No. 174.-,. AMERICAN BEES OF THE GENUS NOMIA—COCKERELL. 297 



is at once distinguished from X. melanderi and californica by the 

 strong relatively much denser puncturation of disk of mesothorax, 

 scutellum, and first abdominal segmenl : but in Nomia this may be 

 only a sexual character. In the color of the bands this agrees with 

 N. melanderi, but the tegulse are hyaline with a fulvous spot, whereas 

 in melanderi they are opaque black. From the locality, one would 

 associate it with X. californica, but the color of the bands is quite 

 different, and the first segmenl has no light band. The wings are 

 yellower than in melanderi or californica, and the apical margin is 

 paler. The face is rather narrow, and the orbits converge below. 

 The clypeus is shining and somewhat concave. 



Habitat Southern California, "through C. V. Riley." 



Type-specimen.— Cat. No. 12987, U.S.N. M. 



(B) Male antenna' elongate, slender apically, but the point obtuse. 

 Species of the West Indies. 



Nomia robinsoni Cresson. Cuba. 



X. wickJiamii Ashmead. Eleuthera, Bahamas. The type is before 

 me, collected by Henry Ditzen. It is evidently very close to N. 

 robinsoni, but easily distinguished by the much greater amount of 

 black on the tibiae. From Ashmead's description, T had difficulty in 

 separating this from N.foxii, but it is really quite distinct, differing 

 as follows: Hair of face yellowish; scape much larger and thicker; 

 flagellum much longer, more slender apically; mesothorax and first 

 abdominal segment more closely punctured; dorsum of thorax 

 appearing very black, fringed with pale yellowish hair; abdominal 

 bands paler, with turquoise tints; yellow lobe of hind tibia larger. 



(C) Male an tennse ordinary ; first abdominal segment with no green 

 or blue band. 



Nomia foxii Dalla Torre. New Mexico. 



N. mesillensis Cockerell. New Mexico. Only the female is known, 

 but T believe it falls in this group. 

 N. universitatis Cockerell. Colorado. 



NOMIA TETRAZONATA, new species. 



Noiiiin tetrazonata Ashmead MS. (No description.) 



Male. — Length about or hardly 10 mm., anterior wing 7J; the four 

 abdominal bands rather narrow, light turquoise blue, with slight green 

 tints. Very close to N.foxii and aniversitatis, but uniformly smaller- 

 Compared with N.foxii it is readily distinguished by the sculpture of 

 the abdomen. In foxii the third segment has rather small, irregularly 

 placed punctures of dill'erent sizes, while the fourth has very small 

 punctures. In tetrazonata the fourth has large regular punctures like 

 those on the third, while those on the fifth could not he called minute- 

 The second segment is depressed basally. The hind femora are con- 

 siderably stouter than in N. universitatis; the hind tibia' are unusually 



