THE CANADIAN ENTOMOLOGIST. 65 



NEW FORMS OF OSMIA FROM NEW MEXICO. 



BY T. D. A. COCKERELL, MESILLA, N. M. 



Osmia priinorum, n. sp. 



$ . — Length, 9 mm.; shining dark greenish-blue, densely punctured 

 with pale ochreous pubescence. Head subquadrate, face and front so 

 densely punctured as to be cancellate; pubescence thin except on occiput ; 

 clypeus punctured just like the front, with no central keel, the anterior 

 margin broadly dark purple, the edge straight and entire, two converging 

 brushes of orange hair projecting from beneath it. Mandibles with the 

 two lower teeth long and pointed. Antenntu rather short, flagellum only 

 feebly brownish beneath. Thorax very closely punctured, not very 

 densely hairy ; basal triangle of metathorax minutely granular, its extreme 

 base minutely longitudinally plicate. Tegulce black, shining, sparsely 

 punctured. Wings hyaline, faintly dusky beyond the nervures, nervures 

 black. Legs black, with pale brownish or grayish pubescence, rufescent 

 on inner sides of basal joints of tarsi ; hind femora quite broad at ends, 

 basal joint of hind tarsi quite stout. Abdomen short, suboval, convex, 

 shining, strongly but not very closely punctured, first joint covered with 

 sparse long pale ochreous pubescence ; remaining joints with a sericeous 

 pile, only noticeable in certain lights, when it will take more or less the 

 appearance of bands. Apex with snow-white hairs. Ventral scopa black 

 in middle and yellowish-white at sides. 



(^ . — A little larger ; face and clypeus densely covered with silky 

 white pubescence ; pubescence of thorax a deeper ochreous, especially on 

 scutellum. Antennie long, flagellum rufous beneath. Colour of head and 

 thorax a decided olive green. Wings not dusky beyond the nervures. 

 Pubescence of last four legs sparse and black. Middle tarsi ordinary. 

 Pile of second and third abdominal segments pale ochreous, that of the 

 following segments black except narrowly along hind margin of fourth. 

 Sixth segment with a shallow median depression ; its hind margin with a 

 very distinct rounded emargination. Apex with two long black spines. 



Hab. — Mesilla Valley, N. M.; 3 <?, i $ at flowers of plum. 

 College Farm, April 9 (Ckll.); 4 9 , i c? at flowers of Sisymbrium^ 

 College Farm, April 12th (Ckll.). Resembles O. distincta, but easily 

 known by the bicoloured ventral scopa. The $ seems to resemble that 

 of proxima, which I have not seen. This species is apparently referable 

 to the subgenus Chalcosmia, Schmeid. 



