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



Type locality: Yalesville, where it was collected 19 October, 

 1903 (H. L. v.). Has also been taken in Cheshire, 8 July, 1904 

 (H. L. v.). 



M. hyphantriae Riley. 



Tips of hind tibiae dark ; propodeum blackish. 



This is a primary parasite of the white-marked tussock moth 

 (Hemerocampa leucostigma) , also parasitic on the fall web 

 worm. Occurs throughout the state from July to September in- 

 clusive (H. L. v.). (See Fig. 247, Smith's "Insects of New 

 Jersey"). 



°M. vulgaris (Cresson). 



Length 4 mm. ; propodeum and basal segment of abdomen 

 tinged with blackish, rest of abdomen brown ; thorax reddish ; 

 head and antennse brownish stramineous; legs stramineous; 

 wings clear. 



Recorded as a parasite on Omphalocera cariosa and Tetra- 

 lopha platanella. 



*M. exareolatus Viereck (new species). 



Male. Type locality: Rockville, taken 23 August, 1905 (H. 

 L. v.). 



°M. versicolor (Wesmael). 



Parasitic on the brown-tail moth (Euproctis chrysorrhcea) , 

 and has been imported from Europe into the State of Massa- 

 chusetts to combat this species. 



M. dimidiatus (Cresson). 



Head partly, thorax almost wholly black or blackish ; basal 

 and apical third of abdomen black or blackish; middle third of 

 abdomen and legs usually mostly stramineous. 



Specimens taken in Connecticut by the writer indicate that 

 this species occurs throughout the state from June to August in- 

 clusive. It is recorded as a parasite of Feltia suhgothica. 



Euphorus Nees. 



Key to Species. 



Length 3 mm; black; face dull, pubescent with silvery hairs; 

 clypeus and mandibles mostly reddish; greater part of 

 legs pale stramineous; wings clear; abdomen partly brown- 

 ish mellipes 



