416 Messrs. T, D. A. Cockerell anc? W. Porter on Bees. 



Perdita (Tetraperdi'ta) sexmaculata^ Ckll. 



? . — About 4i niillim. long. 



Very shiny, with thin white pubescence on the cheeks, 

 pleura, legs, and end of abdomen, but little elsewhere. Head 

 and thorax dark olive-green, clypeus and supraclypeal area 

 black ; face wholly dark ; scajie black, coarsely punctured or 

 nialleate ; flagelkun brown above, yellowish beneath; clypeus 

 and sides of face with sparse but distinct punctures ; labrutn 

 with a group of about six large punctiform depressions on 

 each side ; mandibles yellowish ferruginous towards the tips ; 

 frontal fovese black grooves ; facial quadrangle slightly 

 broader than long ; vertex granular or minutely tessellate ; 

 mesothorax and scutelluni smooth and very shiny, with a very 

 iew scattered punctures ; base of metathorax dark blue, con- 

 trasting with the olive-green scutellum and postscutellum ; 

 tegula; brown in front, wliitish behind ; wings clear, nervures 

 and stigma dark sepia-brown ; stigma pallid in the middle ; 

 recurrent and transverso-cubital nervures broken by hyaline 

 dots; marginal cell obliquely truncate, the poststigmatal 

 portion about equal to the substigmatal ; second submarginal 

 cell narrowed more than half to marginal, forming an equi- 

 lateral triangle with the upper angle cut off; third discoidal 

 distinct; legs black, anterior tibiffi yellowish iu front; abdo- 

 men flat, shining black, with six round yellowish-white spots 

 at the sides of segments 2 to 4 ; venter black. 



(un? 



Perdita sexviaculata, Ckll. 



(J . — About 4 niillim. long. 



Very shiny, with thin white pubescence on the cheeks, 

 pleura, and end of abdomen ; fairly abundant pubescence on 

 the legs, and widely scattered white hairs on the rest of the 

 body ; head and thorax dark green ; mesothorax almost 



