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



Amitus Haldeman. 



°A. aleurodinis Haldeman. 



Polished black; legs most frequently brownish or pale rufous, 

 the coxse and femora sometimes dusky or blackish. Antennae in 

 female 8- jointed, brownish yellow, with an unjointed brown club ; 

 in male lo-jointed, with verticillate hairs. Length 0.75-1 mm. 



A parasite of various species of Aleyrodes. 



Trichasis Foerster. 



°T. rubicola Ashmead. 



Polished black, impunctate. Antennae pale brown, the scape 

 yellow. Thorax ovate, with distinct furrows. Legs yellowish; 

 the coxae black ; the posterior femora and tibiae dusky toward the 

 tips. Abdomen longer than the head and thorax together, pointed 

 at tip. Length 1.4-1.6 mm. 



Parasitic on Cecidomyids making galls on Vernonia novehora- 

 censis and on blackberry. 



°T. rufipes Ashmead. 



Black, shining, the thorax with a fine sparse pubescence. 

 Antennae brown-black, the scape rufous. Thorax elongate-ovate, 

 with distinct furrows. Legs yellowish red, the coxae black. 

 Length 2-2.5 "^"^- * ■ • 



Bred from acorns which probably contained Cecidomyid 

 larvae. 



Eritrissomerus Ashmead. 



°E. cecidomyiae Ashmead. 



Black, subopaque, finely sculptured. Antennae brown-black, 

 except base and apex of scape. Thorax with two distinct fur- 

 rows. Scutellum convex and margined at the sides, closely punc- 

 tate. Legs blackish, lighter in the male, as are also the antennae. 

 Length 2.1 mm. 



Parasitic in a Cecidomyid gall on hickory. 



Polymecus Foerster. 

 Key to Species. 



1. Thorax smooth, impunctate 2 



Thorax finely microscopically punctate or shagreened 3 



2. Coxae and legs yellow auripes 



CoxjE black, legs varied with dark alnicola 



