366 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [rolY. 



the margins of the two basal seg-ments fringed with short pale pubes- 

 cence, fourth segment sometimes of a deeper blue than the preceding 

 segments 5 venter piceous, sometimes with a blue tinge, the margins of 

 the segments testaceous. 



(?, Length 9"°™ to 10"™. Blue-green, face golden-green, apical seg- 

 ments of the abdomen darker and with a beautiful violet reflection, 

 venter blue. Tegulse with a smooth black spot; metathorax more closely 

 punctured; legs green, with a thin, pale pubescence; tarsi dark piceous. 



Some male specimens have the first recurrent nervure received within 

 the third submarginal cell. The same variation occurs in the females of 

 Angoclilora pura (Say). 



Allied to A.fervida Smith. Differs from all species known to me in 

 the very prominent angles of the prothoras, the sharp ridge connecting 

 these angles with the tubercles being sinuous. The Texan species which 

 has been mistaken for A. lucidula Smith agrees in most respects with 

 A. Jmmeralis, but the angles of the prothorax are not so sharj). The 

 species may vary in this character. Angoclilora hicidida Smith, occurring 

 in Connecticut, has the abdomen more sparsely punctured, is smaller, 

 and is the female of A. viridula Smith. 



40. ISToMiA NORTONi Crcss., ^ . 



Syn. Nomia Cressoni Westw., Tr, Ent. Soc. Loud. 1875, p. 218, pi. v, fig. 3. 



On the posterior tibiae I can discover only tivo spines, the usual number 

 in Hymenoptera, although Mr. Cresson, in the description of the species, 

 states that there are "three." The chitinous ridge connecting one of 

 the spines with the base of the tarsus may have been mistaken for the 

 third. Between the spines there is an oval transparent spot. The error 

 in regard to the spines misled Westwood, and caused him to give a new 

 name to the species. The broad plates on the venter belong to the third 

 and fourth segments, and not to the "second and third," as stated by 

 both Cresson and Westwood. 



41. Halictus occidentalis Cress., $ 9 . 



42. Calliopsis coloeadensis Cress., 5 . 



43. EPEOLUS OCCIDENTALIS Crcss., <? 9 . 



The seventh ventral segment of the male, retracted in most specimens, 

 is slightly emarginate at the ajjex and armed with a tooth on each side 

 at the base. Small specimens (male and female, length 9'"™) have the 

 legs more or less black. 



44. NoMADA TEXANA Cress., <? . 



45. Anthophora . 



9 , Length IS""; breadth of abdomen 0.3'"™. Black; the head, thorax, 

 and basal segment of the abdomen clothed with dense pale pubescence, 



