No. 22.] HYMENOPTERA OF CONNECTICUT. 299 



Euceros Gravenhorst. 



Eumesius Westwood. 



Key to Species. 



1. Hind tibiae reddish, sometimes yellow at base; hind tarsi uni- 



colorus ; wings faintly dusky at tips 2 



Hind tibiae black or dusky, yellow at base; coxae black to 

 yellow; abdomen varied with black and yellow, and always 

 with a more or less distinct median longitudinal yellow 

 stripe; stigma reddish; hind coxae and scutel at base mostly 

 black. Length of body ii mm. (female and male) . . .canadensis 



2. Sternum reddish and concolorous with rest of thorax 3 



Sternum lemon-yellow; thorax above black and yellow; 



mostly yellow. Length 9 mm. (male) .thoracicus 



3. Abdomen fulvous, with more or less distinct transverse yel- 



low spots; thoracic vittae yellow; mostly rufo-ferruginous 

 with yellow markings. Length 9-10 mm. (female) . .medialis 

 Abdomen and thorax uniformly pale fulvous; mostly pale 

 dull yellow or yellowish red without distinct yellow mark- 

 ings (female and male) flavescens 



*E. thoracicus Cresson. 



Type locality: Connecticut. 

 *E. flavescens Cresson. 

 °E. medialis Cresson. 

 °E. canadensis Cresson. 



Eczetesis Foerster. 



°E. paniscoides Ashmead. 



Female: length 8-10 mm.; mostly honey-yellow, with the 

 abdomen darker toward the apex; face, prothorax, and tarsi 

 paler ; areolet triangular, subpetiolate ; ovipositor exserted. 



Sympherta Foerster. 



Key to Species. 



Female and male: length 8 mm.; head and thorax mostly 

 black; abdomen mostly reddish; nervellus branched below 

 middle burra 



Female: length 7 mm.; body almost entirely pale brownish 

 yellow; nervellus branched above middle unicolor 



*S. burra (Cresson). 



°S. (subgenus?) unicolor (Cresson). 



