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



at base, as is also the base of the tarsi, posterior femora with a 

 tooth beneath . near apex ; abdomen smooth, poHshed, green to 

 brilliant blue or purple in certain lights, ovipositor rather longer 

 than the abdomen. 



Bred from the nest of Ceratina dupla. 



Oligosthenus Foerster. 

 °0. stigma Fabricius. 



Female : length 4.5 mm. ; mostly black, only slightly shining 

 metallic, punctate and rugnlose; mandibles, tibiae and tarsi more 

 or less yellowish; wings mostly hyaline, with a rounded cloud 

 near the stigmal vein and in addition a weaker cloud in the middle 

 of the wing, which latter is connected with the former by a weak 

 shadow-Hke infuscation; abdomen compressed from side to side, 

 ovipositor much longer than the abdomen, and yellowish. Male: 

 much like the female. 



Bred from the cosmopolitan rose gall-fly (Rhodites rosce). 



Monodontomerus Westwood. 



M. aereus Walker. 



Female : length 2.5-3.3 mm. ; dark green, often with more or 

 less coppery color; tibiae reddish-brown, tarsi yellow; the row 

 of pits at the margin of the scutellum complete, and as distinct 

 medially as laterally; ovipositor about two-thirds as long as the 

 abdomen ; propodeum medially carinate, and basally on each side 

 of the carina a quadrangular depression; back of these usually 

 another smaller depression. Male: essentially as in the female'. 



A parasite of the brown-tail moth, introduced into Massachu- 

 setts from Europe in 1906, and now widely distributed. Re- 

 covered at Putnam, 191 1, and at Hartford and Suffield, 1915. 



Syntoniaspis Foerster.* 



S. lazulella Ashmead. 



Female: length 2.6 mm.; mostly blue, with close punctures; 

 antennae black, face with slight metallic tingeings ; pleurae also 

 with slight metallic tingeings, collar and mesonotum transversely 

 scratched in addition to being punctate; anterior tibiae and all 

 tarsi, except apical joints, pale yellowish white, tibiae usually 

 with a blue streak above, mid and posterior tibiae, except narrowly 



* See Callimome for species sometimes referred to this genus. 



