160 Mr. T. D. A. Cockerell — Descriptions and 



silvery- white fascia below costa; a silvery-white fascia from 

 base along median nervure to middle of cell, then curved 

 upwards to apex towards which it becomes maculate ; a series 

 of silvery-white marks in interspaces of terminal area, reduced 

 to small spots towards apex and becoming elongate streaks 

 between veins 5 and 1, the streaks above veins 4 and 3 some- 

 times confluent with the white fascia. Hind wing fulvous 

 yellow. 



Hab. Natal, Howick (Cregoe), 2 $ type; Basutoland, 

 Pithaneng Valley (Craivshay), 1 £ , Exp. 24 mm. 



Allied to D. ibex, Wllgrn. 



Dalaca hololeuca, sp. n. 



Head, thorax, and abdomen white slightly mixed with 

 brown; antennae fulvous; sides of frons and legs brown. 

 Fore wing white with a very faint ochreous-brown tinge, the 

 veins whiter, the costal edge brown. Hind wing white with 

 a very faint ochreous-brown tinge. Underside of both 

 wings suffused with pale brown. 



Ab. 1. Fore and hind wings more strongly tinged with 

 brown. 



Hab. Transvaal (Pead, Cholmley), 2 ? ; Natal, Estcourt 

 {Hutchinson), 2 <$ type; Orange R. Colony, Bethlehem 

 [Arnold), 1 $. Exp., <$ 34, ? 34-10 mm. 



XVI. — Descriptions and Records of Bees. — XXXI. 

 By T. D. A. Cockerell, University of Colorado. 



Prosopis xanthaspis, sp. n. 



5 . — Length about 7 mm. 



Head and thorax black, abdomen black with a faint blue 

 tinge ; head entirely black, face finely striatulate, front and 

 vertex punctured ; flagellutn dull ferruginous beneath ; meso- 

 thorax finely but distinctly punctured ; tubercles broadly, 

 scutellum (except anterior margin), postscutellum, and some- 

 times axillar triangle all bright chrome-yellow, no other 

 yellow about the insect ; legs black ; area of metathorax 

 roughened ba sally. Wings clear, the recurrent nervures 

 meeting the transverso-cubitals, or nearly. Abdomen dull at 

 base, more shining beyond. Buns in table of Australian 

 Prosopis to 43, and runs out because of the lack of yellow 

 on pleura ; if placed among the metallic species, runs to 14, 

 and runs out because the face is without light markings. 



