568 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



2. Antennae, except club, reddish virginica 



Antennae entirely piceous or black 3 



3. Legs entirely reddish yellow haematobiae 



Legs rufous; coxae, femora, and tibiae fuscous minutissima 



°P. minutissima Ashmead. 



Polished black. Antennae piceous, with rufous scape. Coxae, 

 clavate part of femora, and tibiae piceous. Wings hyaline, the 

 stigma piceous. Length 0.9 mm. 



°P. hasmatobiae Ashmead. 



Shining black. Antennae piceous, with rufous scape. Legs 

 uniformly reddish yellow. Cheeks each with a tuft of grayish 

 woolly pubescence. Length 0.8 mm. 



Parasitic on the horn-fly (Hcematobia serrata). 



°P. virginica Ashmead. 



Polished black, impunctate. Antennae, except club, and legs 

 reddish yellow or yellowish. Cheeks behind, collar, and petiole 

 woolly. Metathorax pubescent. Wings hyaline, fringed; the 

 stigma long, brownish. Head thick, globose. Length i.i mm. 



°P. schwartzii Ashmead. 



Polished black. Antennae, except club, and legs reddish yel- 

 low or yellowish; club fuscous. Wings hyaline, the stigma yel- 

 lowish. Length 1-1.2 mm. 



Basalys Westwood. 

 °B. fuscipennis Ashmead. 



Polished black. Cheeks and collar with dense gray wool. 

 Antennae, legs, and petiole brownish yellow. Wings fuscous, 

 marginal vein piceous, with a cloud below its tip. Length 2.7 

 mm. 



BELYTID^. 



Head transverse or subglobose, with the 14- or 15-jointed 



antennae inserted on a frontal prominence. Wings with a closed 



costal cell, basal cell, and usually a marginal cell. Hind wings 



always with a basal cell. Abdomen petiolate. Wingless forms 



rare. 



Key to Genera. 



Females, 



I. Antennae is-jointed • 2 



Antennae 14-jointed Ancctata p. 573 



