402 Prof. T. D. A. Cockerell on 



exactly like A. nigerrima, Casad, but it differs as follows : — 

 Wings yellower, stigma paler ; clypeus much more produced 

 and much more sparsely punctured ; malar space much longer, 

 nearly as long as broad ; abdomen practically impunctate, 

 the sparse punctures barely visible, the broad hind margin of 

 the first segment, which in nigerrima is so conspicuously 

 punctured, quite smooth and impunctate. The process ot 

 the labrum is obtuse and entire. 



Differs at once from A. nigra, Prov., by the very sparsely 

 punctured clypeus. 



Bah. Las Vegas Hot Springs, N. M., at flowers of Salia;, 

 spring of 1899 [Wihnatte Porter). 



The following four species all appear in the latter half of 

 summer or early autumn, and agree in having the abdomen 

 of the tessellate-impunctate type and the process of labrum 

 produced and emarginate. They may be separated as 

 follows : — 



Mesothorax smooth, sliming ; hair at apex of ahdo- 

 men white. 



Process of labruiu with a deep emargina- 



tion ; stigma black ... xanthigera, Okll. 



Process of labrum with a shallow emargina- 



tion ; stigma pale albovivgata, Ckll. 



Mesothorax granular, dull. 



Process of labrum usually with a deep 

 emargination ; size larger ; hair at 

 apex of abdomen sooty. 



Clypeus densely punctured .... apacheorum, Ckll. 

 Clypeus sparsely punctured .... apacheorum, var. 

 Process of labrum with a shallow emar- 

 gination ; size smaller; clypeus tessel- 

 late and rather sparsely punctured . . segreyans, Ckll. 



Andrena xanthigera, sp. n. 



$ . — Length about 9 millim. 



Black, with rather long greyish-white pubescence. Eyes 

 parallel, facial quadrangle broader than long ; cheeks ample ; 

 vertex dull and granular ; front striated ; antennse black, a 

 little ferruginous beneath towards the ends ; sides of face 

 with rather abundant long hair; clypeus shining, very closely 

 punctured at the sides, sparsely in the middle, with an im- 

 punctate median line ; malar space almost obsolete; process 

 of labrum produced, deeply emarginate, the emargination 

 rectangular ; mesothorax shining but microscopically tessel- 

 late, with sparse, feeble, minute punctures, and a few larger 

 ones scattered about ; metathorax granular, dull, basal area, 



