North American Hymenoptera. 



399 



dented towards the tip, margined behind with yellow, 

 which is slightly interrupted in the middle : wings fuligi- 

 nous ; nervures fuscous : iergum^ six yellow bands, the 

 anterior one widely interrupted, the others gradually less 

 so to the penultimate one which is confluent ; the ulti- 

 mate one broadest, entire : ve^iter yellowish at base : feet 

 yellowish ; thighs and posterior face of the tibiae partly 



black. 



r 



Length over one fourth of an inch. 

 - In the abdominal markings it resembles some species 

 of Anthidium, but the maxillary palpi have two joints. 



1. 



OsMiA, Panz. Latr. , 

 Dark bluish ; thorax and base of the 



* -s. r 



tergimi, with cinereous hair. 

 Inhab. United States. 

 . 9 Body very dark bluish : head with cinereous hair : 

 nasus very profoundly emarginated : aniennce black : 

 thorax with cinereous hair ; wing-scale black-piceous : 

 wings with a slight fuhginous tinge, particularly on the 

 costal half of the radial cellule ; nervures blackish : 

 terguniy basal segment with cinereous hair ; remaining 

 segments with short blackish hair ; anal segment blackish : 

 lath a little darker than above : feet and ventral hair 



blackish. 



Length about nine twentieths of an inch. 



$ Hair of the head before dense, rather longer, and 

 whitish ; pectus, pleura and feet with cinereous hair ; 



k 



ginate 



Length about seven twentieths of an inch. 



A conunon species ; nidificates in old wood. Fornix a 



.f 



