540 CONNECTICUT GEOL* AND NAT. HIST. SURVEY. [Bull. 



Originally bred from a Cecidomyid gall on willow at Los 

 Angeles, Cal., but occurs abundantly in the New England states, 



°P. diplosidis Ashmead. 



Polished black. Vertex less strongly aciculated than in the 

 preceding. Antennae brown-black. Tegulae black; legs brown- 

 black, the base of the tibiae and tarsi paler. 



Has been bred from a Cecidomyid living on pine. 



°P. solidaginis Ashmead. 



Polished black. Vertex strongly striated. Antennae brown, 

 the scape often black. Tegulae piceous or black. Legs, including 

 coxae, variable, from pale rufous to rufo-piceous. Striae on 

 second abdominal segment extending to the middle. Length 

 I-I.6 mm. 



Has been reared from galls on goldenrod. 

 °P. euurae Ashmead, 



Polished black. Head two and one-half times as wide as long. 

 Antennae brownish black. Tegulae rufous. Legs, including coxae, 

 dark rufous. Pedicel as long as the second flagellar joint. Length 

 1.6 mm. 



Has been reared from Cecidomyid inquilines in the gall of 

 the sawfly Euura nodus. 



Platygaster Latreille, • 



Key to Species. 



1. Legs, except coxae, yellow or golden yellow ,, caryae 



Legs piceous or rufo-piceous 2 



2. Head punctate, face more finely so herrickii 



Face highly polished, with transverse striae above antennae aphidis 



°P. caryae Ashmead. 



Shining black. Vertex rugose, the face finely, closely punc- 

 tate. Antennae yellow with fuscous club in female, light brown in 

 male, Tegulae piceous. Length 1.5-2 mm. 



A parasite of a Cecidomyid forming galls on hickory trees. 

 °P. herrickii Packard. 



Black, shining, finely punctate or microscopically shagreened. 

 Antennae black. Legs black or rufo-piceous ; sometimes the bases 

 of tibiae and of tarsi yellowish. 



