AMERICAN DIPTERA. 297 



occiput very much swollen and puffed out (Fig. 124), entirely and 

 densely cinereous, Mesonotura and scutellum cinereous or brownish, 

 especially the former. Abdomen entirely cinereous with a median 

 brown stripe, or dorsum of segments 2-6 subshining, brownish tinged, 

 becoming opake at bases ; a lateral comb of white hairs on first ; sixth 

 longer than fifth. Ovipositor yellow, abruptly terminating and longer 

 than its black cinereous base, slightly curved down, extending to apex 

 of first segment (Fig, 56). Tibiae entirely yellow or annulated; femoral 

 spines distinct apically. Wings hyaline (Fig. 159). Length, 3.8 to 4.5 

 mm. ; wings, 5.0 to 5.6 mm. 



Type.—tf. Manchester, Vt., June 6, 1910 (Fig. 158. John- 

 son, B. S. N.H.). 



Para types. — Mt. Equinox, Vt., June (3 9 s, Figs. 56, 124, 

 159, Johnson, B. S. N. H.); Sea Cliff, Long Island (1 9, 

 coll. Banks). 



This species differs from eleganhdus Will., according to 

 the description, in having the antennae acuminate instead of 

 obtusely pointed ; the mesonotum is not distinctly pilose, in 

 fact, it has at most only very fine pubescence ; the third sec- 

 tion of fourth vein is not over twice as long as second. The 

 females may be distinguished at once, among those with 

 fourth vein appendiculated, by having the occiput unusually 

 swollen which gives the head a cubical appearance (Fig. 

 124). 



19. P. acuminatus n. sp. 



9 . Front silvery, shining black at vertex. Face silvery. Antennae 

 with second joint black, third yellow and long white acuminate (Fig. 

 26). Thorax entirely grayish pollinose, mesonotum less so in the mid- 

 dle, bare except for a few whitish hairs along lateral margins ; scutel- 

 lum convex, grayish, with minute whitish marginal hairs. Abdomen 

 opake, grayish pollinose with bases of 3-5 segments broadly brown, 

 which color extends more apically in the middle ; sixth segment more 

 shining. Ovipositor yellow, extending to apex of first ventral segment, 

 slightly curved downwards; its long conical base shining black (Fig. 

 77). Coxa? and femora black, grayish; all joints, tibiae excepting 

 the brown annuli, and all tarsi yellow ; fore femora with two series'of 

 about three, and the middle femora with about six minute black flexor 

 bristles ; hind femora with flexor series of about four bristles. Wings 

 hyaline (Fig. 155), with colored stigma. Length, 3.5-4.0 mm.; wings, 

 3.7-4.4 mm. 



Type.— Alamogordo, New Mexico, May 12, 1902 (Figs. 26, 

 77, 155, Viereck, A. N. S., No. 5025). 



TRANS. AM. ENT. SOC, XXXVI. (38) JANUARY, 1911. 



