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, polished, 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 rugulose; 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-like 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, 191 5. 



Syntomaspis Foerster.* 



S. lazulella Ashmead. 



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

 antennae black, face with slight metallic tingeisgs ; 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 



* Soe Callimome for species sometimes referred to this ijenus. 



