T. D. A. COCKERELL. 149 



punctures; base of metathorax nude, smooth and shining, not bounded by a 

 sharp edge; tegulre testaceous, pubescent. Wings hyaline; costa, stigma, and 

 nervures at base of wing (except the lilack costal nervure) yellowish ferruginous ; 

 the other nervures fuscous; the stigma varies to fuscous; second submarginal 

 cell narrowed somewhat more than half to marginal. Legs with whitish pubes- 

 cence. Abdomen flattened dorsally, minutely roughened, covered with a fine, 

 inconspicuous pale down ; hind iiiargins of segments with uniform bands of dense, 

 appressed, white pubescence, adjacent bases of following segments with similar, 

 but thinner and narrower bands, usually concealed by the retraction of the seg- 

 ments; apex with white hairs; venter almost entirely nude. 



% . — Length 8-9 mm. Pubescence of head and thorax longer and denser, that 

 on face dense and white; mandibles more slender, not notched near their rufous 

 tips, but some distance below : face wholly dark ; antennae somewhat longer, 

 flagellum only obscurely rufescent beneath, its second joint very short, not so 

 long as broad. Wings very slightly dusky toward apex ; tarsi all pale ferrugin- 

 ous; also the hind tibiae, except for a blackish subapical cloud in front; ven- 

 tral surface of abdomen more pubescent, dorsal surface not flattened. The hind 

 tibiae may be almost entirely blackish. 



ffab. — Las Cruces, New Mex. On flowers of Pedis papposa 

 Sept. 17, 1895, eight females and seven males. On Verbesina ence- 

 lioides September 11 and 12, four males. 



(10.) Paniirgiis olivife n. sp. 'J, .—Length 7-7.5 mra. Black, face wholly 

 black, mandibles black, flagellum dark rufous beneath. Legs, including tarsi, 

 black ; pubescence dull white, dense on face, pleura, and dorsum of thorax ; short 

 and appressed on legs, giving them a gray appearance. Head broad, face nar- 

 rowing below (as is also the case with the % of rhodoceratiis) ; eyes dark sage 

 green, vertex shining, second joint of flagellum broader than long; mesothorax 

 and scutellum with very minute, obscure punctures, and very sparse large ones; 

 base of metathorax shining; tegulae piceous, pubescent. Wings smoky, varying 

 to nearly hyaline, with the apex hyaline and slightly milky ; nervures and stigma 

 piceous, second submarginal cell narrowed rather more than half to marginal. 

 Abdomen minutely roughened, pruinose. hind margins of segments inclined to 

 be slightly pallid, with bands of appressed white pubescence, neither so broad 

 nor so dense as in rhodocerntas. 



Hab. — Las Cruces, New Mex. On flowers of Pedis papposa 

 Sept. 17, 1895, three males. 



P. olivice is very near to rhodoceratus, but is easily known by its 

 smaller size, wholly black legs, and the peculiar coloration of the 

 wings. 



The stigma of olivice and rhodoceratus is considerably smaller than 

 thut of andrenoides ; and these two species agree in having the inner 

 angle formed by the second recurrent nervure and the cubital ner- 

 vure considerably less than a right angle, whereas in andrenoides it 

 is greater than a right angle. P. andrenoides Cresson is a Spring- 

 species, and is common at Las Cruces on flowers of Sisymbriani at 

 the middle of April. 



TRANS. AM. ENT. SOC. XXIV. JUNE. 1897 



