146 AMERICAN HYMENOPTERA. 



T. Towiisend). San Rafael and the vicinity is rich in Aiigoehlora 

 (seven species), in striking contrast with southern New Mexico, 

 where I find only one {A. piira Say). 



(5.) Agapostemon melliventris Cresson % .—Length 9 mm. Head 

 and thorax hrilliant green ; hind part of mesothorax and metathorax bluer than 

 scutellum and j)OStscutellum. Head like that of rar/m/fts in shapeand size; labrum, 

 mandibles, except tips, and broad anterior margin of clypeus sending a tongue 

 upward in the median line, lemon-yellow. Head and thorax thinly clothed with 

 yellowish white hairs, long and rather dense on cheeks below; inner orbits 

 roundly emarginate; antennje reaching to middle of metathorax: scape yellow, 

 with a small suifused dark spot at end above; funicle yellow below, black above I 

 flagellum pale brownish orange below, black above ; a black spot at base of each 

 antenna, and on each side of clypeus, as is also the case in radiatus ; mesothorax 

 coarsely and closely punctured, in fact subcancellate, the sculpture uniform, not 

 as in texmiHH : enclosure of metathorax rather strongly longitudinally wrinkled, 

 much as in radiatits ; tegulse hyaline, with a semilunar lemon-yellow spot. Wings 

 hyaline, nervures and stigma pale orange-brown, costal nervure black; stigma 

 larger than in radiatus. Legs (except coxfe) lemon-yellow, a dark brown spot on 

 distal end of hind femur. Abdomen lemon-yellow, with a narrow, black, sub- 

 apical band on each segment, somewhat broadened at the sides, but failing at 

 exteme sides, the part just behind it faintly orange tinged ; venter yellow, more 

 or less marked with brown. 



I had supposed this might he a new species, but on further con- 

 sideration I must agree with Mr. Fox, who regards it as the unde- 

 scrihed % of melliventria. My New Mexico records for melliventris 

 are as follows : 



Rincon, July 5, many males at flowers of mesquite ; one 9 at 

 rest on mesquite. Mesilla, July 23, 9 on Solamim elceagnifolium. 

 Mesilla, August 14, S on Solidago canadensbi ; also August 18, S 

 on Clematis ligusticifolia ; also August 23, on Bigelovla lorightii S . 



Las Cruces. October 1!>, S <jn garden Cosmos. Las Cruces, May 

 3, on Salix, 9. Little Mountain, March 2(5, 9 <>ii Streptanfhns 

 carinatus. College Farm, Mesilla Valley, April 12, on Sisymbriiun. 

 Las Cruces, September 22, % on Verbesina eneelioldes. 



Thus it flies all through the season and visits many kinds of 

 flowers. Prof. Tourney sent me a S from Tucson, Ariz., where it 

 was taken on flowers of Bigelovla hartwegi. 



(6.) Halictus arcutaus Rob., race arg-emonis n. race. 

 This may be distinguished as follows : 



