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



P. alnicola Ashmead. 



Shining black. Head three and one-half times as wide as long. 

 Antennae dark brown, pedicel paler. Legs brown; the trochan- 

 ters, tips of tibise, and all tarsi pale. Second abdominal segment 

 striated at base. Length 1.2 mm. 



Has been reared from Cecidomyid galls in the flower buds 

 of the alder. 



P. tumidus Ashmead. 



Polished black. Head four times as wide as long. Antennae 

 brown black. Legs brownish piceous; trochanters, tips of an- 

 terior tibiae, and all tarsi paler. Second abdominal segment with 

 striae that extend to the middle. Length 1 mm. 



A parasite of Cecidomyia symmetrica, an oak gall. 



P. cynipicola Ashmead. 



Polished black. Head three and one-half times as wide as 

 long, the vertex very faintly aciculated. Antennae brown-black, 

 the pedicel as long as the second flagellar joint. Tegulae black; 

 legs black or brown-black. The foveolae at base of second 

 abdominal segment striated. Length 0.6-0.8 mm. 



P. rubi Ashmead. 



Black, polished. Head three times as wide as long, vertex not 

 at all aciculated. Antennae brown, scape and pedicel yellowish. 

 Abdomen polished, the base of the second segment striate. Length 

 1 mm. 



A parasite of Cecidomyia farinosa, occurring on blackberry. 



P. asynaptae Ashmead. 



Polished black. Head in female three and one-half times as 

 wide as long, in male only three times. Vertex not or very faintly 

 aciculated. Antennae black. Legs black or piceous; tips of an- 

 terior tibiae and anterior and mid tarsi brownish. Length 0.8-1.2 

 mm. 



Has been bred from galls of Asynapta sp. occurring on 

 willows. 



P. astericola Ashmead. 



Polished black. Head three times as wide as long, vertex not 

 or very faintly aciculated. Antennae dark brown. Legs, includ- 

 ing coxae, rufo-piceous ; trochanters, knees, tips of tibiae, and all 



