On North- American Bees of the Genus Aiilrenu. 101 



pedibus omnibus gracilibus, til)iis anticis fere aDqualiter triden- 

 tal is, femoribus posticia paulo itiflatis. 

 Long. 15*5 mm. 



Hah. Brit. East Africa, Mombasa. 



This is a considerably smaller insect than T). dehicjnensis, 

 Brenske, and of broader, less convex form. Its pubescence 

 also is less uniform, beinp^ short and inconspicuous upon the 

 cly|)eus, elytra, and pygidium, and long and dense upon the 

 vertex and pronotum, whereas in the type species it is short 

 and velvety over the whole uj)per surface. The teetii of the 

 anterior tibiie are rather less strong in the new species, but 

 the hind femora are rather bulbous, as in D. deligoensis. 

 The antennas are similar in both species, but the maxillary 

 palpi of 1). crinitus are rather longer and more slender than 

 in the other. 



A single male specimen was brouglifc from the Rabbai 

 Hills, Mombasa, by the Rev. W. VV. Taylor. 



XX. — North- American Dees of the Genus Andrena. 

 By T. 1). A. COCKERELL. 



Andrena medionitens, sp. n. 



? .— Length 8-9^ millira. 



Black J head ordinary, facial quadrangle nearly square ; 

 antennae short, faintly brownish beneath, first joint of flagel- 

 lum a little longer than the next two united; facial fovete 

 broad throughout, white, separated from the eyes by only a 

 linear interval ; sides of face, vertex, and occiput covered with 

 fulvous hair (no black hair anywhere about head or thorax) ; 

 clypeus shining, with rather close large punctures and a 

 median inipunctate line ; process of labrum broad, concavely 

 truncate ; thorax rather densely covered with erect stiff 

 fulvous hair, except tiie middle of mesothorax and scutellum, 

 which are bare and siiining ; mesothorax where covered with 

 hair dull and tessellate, \\ ith rather sparse shallow (but quite 

 distinct) jjunctures ; the shining part is also sparsely punc- 

 tured ; metathorax dull and roughened, the enclosure ill- 

 defined and without any ridge or plicaj ; tegulae dark 

 brownish; wings yellowish, faintly dusky at apex; stigma 

 and uervures clear orange ferruginous; legs black, with pale 

 fulvous hair ; middle tarsi dark reddish ; hind tibiic and tarsi 

 ferruginous, the former stained with black on the inner face ; 



