Records of Bees. 329 



Second s.m. on first discoidal 289 



„ . third „ 102 



Length of third submarginal cell 578 



,, first discoidal cell 1700 



Upper section of basal nervure 272 



Lower „ „ „ (not allowing for 



curve) 748 



In the hind wing- the t.-m. is 170 yu- long and the distance 

 from the t.-m. to the cubital is 711. 



Differs from A. sepulta and A. clavula by having the 

 second s.m. much broader above and various details of the 

 venation. From A. clavula it also differs in the form of the 

 abdomen. 



Hub. Miocene shales of Florissant, Station 13 B (1908). 



Stelis seneciophila, sp. n. 



$ . — Length about 7^ mm. 



Brilliant dark shining blue, with black pubescence ; punc- 

 tures on head and thorax strong and dense, but well separated 

 on front ; punctures on abdomen somewhat smaller and more 

 separated, but extremely dense on the apical two segments ; 

 tegulae and legs dark blue. Wings nearly clear, but the apex 

 greyish and a grey shade in marginal cell ; second r. n. going 

 beyond end of second t.-c. 



Closely related to S. montana, Cresson, but smaller and 

 more slender, with no green tints, and with clearer, not 

 brownish, wings. The first r. n. joins the second s.m. as far 

 from its base as half the length of the first t.-c, or nearly 

 that ; in montana it is nearer to the base of the cell, or even 

 sometimes meets the t.-c. The last two joints of the labial 

 palpi are conspicuously more slender than in montana. 



Hab. Florissant, Colorado, at flowers of Senecio cymbalari- 

 oides, June 29, 1908 {8. A. Rohwer). 



S. montana also occurs at Florissant, and is variable in 

 size and colour (the largest ? is 10^ mm. long), but always 

 readily distinguishable from S. seneciophila. 



Dioxys rohwer i, sp. n. 



$ . — Length about 6h mm. 



Black, densely punctured, with white pubescence ; abdomen 

 with the usual white hair-bands ; hind margin of sixth 

 segment ferruginous; tibial spurs bright ferruginous; hair 

 on inner side of tarsi yellowish ; tegular with ;i large ferru- 

 ginous spot. Wings dusky hyaline, upper half of marginal 

 cell faintly clouded. Fyes pale greenish. 



