152 THK i ANADIAN ENTOMOLOGIST. 



much the longest ; second recurrent nervure evanescent ; legs with much 

 white hair ; femora black (anterior ones metallic behind), with the apices 

 yellow, and a broad light yellow band in front on anterior and middle 

 pair; anterior and middle tibiae yellow, with a large dark patch behind ; 

 hind tibire dark, with the base and the inner side light yellow ; tarsi 

 yellowish-white, hind ones more or less darkened and reddened; abdomen 

 black, with white bands, which are partly or wholly interrupted sublaterally; 

 band on first segment twice as broad at sides as in middle, but sublaterally 

 reduced to a hardly visible line by a rounded invasion of the black; bands 

 on second and third excavated in the middle anteriorly, and with a large 

 black spot on each side sublaterally ; bands on fourth and fifth deeply 

 emarginate, almost interrupted, sublaterally ; that on sixth reduced to 

 a hardly visible marginal line ; venter black, with obscure linear white 

 bands. In my table in Proc. Phila. Acad., 1896, this runs to 64, and 

 runs out because of the conspicuous white abdominal bands. It is con- 

 siderably larger than P. albovittata, Ckll., and P. callicerata, Ckll., 

 which also visit the Baileya, but is related to them, and combines some of 

 their characters. There is some resemblance to P. pctpulchra, Ckll., but 

 in that insect the male has the face all light. 



Hab. — Mesilla, New Mexico, at flowers of Baileya multiradiata, 

 June 30, 1897 (Cockerell). Two males. 



Perdita callicerata, var. leucura, n. var. 

 9 . — Length slightly over 5 mm.; head and thorax very hairy ; clypeus 

 white, with the usual dots ; lateral marks white, tapering above, to end in 

 sharp points on orbital margin near lower ends of facial foveae (a little 

 above level of antennae) ; antennae coloured as usual, the flagellum largely 

 orange ; abdomen cream-colour, with sepia-brown markings, consisting of 

 a brown basal area and (separated only by a fine line, and not reaching 

 the lateral margins) a transverse band on first segment, three spots on 

 second segment, usually two on third, and fine basal lines on second to 

 fourth : venter pale. Wings and legs as in P. callicerata, Ckll. 



This might be described as a P. callicerata, with the abdomen and 

 lateral face-marks of P. pallidiot\ Ckll. The broad face and the hairiness 

 are entirely as in P. callicerata, and readily distinguish it from P. pallidior 

 and P. mcntzeliarum. Is the insect perhaps a hybrid ? 



Hab. — Mesilla, New Mexico, at flowers of Baileya multiradiata, 

 June 30, 1897 (Cockerell). Three females, flying with P. baileya; and P. 

 callicerata. 



