01 



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



M. (Mesostenidea) thoracica (Cresson). 



M. (Polycyrtus) albomaculata (Cresson). 

 °M, Candida (Cresson). 

 'M. fortis (Cresson). 



Possibly the female of Candida. 

 'M. exapta (Cresson), 

 'M. americana (Cresson). 



'M. (Christolia) arvalis (Cresson). 

 Parasitic on Polistes pallipes var. variatus. 



Acroricnus Ratzeburg. 

 Osprynchotus Kriechbaumer, not Spinola. Linoceras Taschen- 

 berg. 



°A. junceus (Cresson). 



Length 12 mm. ; blackish ; antennas with a yellow annulus ; 

 head and thorax maculated with yellow ; coxae black, marked with 

 yellow, rest of fore and mid legs practically uniformly yellow ; 

 hind legs, with the trochanters and femora, mostly black, their 

 tibiae and tarsi mostly yellow ; exserted portion of ovipositor 

 somewhat less than half the length of the abdomen. 



Reared from a nest of Odynerus tigris by V. A. E. Daecke. 



Joppidium Walsh. 



*J. peregrinus (Cresson). Mesoleptus ? peregrinus Cresson. 



Length 7 mm. ; mostly black ; thorax partly reddish, wings 



hyaline, fore and mid legs mostly whitish, hind legs mostly 



brownish, their coxae in the female reddish stramineous, in the 



male whitish. 



Type locality of male : Connecticut. 



Agrothereutes Foerster. 



Cryptus Fabricius (preoccupied). 

 Key to Species. 



1. Scutel more or less pale; abdomen above entirely black; or 



black and some other color, or reddish 2 



Scutel black; abdomen more or less red above 10 



2. Abdomen above reddish or black with an apical yellow spot 3 

 Abdomen above more or less red and black 4 



3. Abdomen above mostly reddish rufus 



Abdomen above mostly black with a bluish tinge; head, in- 

 cluding antennae, and thorax black, legs reddish except 

 trochanters, tibiae and tarsi hirtifrons 



