298 E. T. CRESSON, JR. 



Paratypes. — Two specimens from the same locality, taken 

 in April and May. 



Three specimens examined. This may be the female of 

 the Mexican P. elegantulus of Williston, but hardly likely. 

 The antennae are not entirely black and are long acuminate, 

 and the abdomen is opake. 



20. P. mainensis n. sp. 



cf . Front and face silvery : occiput black or grayish tinged ; mouth 

 parts yellow. Antennae black, long acute, whitish apically (Fig. 6). 

 Mesonotum and scutellum subopake, brownish ; laterally, pleurae and 

 metanotum, especially the latter, cinereous. Scutellum with minute mar- 

 ginal bristles. Humeri black ; halteres yellow. Abdomen moderately 

 slender, widest at third segment ; first with two silvery white spots ; nar- 

 row lateral angles, and ventral margins of 2-4 cinereous ; base of first, 

 entire 2-3, broad of fourth, and narrow bases of fifth, opake-black ; 

 leaving apex of fourth and remainder of fifth polished ; the latter with 

 two small dorsal indentations, and twice as long as fourth ; first with 

 distinct lateral comb of black bristles. Hypopygium very small, more 

 opake, brownish tinged and cleft, Coxas and the distinctly marked 

 femoral rings black (Fig. 126), otherwise yellow; femora moderately 

 stout, distinctly spinose ; middle pair with posterior series of yellow 

 hairs; apical and basal post-tarsal joints in proportion 1:3; post-tibiae 

 with few long hairs on outer surface at middle. Wings grayish or 

 brownish (Fig. 150). Length, 4.4 mm. ; wings, 5.0-6.0 mm. 



9. Similar. Front entirely silvery ; antennae acuminate (Fig. 7), 

 yellow or brownish. Only the median portion of mesonotum brown; 

 scutellum with stronger marginal bristles. First and second segments 

 entirely, narrow apices, and broad lateral margins of 3 and 4 cinere- 

 ous ; otherwise 3 and 4 opake-black ; 5th and 6th shining. Ovipositor 

 short, yellow, unusually thickened at its articulation with the large 

 shining black globose base (Fig. 89). Femoral rings less distinct than 

 in male. Length, 4.0 mm. ; wings, 4.4 mm. 



Type.—&. Fort Kent, Maine, August 17, 1910 (Figs. 6, 

 126, 150, Johnson, B. S. N. H.). 



Pa? r atype. — One female (Figs. 7, 89, 151) from the same 

 locality. 



The peculiarly formed ovipositor which seems to be articu- 

 lated with its large globose base, and the entirely cinereous 

 first and second segments are very distinctive, as are also 

 the fine scutellar bristles. 



