90 Mr. T. D. A. Cockerell on Bees of the 



minutely sculptured and with large rather close punctures ; 

 no median impuiictate area. Basal process of labruni broadlj 

 triangular. Hairs fringing labrum and on lower part of 

 clypeus dark brown, with a reddish tint. Antennse short; 

 first joint of flagellum as long as the two next together, tip 

 of flagellum becoming reddish brown. Sides of face with 

 broad pale greyish-ochreous bands of appressed pubescence. 

 Tegulse piceous. Wings with the outer margin broadly tinged 

 dusky. Stigma darker than in male. Abdomen with four 

 very distinct pale grey hair-bands, all continuous. Anal 

 fimbria dark grey-brown, with rather a chocolate or purplish 

 tinge. The clypeus may have a narrow median impunctate 

 line. 



Hab. College Farm, Mesilla Valley, N. M., on flowers of 

 plum, April 9, 1895 (one male, one female) ; April 10, 1895 

 (one female) ; March 25, 1896 (one female) ; March 26, 1896 

 (one male). Also on Sisymbrium^ April 12, 1895 (one male), 

 and April 16 (one female). 



Miss Casad had described the two sexes as distinct species, 

 and 1 should myself have treated them as such but for the 

 circumstances of their capture. They do not differ, however, 

 as much as the sexes of A. vicina, though in a different way. 

 A. 2^^'^(^^'<^(^) Sm., must be a similar species, but the abdo- 

 minal bands in the female are not entire. The description of 

 A. verecunda, Cv., almost exactly applies, but that has the 

 anal fimbria cinereous, whereas the dark anal fimbria is 

 perhaps the most noticeable feature of electrica. 



ft Abdomen -without hair-bands ; stigma ferruginous. 



Andrena mesiUce, Ckll., sp. n. 



J* . Length about 11 millim. Quite stout, with the abdo- 

 men oval, convex, shining ; black, the pubescence silky, 

 greyish white, very copious on head and thorax, practically 

 wanting on abdomen, except on first and second segments, 

 which are delicately pruinose-pubescent, the pubescence 

 dense enough at the sides to be rather conspicuous. Head 

 rather large, a little broader than long. Clypeus concealed 

 by dense white pubescence ; front mostly bare, striatulate ; 

 vertex with rather sparse punctures. Cheeks swollen behind. 

 Antennge rather long, dark chocolate-brown ; first joint of 

 flagellum very short, no longer than second. Mandibles 

 entirely dark. Thorax densely pubescent, the pubescence of 

 the same colour throughout, nowhere at all ochraceous ; en- 

 closure of metathorax bare, with no raised rim, dull, minutely 



