398 Mr. T. D. A. Cockerell on new Hymenoptera 



1. Leiiprth over 14 niillim. ; scape without 



yellow ccesaljrinice, Ckll. 



Lenprth under 14 millim. ; scape yellow in 



front rhodopus, Ckll. 



2. Abdomen with narrow hair-bands ; clypeus 



yellowish white Hoffmmtseggice, Ckll. 



Abdomen without hair-bands ; clypeus 



lemon-yellow lanosa, Cr. 



Mr. Fox has suggesed (Proc. Cal. Ac. Sci. 1893, p. 22) 

 that lanosa is very likely identical with mexicana, Smith. 

 C. mexicana was described from a female, which is at all 

 events quite different from that which I have here referred to 

 lanosa. I am much indebted to Mr. L. O. Howard for 

 sending me copies of a number of descriptions of Centris 

 to which I had not access. 



Perdita perpuhhra, Ckll., 1896. 



This species was described from the female only. The 

 male is new. It is slightly smaller than the female, and the 

 light markings are all lemon-yellow. The face is all yellow 

 beneath the level of the antenna?, except the usual clypeal 

 dots and a little black round the dog-ear marks; supra- 

 clypeal mark much broader than long, extending only as far 

 as lower level of antennal sockets, while the lateral marks 

 end broadly at the higher level. Cheeks unarmed. Eyes 

 sage-green. Scape wholly yellow. Prothorax with less 

 pale colour, but the hind margin continuously yellow. Meta- 

 thorax bluer. Hind femora black above, except terminal 

 fourth. First segment of abdomen with more black ; bands 

 on remaining segments reduced, more or less broken into 

 spots. Apex yellow, inclining to orange. Venter yellow, 

 with a series of transverse black patches. 



Hah. College Campus, Mesilla Valley, N. M., on Verhe- 

 sina encelioides, Sept. 16, 1895 (Miss MacGilmore). 



In my key to the species of Perdita (Proc. Ac. Nat. Sci. 

 Philad. 1896, p. 48) this will fall in with sphceralcece (J, 

 from which it is readily distinguished thus : — 



Stigma mnrfrined with brown ; venter of abdomen im- 

 maculate in middle spharulcecB J . 



Stigma pale orange, not margined with brown ; venter 



with a series of large black patches down the middle, perptdchra cJ . 



Perdita erigeronis, sp. n. 



(J. — Length 4^ millim. 



Head tolerably large, cheeks unarmed, bearded with white 



