788 BOSTON JOURNAL 



tion of tte next segment. The color is a much deeper yellow 

 than that of fervida. 



2. B. EPHIPPIATUS. — Black ; pleura and base of the tergum 

 yellowish. 



Inhabits Mexico. 



Body black : pleura pale yellow : wings dusky, tinged with 

 violaceous : tergum pale yellow towards the base ; this color is 

 gradually narrowed behind and terminates on the third segment, 

 forming somewhat of a semioval, with its base to the thorax and 

 confluent with the color of the pleura. 



Length less than half an inch. 



3. B. TERNARIUS. — Ycllowish; thorax fasciate; tergum ful- 

 vous in the middle. 



Inhabits Indiana. 



Head black : thorax with dull yellowish hair, and a blackish 

 band on the middle : wings with a slight yellowish tinge , ner- 

 vures fuscous : tergum fulvous on the second and third segments; 

 first and fourth segments yellowish ; remaining segments black. 



Length % nearly three-fifths of an inch. 



TRIGONA Jurine, Latr. 



1. T. BiLiNEATA. — O Blackish ; antennas, beneath, labrum 

 and two lines on the nasus pale. 



Inhabits Mexico. 



Body piceous black ; flagellum of the antennae beneath, obsolete 

 narrow anterior orbits, two rather broad lines on the hypostoma, 

 labrum and mandibles somewhat pale : wings hyaline, slightly 

 tinged with fuliginous towards the base ; cubital cellules obso- 

 letely divided into three by two [415] hardly perceptible ner- 

 vures ; ultimate cellules hardly attaining to the tip of the wing ; 

 the second receiving the recurrent nervure : feet not diflFerent 

 in color from the body ; posterior tibioe with the ciliae of the 

 edge sparse. 



Length less than one-fourth of an inch. 



It is somewhat smaller, and less robust than the ruficrus Latr. 

 of which the posterior tibiae are densely ciliated. I am indebted 

 to Dr. Klug for a specimen of the rnficrus : and it is very difiFer- 

 ent from the amalthea and »pinipes Fabr. My specimens are 



[Vol. I. 



