1916.] NATURAL SCIENCES OF PHILADELPHIA. 585' 



with a blackish apical half, slightly convex at apex where it is finger - 

 shaped in outline, terguio with inconspicuous blackish and whitish 

 hairs, second, third and fourth tergites with a well-defined apical 

 whitish hair hand, fimbria pale brownish stramineous. 

 Andrena (Andrena) yumorum new species. 



Type. — No. 4,019. The Academy of Natural Sciences of Phila- 

 delphia. 



Type Locality. — California (E. Norton). 



Presumably related to A. (A.) micranthophila Cockerell. 



Male. — Length 13.5 mm.; body black, mostly covered with black 

 hair; head with its facial line : transfacial line :: 77 : 94, axial 

 line : temporal line :: 42 : 21, temples rounded, subtrapezoidal, 

 malar line : joint 8 of antennae :: 2 : 12, elevated portion of malar 

 space much shorter than the depressed portion, head covered with 

 long slender hairs throughout, clypeal hairs and a tuft adjoining 

 mandibles whitish, supraclypeal area and area around base of antennse 

 with a mixture of whitish and blackish hairs, mandibles and lab rum 

 with pale hairs, rest of head with black hairs, front partly sparsely 

 pitted, mostly coarsely striate, ocellocular line : ocelloccipital 

 line :: 20 : 9, face shining, covered with distinct, adjoining or nearly 

 adjoining punctures, clypeus apparently slightly elevated directly 

 above the apical margin, almost polished, convex except on the apical 

 half down the middle where it is apparently slightly concave, and 

 punctured like the face, sculpture of the clypeus nearly hidden by the 

 moustache, labrarea nearly triangularly emarginate on its inferior 

 aspect, its anterior aspect truncate, width at base : length down the 

 middle :: 14 : 7, width at apex : length down the middle :: 6 : 7, 

 length down the middle : greatest length :: 7 : 8, labrarea at base 

 apparently at least twice as wide as the labrum, the latter with a 

 fringe of golden hairs, joint 3 of antennas : joint 4 :: 12 : 7, joint 

 4 as long as thick, following joints a little longer than thick by 

 measure although appearing distinctly longer than thick, dullish, 

 flagel nearly straight in outline, antennse blackish throughout, man- 

 dibles typical, robust, extending to the outer edge of the labrum, 

 black except for the apical half which is mostly dark reddish, palpi 

 nearly typical ; thorax covered with an abundance of pale and black 

 hairs, hairs of dorsulum shorter than hair of mesopleurse, dorsulum 

 distinctly punctured, dullish compared with the face, its punctures 

 smaller and closer together than on the face, in addition covered with 

 black hairs except along the edges where there are pale ochreous 

 hairs, notauli represented by a shining line, mesopleurse with whitish 



