1896.] NATURAL SCIENCES OF PHILADELPHIA. 103 



Antenna3 blackish, a yellowish spot at base of scape beneath, and 

 flagellum yellowish below. Mouth-parts much elongated, glossa al- 

 most naked, or with the terminal half hairy. 



Thorax shining brassy-green, pubescent as in albipenms, and with 

 the yellow also more or less developed on collar and hind border of 

 prothorax, but not on tubercles, except in the form of a very small 

 spot, which may be absent. Metathorax dark green, sometimes a 

 little bluish. 



Legs dark, pubescent, the hairs on posterior tibiae especially long 

 and dense, as in albipennis ; tips of anterior femora, upper two- 

 thirds of anterior tibise in front, yellow. Tegulse yellowish-hyaline. 

 Stigma very pale yellowish, nervures almost colorless, the portion of 

 marginal cell beyond stigma conspicuously longer than that below 

 it; second submarginal narrowed about one-half to marginal, third 

 discoidal distinct. 



Abdomen above black, nearly naked, except the last segment, 

 Avhich is densely fringed with white hairs. Fourth segment with 

 two yellow spots, absent in specimens lacking the face-markings 

 (mut. nigrior). Pygidial area conspicuously rufous. Venter dark. 



Mut. 9 ) nigrior. — Stigma colorless, pale marks of head and 

 thorax absent, pubescence of mesothorax white instead of yellowisli, 

 vertex a slightly bluer green, metathorax tinged with blue above, 

 last joint of antennie with a slight hook, abdomen without yellow 

 spots. (Ckll., 4,908.) 



Mut. 9 , intermedia. — Stigma pale yellow ; vertex rather more 

 brassy, lateral pale marks of clypeus absent. Abdomen with seg- 

 ments 2-4 each with a pair of yellow marks, those on 2 and 3 trans- 

 versely elongate, those on 4 larger and rounder. First taken by C. 

 Rhodes on Verbesina. Sometimes the spots on segment 2 are lack- 

 ing. The lateral pale marks of clypeus may also be more or less 

 developed. 



$. — Head larger and broader, cheeks strongly bulging below 

 but not spined ; antenna? with the scape and funicle black above 

 and yellow beneath, flagellum orange with the first two joints black 

 or blackish above. Lower corners of face, and clypeus, yellow, the 

 clypeus with two longitudinal black marks, and a black dot on the 

 outside of each, after the manner of P. numerata. In some exam- 

 ples the clypeus is black with a median longitudinal yellow line, 

 and the lower corners broadly yellow, the yellow sometimes enclos- 

 ing a black spot near its upper limit. (Ckll., 4,906, 5,054.) Pro- 



