AMERICAN DIPTERA. 287 



small, much shorter than fifth, with a shallow apical cleft. Legs 

 black, grayish, with apices of femora, bases of tibiae, and tarsi, yel- 

 low ; flexor and inner surfaces of post-femora polished. Wings hyaline 

 with stigma twice the fourth section (Fig. 160). Length, 3.8 to 4.4 

 mm. ; wings, 5.3 to 5.6 mm. 



9 . Front and face silvery, former with a fine median black vitta 

 expanding into the shining vertex; antennae with third joint acute and 

 minutely spiniform apically. Mesonotum opake-brown, anteriorly 

 and laterally cinereous. Ovipositor long, straight and yellow. Simil- 

 lar to Fig. 54 but longer, extending to base of abdomen, abruptly ter- 

 minating its small shining black globose base,. Wings hyaline with 

 short stigma, only one-half as long as fourth section. Length, 4.2 mm. ; 

 wings, 4.5 mm. 



Type.—d 1 . Cloudcroft, New Mexico, June 18, 1902 (Fig. 

 160, Viereck, A. N. S.), No. 5024. 



Paralyses.— Same locality, 1 d\ 1 9 . Taken in May and 

 June. 



This species seems very close to loewii Kert., but the hypo- 

 pygium is cleft, and the stigma of male is distinctly longer 

 than fourth section. 

 8. P. nigripes Loew. 



This species was described from Pennsylvania, and also 

 reported from New Jersey (1899 Smith 665), and New 

 Hampshire (1902 Slosson 7). I have before me two males 

 from Lansdale, Pa., July (Figs. 4, 53, Cresson, A. N. S.) , 

 and Ithaca, N. Y. (Fig. 123, coll. Banks), which seem to 

 agree with Dr. Hough's description excepting in size, wherein 

 these specimens are much larger (4.4 to 4.8 mm., while Loew 

 gives the type as 1| lines or 2.5 mm.); these also have the 

 antennae acute, not short acuminate, as Dr. Hough gives it. 



cT. Entirely black, bare, only extreme bases of tibiae yellow. Front 

 brown ; face sericeous with brownish tinge ; occiput cinereous. An- 

 tennae acute (Fig. 4). Mesonotum and scutellum semi-shining, faintly 

 brownish. Pleurae and metanotum more or less cinereous. Abdomen 

 short conical, little longer than thorax ; margin of first segment silvery ; 

 following segments opake, nearly black basally, with the broad apices 

 of a black graphite appearance, tinged with gray in some aspects, but 

 ventral margins distinctly cinereous. Hypopygium more shining, 

 rather small (Fig. 53) , cleft ; only the terminal lobe visible from above. 

 Legs slender, post-tibiae gently arched, or in the specimen from 

 Ithaca, rather distinctly angular (Fig. 123); spines weak. Wings (Fig. 



TRANS. AM. ENT. SOC, XXXVI. DECEMBER, 1910. 



