Records of Bees. 233 



Boulder, Colorado, April 10^ at flowers of Negundo. The 

 male of A. cockerelU, Graeniclier, has the hair ou lower half 

 of sides of metathorax white, and hair all white on middle and 

 hind femora, but otherwise it is like A. albihirta. Male 

 albihlrta has the hair on sides of metathorax all black and a 

 good deal of long black hair ou all the femora. 



Prosopis mediolucens, sp. n. 



(^ . — Length 6 mm. or slightly more. 



Black, with yellow markings (turned red by cyanide in 

 the type). Head ordinary, rather broad; front extremely 

 densely and minutely punctured, sides of vertex irregularly 

 and more sparsely, showing the shining surface ; clypeus 

 with large close punctures; face below autennse yellow; 

 supraclypeal mark ending obtusely between antennae ; lateral 

 marks ending at about level of middle of scape, where they 

 are obliquely truncate, somewhat notched; scape only mode- 

 rately thick, wuth a broad yellow stripe in front ; flagellum 

 dark ferruginous above, pale ferruginous beneath ; thorax 

 with short white hair, as usual ; mesothorax finely and closely 

 punctured, but shining, scutellum more coarsely and irregu- 

 larly punctured ; metathorax convex, finely rugulose, but 

 basal area large, semicircular, smooth and shining, with 

 strong transverse ridges laterally ; pleura coarsely and 

 densely pu.nctured ; upper border of prothorax interrupted 

 in middle, and tubercles yellow ; tegulae light testaceous. 

 "Wings clear, stigma ferruginous ; first r. n. joining extreme 

 apical corner of first s.m. ; second s.m. much longer than 

 high. Legs shining, with the knees, apical third of anterior 

 femora beneath, anterior tibioe except a patch behind, middle 

 and hind tibiae except a broad subapical annulus, and the 

 basitarsi yellow ; small joints of tarsi ferruginous. Abdo- 

 men shining, finely punctured, the first segment sparsely 

 and feebly ; hind margins of first three segments at sides 

 thinly hairy ; apex with a brush of Avhite hair. 



Hab. Takao, Formosa, Nov. 21, 1907 {Sauter). Berlin 

 Museum. 



Genus new to Formosa. An ordinary-looking little species 

 of Palsearctic f acies, with face-marks nearly as in the American 

 P. citrinifrons, Ckll., but recognizable by the character of 

 the metathorax. With a compound microscope it is seen 

 that the apical half of the metathoracic enclosure has three 

 complete transverse ridges, which are quite straight, while 

 the basal half has four somewhat oblique ridges on each side, 

 these being evanescent and more or less coalescent in the 

 middle. So far as I know, this sculpturing is unique. 



