AMERICAN HYMENOPTERA. 



105 



Sah. — Nevada, California, (H. Edwards, Behrens). Ten specimens. 

 This little species is very brilliant, but variable in color, some speci- 

 mens beino; entirely blue, purple or green, as the case may be, and 

 some partake of all three colors. 



Osmia coloradensis.— 9-— Black, tinged with blue; head and thorax 

 densely and strongly punctured, rather thickly clothed with pale pubes- 

 cence; head subquadrate, clypeus subcarinate down the middle, the apical 

 margin coarsely crenulated ; mandibles broad; tegulae piceous; wings dusky; 

 legs slender, black, with short pale pubescence; abdomen strongly tinged with 

 blue, shining, finely punctured, base of first segment with long pale hairs, 

 lateral and apical margins of all the segments with short pale pubescence; 

 ventral scopa white or yellow. Length .35 inch. 



Hah. — Colorado, (Ridings, Morrison). Six specimens. 



Osmia georgica.— 9 .—Black, tinged with blue ; head and thorax closely 

 and strongly punctured, face and sides of thorax rather thickly clothed with 

 pale pubescence; clypeus with a prominent central longitudinal carina, pro- 

 duced at apex in form of a tooth; mandibles broad, with a patch of yel- 

 low hair near tip, and a large transverse process at base above; mesothorax 

 thinly pubescent, disk sparsely punctured; tegulse piceous; legs slender, black, 

 with pale glittering hairs, yellow on inside of tibise and tarsi; abdomen shining, 

 finely not closely punctured, with a thin whitish pubescence at base and sides; 

 ventral scopa yellowish. Length .35 inch. 



Hah. — Georgia, (Morrison). One specimen. The formation of the 

 mandibles resembles that of mandihidaris, described above, but the 

 basal process is much smaller and when closed forms an arch, inter- 

 rupted medially, in front of the clypeus. 



Osinia azteca.— 9 •— Black, closely punctured, entire insect thickly 

 clothed with golden fulvous pubescence, darker on abdomen above and pale 

 on face, sides of thorax and legs; head subquadrate; tegulse piceous; wings 

 uniformly fuscous; the pubescence on abdomen is dense on apical margin 

 of the segments, especially on the terminal segments; ventral scopa yellow. 

 Length .35 inch. 



Hah. — Mexico, (Sumichrast). One specimen. 



Osmia abnormis.— 'J, .—Black, tinged with blue or green; head and 

 thorax densely and finely punctured, opaque, thickly clothed with a long 

 ochraceous pubescence, that on clypeus very dense 

 and pale; antennae black, reaching to scutellura, 

 apical joint compressed, broadly rounded at tip; 

 tegulfe piceous; wings dusky on apical margin; 

 legs black, clothed with black pubescence, except 

 on^anterior pair and tip of middle femora where it 

 is pale; the posterior femora short, swollen, sub- 

 globose, (as in fig. 3) the tibise short and incras- 

 sate ; intermediate tarsi (fig. 1) with basal joint 

 J. Z 3 4 dilated, lobed at tip before and fringed behind 



with long black hairs, second and third joints short and broadly dilated, 



TRANS. AMER. ENT. SOC. VII. (14) MARCH, 187S. 



