K 



JSTorth American Hymenoptera. 413 



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j$ NasLis white. The tubercle of the liead is very 

 distinct. 



Common in the Union. The males may be distin- 

 guished by their larger and more approximate eyes and 

 white nasus. It varies in having the hair of the thorax 

 and of the first abdominal segmentj almost ferruginous. 



2. X. lateralis. Violaceous ; abdomen with a poste- 

 rior lateral cinereous spot- 



Inbab. Mexico. 



^ Body blackish-violaceous : head black : nasus and 



lahrum white : anteniKE with an anterior white line on the 



* 



radical joint : gence with a few gray hairs : wingSy first 



. recurrent nervure entering the third cellule within the 



distance of its own breadth from tbe nervure of intersec- 



tion of the third cellule : ahdomen^ each side near the 



tip with a cinereous spot of hair, extending upwards on 



each side of the venter, but .becoming obsolete towards 



the base. 

 'Length over seven tenths of an inch. 



BoMBUs, Latr. 



1. B- sonorus. Yellow; head, thoracic band and 

 abdomen behind black, 



Inhab. Mexico. 



Body yellow : head black : thorax with a broad black 

 band in the middle : wings violaceous-black : tergum with 

 the first, second and third segments yellow, the others 

 black : beneath black. 



Len^rth 9 four fifths of an inch. 



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