On new Bees from New Mexico, U.S.A. 63 
XI.—New Bees of the Genus Halictus from New Mexico, 
U.S.A. By T. D. A. CocKERELL, Entomologist of the 
New Mexico (U.8.A.) Agricultural Experiment Station. 
(1) Halictus tripartitus, sp. n. 
?. Long. 6 millim.; head, seen from in front, somewhat 
broader than long, black, with a perceptible greenish tinge ; 
face and cheeks thinly clothed with pale hairs; mandibles and 
antenne piceous, the latter, straightened, reaching about to 
anterior border of scutellum, with the head thrown back. 
Punctuation of face strong and very close. 
Clypeus pitch-black, lacking the greenish tinge of face, 
with large, rather sparse punctures, its anterior margin with a 
shining fringe of very pale golden hairs. 
Thorax broadly oval; mesothorax, pleura, and metathorax 
blue-black ; scuteilum and péstscutellum dark greenish, con- 
trasting. Hairs on dorsum of thorax ochraceous, those on 
pleura whitish. Enclosed portion of metathorax rugulose, 
finely longitudinally wrinkled at sides. 
Legs dark, with moderately dense pale pubescence, which 
has a golden tinge in some lights, on tibie and tarsi. 
Wings hyaline, nervures and stigma honey-yellow ; third 
submarginal narrowed more than one-half towards marginal. 
Abdomen black, shiny, densely punctate; segments 1 to 4 
with marginal bands of pale ochreous hairs, that on first 
segment failing in the middle. 
fab. Santa Fé, N.M., June 27, 1894, from alfalfa in 
Mr. Andrews’s orchard (Ckll. 1140). 
Very near to H. fasciatus, but that species differs in its 
green (not black) mesothorax, somewhat larger size, and in 
its head being slightly longer than broad, whereas in tripar- 
titus it is shghtly broader than long. AH. tr¢zonatus, Cr., is 
another allied species ; I have a specimen from Sta. Fé which 
may be referable to tr¢zonatus or may be a new species closely 
allied to it. It differs from tripartitus by its short third sub- 
marginal cell and black face and scutellum. 
(2) Halictus sisymbrit, sp. n. 
9. Long. about 9 millim.; black, with sparse whitish 
pubescence. Head broad; ocelli shining pinkish brown ; 
tace densely punctured; clypeus nearly bare. Mesothorax 
finely and closely punctured, shiny. Enclosed portion of 
metathorax longitudinally wrinkled. Sides of metathorax 
