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; antennae with a yellow annulus; 

 head and thorax maculated with yellow ; coxse 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 antennse, and thorax black, legs reddish except 

 trochanters, tibiae and tarsi hirtifrons 



^1 



