406 Prof. T. D. A. Cockevell on 



Andrena aureocincta, Ckll., 1896. 



J Jab. San Ignacio, Sept. 1, 1 c? (Wilmatte Porter). 

 Previously known only by the unique type. 



Andrena grandior, Ckll., 1897. 



Hah. BeulahjJuly 26, 1 ? {Wilmatte Porter) ; Aug. 18, 

 1 ? {Ckll). 



Previously known only from Wasliington State. The 

 specimens are 10 n)illim. long, thus a trifle smaller than the 

 type. Easily known from rugosa by the broad lateral frontal 

 depressions, which follow the orbital margin, whereas in 

 rugosa they diverge from it below, leaving a smooth shining 

 space adjacent to the eye. A. rugosa is also a vernal species, 

 flying in April. 



Andrena nitidior^ sp. n. 



$ . — Length 12 millim. 



Black, with ochraceous pubescence, dense on head and 

 thorax ; abdomen shining, microscopically tessellate, the 

 excessively minute sparse ])unctures indicating the origins of 

 the almost invisible short hairs ; the sides rather more hairy, 

 tending to form thin bands at the sides of the apical margins 

 of the second and third segments and all along the margin of 

 the fourth ; apex densely clothed with light reddish-ochraceous 

 hair ; hind tarsi and small joints of the other tarsi ferrugi- 

 nous ; wings smoky, a little darker on outer margin ; stigma 

 and nervures dark ferruginous ; stigma very narrow ; second 

 submarginal cell large; process of labrum broad and low, 

 emarginate. 



Very similar to A. helianihi^ with the same pubescence on 

 the head and thorax, the same narrow stigma, &c., but easily 

 distinguished by the smaller shining abdomen and the darker 

 wings. The base of the metathorax is minutely granular, 

 the enclosure only defined by the absence of hair and its finer 

 sculpture; the mesothorax is entirely dull and coarsely 

 granular, the parapsidal grooves distinct ; the lateral facial 

 depressions are broad and follow the orbital margin to their 

 lower ends ; the clypeus is strongly punctured ; the flagellum 

 is only faintly ferruginous beneath towards the end. 



Bob. San Ignacio, Sept. 1, 1899, 2 ? [Wilmatte Porter). 



One has the hind tibia3 light ferruginous, witii a dark 

 blotch in front and behind. In the other the hind tibite are 

 covered with bright orange pollen, as also the femora and 

 base of metathorax. Superficially the insect has a considerable 

 resemblance to A. prutii, Rob. 



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