abdomen 

 broad, parallel sided, all segments subequal ; subopake to nearly shin- 

 ing with apical margin of first, ventral margins and the interrupted 

 medianly apical margins of following segments, cinereous. Hypopy- 

 gium larger than fifth, subopake, brownish and grayish ; basal lobe 

 sometimes narrowly visible ; lateral and intermediate lobes distinct, 

 the latter visible from above; terminal lobe with shallow cleft, which 



