776 BOSTON JOURNAL 



variety? is destitute of the spot on the lab rum and has but a very 

 small spot on the nasus. 



The maxillary palpi sometimes appear to have six joints. 



1 am not sure that the male above described, is that of the 

 present species. 



STELIS Panz. 



S. OBESA. — Black, varied with yellow ; wings fuliginous. 



Inhabits Indiana. 



Body robust, convex, punctured, black : nasus, mandibles at 

 base, orbits anteriorly and abbreviated line behind, yellow : tho- 

 rax with a yellow, arcuated line each side extending on the ante- 

 rior margin : scutel somewhat indented [399] towards the tip, 

 margined behind with yellow, which is slightly interrupted in 

 the middle : wings fuliginous ; nervures fuscous : tergum, six 

 yellow bands, the anterior one widely interrupted, the others 

 gradually less so to the penultimate one which is confluent ; the 

 ultimate one broadest, entire : venter yellowish at base : feet yel- 

 lowish ; thighs and posterior face of the tibiae partly black. 



Length over one-fourth of an inch. 



In the abdominal markings it resembles some species of Anthi- 

 dium, but the maxillary palpi have two joints. 



OSMIA Panz. Latr. 



1. 0. LIGNARIA. — Dark bluish; thorax and base of the ter- 

 gum, with cinereous hair. 



Inhabits United States. 



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

 very profoundly emarginated : antennae black : thorax with cine- 

 reous hair ; wing-scale black-piceous : wings with a slight fuli- 

 ginous tinge, particularly on the costal half of the radial cellule ; 

 nervures blackish : tergum, basal segment with cinereous hair ; 

 remaining segments with short blackish hair ; anal segment 

 blackish : beneath 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 ; venter blackish ; 

 uasus very slightly and obtusely emarginate. 



[Vol. I. 



