T. D. A. COCKERELL. 165 



(b.) Stigma dark brown or black. 



i. Tegulfe testaceous ; metathoi-acic enck)sure truncate 

 behind, with a sharp rim. 



Halictus !«isinibrii Ckll. — Superficially this is very like forbesii and 

 bardus, but it is at ouce distinguished from both, not only by the tegulae, but by 

 the much more coarsely sculptured metathoracic enclosure ; the type specimen 

 was not at all characteristic, being largely denuded of its pubescence ; when in 

 good condition the insect lias four broad white hair-bands on the abdomen, one 

 at the middle of the first segment, the others at the bases of segments 2-4. In 

 one example (Ckll. 876) the dorsal pubescence of the thorax is quite dense and 

 fulvous, while the abdominal bauds are tinged with ochraceous and the second is 

 more produced downward at the sides; possibly this may represent a distinct 

 species, but the structural characters agree, and I believe we have to do with only 

 one variable species. 



Hub. — Mesilki Valley, New Mex., College Farm, on Si-^ymbriimi 

 April 16, 9 ; Little Mountain, on Streptanthus carinatas March 26, 

 1895, ? ; Las Cruces, June 9, 1894, 9 (Ckll. 876) ; College Farm, 

 on Melilotus indiea May 1, 1895, 9 . At Watrous, New Mex. 

 (6200 feet altitude), on July 13, I took a S , which appears to belong 

 to this species, differing only in the ordinary sexual characters. 



ii. Tegulffi black ; metathoracic enclosure semilunar. 



Haliotus angiistior n. sp. J .—Length 8.5 mm. Black, narrow in form, 

 looking rather like a "J, ; face narrow, clypeus produced, pubescence on face and 

 cheeks whitish, merely enough to give them a dusty appearance; margin of cly- 

 peus with long, pale, rufous hairs, mandibles rufescent at tips; antennse wholly 

 black, rather long, reaching as far as tegulae, first joint of flagellum longer than 

 second ; clypeus granular, with tolerably sparse punctures ; face and front rough 

 and dull, a group of shallow pits adjacent to orbit; pubescence of thorax tinged 

 with ochraceous, vei-y scanty, short, most noticeable on pleura and sides of meta- 

 thorax; postscutellum conspicuously tomentose; mesothorax dullish from a mi- 

 croscopical sculpturing, closely punctured, median and parapsidal grooves dis- 

 tinct; the sculpturing, viewed with a compound microscope, is seen to consist of 

 minute striee ; scutellum closely punctured, but tolerably shining ; enclosure of 

 metathorax semilunar, rather shiny, irregularly wrinkled or almost subcancellate 

 all over ; tegulse dark piceous, appearing black. Wings smoky hyaline, grayish, 

 not yellowish, iridescent; nervures and stigma piceous: inner spur of hind tibise 

 simple, outer spur with five teeth, the last two very minute. Abdomen compara- 

 tively long and narrow, shining, punctures minute and sometimes hardly visible ; 

 the second and following segments with a basal grayish white hair-band, nar- 

 rowed in the middle; the mandibles have a short denticle within; the tegulse 

 have a rufous spot. 



Hub. — Las Cruces, New Mex., two on a plant supposed to be 

 Flaveria, garden of my house, Aug. 25, '1895. 



In the shape of the head this reminds one of H. foxli Rob., but 

 that has testaceous tegulre and a honey-colored stigma. H. pedo- 

 rnloides has a shorter head, shiny mesothorax, and differently sculp- 

 tured metathorax. 



TRANS. A.yi. ENT. SOC. XXIV. JUNE. 1897 



