North American Hymenoptera. 213 



second cubital cellules confluent : tihi<Zy anterior pair 



dull pale yellowish. 



Lencrth three twentieths of an inch. 



2. A. celluldris. Black ; abdomen rufous. 



Inhabits Indiana. 



$ Body black, polished : antenncB distinctly and rather 



densely ciliated with hairs, which are a little shorter than 



the transverse diameter of the antennae: nasus, lahrum 



F 



and palpi whitish : ivings dusky violaceous ; cubital 

 ■cellules three ; the second very small, hardly one third 

 the length of the first, and but little wider at its tip than 

 at its base : ahdomen entirely yellowish-rufous : feety 



>/ 



>/ 



Leno-th less than one fourth of an mch. 

 Much smaller than Hylotoma ahdomtnaUsj Leach, 

 which it probably resembles. 



Genus Thulea, Say. 



ARTIFICIAL CHARACTER. 



Antennse six-jointed ; last joint clavate. Radial cel- 

 lule one. Cubital cellules three. 



NATURAL CHARACTEK. 



antennae 



joint very short, not longer than broad ; second joint at 

 least as long again as the first and somewhat more 

 robust, cylindrical ; third rather longer than the 1st and 

 2d together, much more slender, cylindric, hairy ; fourth 

 minute, shortest : fifth about the length of the tliird, sub- 



