tsilopa. 143 



dull brassy ; proboscis and legs black, hind tarsi brown ; wings grayish- 

 glassy. Long. corp. 0.1. Long. al. 0.13. 



Shining black. Head proportionately broad, shining black ; 

 above the antennae with a small, dilated spot dusted with whitish. 

 Face broad, shining black, viewed laterally, more brownish-black; 

 viewed from above it appears as if dusted with white. Anten- 

 nas deep black ; antennal bristle with long pectinations. Probos- 

 cis and palpi perfectly black. Thorax shining black, scoriaceous 

 posteriorly; immediately before and on the flat scutellum the color 

 is more of a dull brassy green. Abdomen shining black, slightly 

 dusted. Legs black; the posterior tarsi appear rather dark brown 

 to the naked eye, viewed through a lens their color is almost dull 

 whitish, the dark appearance being caused by the black hair. 

 Poisers white. Wings grayish glassy; the second segment of the 

 costal vein is not half as long again as the third. 



Hah. Xew York. (Schaum.) 



3. P. atra Loew. % . — Atra, nitida, proboscide balterumque capitulo 

 albidis, basi tarsorum posticorum rufa, alis hyalinis. 



Shining black, proboscis and knob of the halteres whitish ; base of the 

 posterior tarsi red ; wings glassy. Long. corp. 0.12. Long. al. 0.16. 



Shining black ; head broad, front shining black ; the small 

 white-dusted spot above the antenna? and the whitish, exceedingly 

 fine dust of the broad, shining black face are scarcely perceptible. 

 Proboscis yellowish-white. The palpi seem to be black. Antennae 

 black ; the bristle with very long pectinations. Abdomen shining, 

 scarcely with a trace of dust, rather narrow and flat, apparently 

 consisting of four segments, the first being very much shortened ; 

 even the sixth, however, is perceptible. Legs black ; middle and 

 hind tarsi red at the base. Ilalteres with blackish petiole and 

 white knob. Wings glassy, slightly grayish; the second segment 

 of the costal vein not quite half as long again as the third. 



Hah. Middle States. (Osten-Sacken.) 



4. P. iiBisbiosa Loew. £. — Nigra, fronte, thoracis dorso et scutello 

 polline brunneo-cinereo tectis, facie griseo-pollinosa, antennis tarsorum- 

 que basi ex rufo flavis, alis adversus marginem anteriorem nigricantibus, 

 halterum capitulo albo. 



Black; front, upper side of the thorax and scutellum dusted with ashy- 

 gray with a fuscous tinge, face dusted with whitish-gray ; antennae and 



