I 



Monographie der Bienengattung Centris (s. lat.). 34 1 



and tarsi internally reddish-brown, that on first Joint of hind tarsi internally, dark; 

 wings subhyaline, nervures blackish. Length i6 mm. 



New Mexico: »Las Cruces (August 23) on flowers of Cevallia sinuata.<s. One 

 specimen received from Mr. Cockerell and bearing the label »C. caesalpiniae cf«, 

 which name was probablv attached to it bv error, as it neither agrees with the descrip- 

 tion of the male of C. caesalpiniae, nor is it even closely allied to the female of that 

 species. Its aftinities are to C. moj'sei, from which it does not differ structurallv. 



5. Centris caesalpiniae Ckll. 



1897. Centris caesalpiniae Cockerell, cT §, Ann. and Mag. Nat. Hist., ser. 6, XIX, 

 pag. 394. 

 New Mexico: Las Cruces. I have not seen the male of this species, a specimen 

 received from Mr. Cockerell, marked »C. caesalpiniae cf«, differing so obviously 

 from the description that I have concluded that it was so labelled by mistake, and have 

 described it as new (see C. marginata). 



6. Centris rhodopus Ckll. 



1897. Centris caesalpiniae var. rhodopus Cockerell, cf 9, Ann. and Mag. Nat. Hist., 

 ser. 6, XIX, pag. 395. 

 New Mexico: Las Cruces. It seems better to regard this as a distinct species from 

 C. caesalpiniae; it has well-marked differences. On male, sent by Mr. Cockerell, has 

 the abdominal hair-bands more distinct and regulär, and the pubescence of first hind 

 tarsal Joint, instead of being entirely dark, is about evenly divided between dark-brown 

 and whitish. 



7. Centris hoffmannseggiae Ckll. 



1897. Centris Hoffinannseggiae Cockerell, o, Ann. and Mag. Nat. Hist., ser. 6, XIX, 



pag. 395 (non 9). 

 1897. Centris lanosa Cockerell (not Cresson), 9, Ann. and Mag. Nat. Hist., ser. 6, XIX, 



pag. 397 (non cf). 

 New Mexico: Mesilla Valley. To my mind Mr. Cockerell has confused the sexes 

 of hoffmannseggiae and lanosa, judging from his descriptions. Cotypes of hoff- 

 mannseggiae 9 differ at once from the described male in their bare abdomen beyond 

 the first Segment, the cf having the abdomen pubescent on all the segments, especially 

 the two first. Now, the 9 lanosa described by Cockerell, has »the second abdominal 

 Segment, as well as the first, delicatelv pruinose«. In the male lanosa the first Segment 

 only is pruinose. 



8. Centris cockerelli Fox. 



1897. Centris Hoffmannseggiae Cockerell, 9, Ann. and Mag. Nat. Hist., ser. 6, XIX, 

 pag. 395 (non cT). 

 New Mexico: Mesilla Valley. I propose this name for the species described as 

 the female of Hoffmannseggiae, which is apparently distinct from the latter. 



