Descriptions and Records of Bees. 103 



xxxv. p. 174) hardly merit the rank, with the exception of 

 Gnathias, which certainly has an excellent distinctive struc- 

 tural character in the bidentate mandibles. 



Robertson considers N. annulata, Sm., $ (ncc ? ), to be 

 synonymous with Nomada {Centrias) americana, K. (Trans. 

 Amer. Ent. Soc. xxii. p. 125). The male of Smith's species 

 certainly has the characters of Centrias as defined by Robert- 

 son (/. c), but there appears to be no reason to doubt that 

 Smith had correctly associated the sexes, and N. annulata ? 

 is certainly not a Centrias as defined (/. <?.). 



Nomada vinnula, Cress. 

 Nomada vinnula, Cresson, Trans. Amer. Ent. Soc. vii. p. 202 (1879). 



homada interceptor, Smith, Descr. New Spec. Hymen, p. 100 (1879), 

 <S- 



Smith's type, from Vancouver, agrees with a male labelled 

 "N. vinula " by Cockerell. Cresson's species has priority 

 by a few months. The spelling of the specific names is that 

 employed by the authors respectively, but they appear in 

 literature as "vinula " and " intercepta." 



XV. — Descriptions and Records of Bees. — LIII. 

 By T. D. A. Cockerell, University of Colorado. 



Megachile lieliophila, sp. n. 



$ . — Length about 10 mm., expanse .20. 



Black; rather robust, but parallel-sided; head rather 

 large, the checks and vertex very broad ; clypeus densely 

 and strongly punctured, but shining between the punctures, 

 wholly without any median smooth or raised line, the 

 lower margin slightly undulate, obscurely subemarginate in 

 middle ; mandibles broad and stout, the third tooth remote 

 from the second, the apical part not covered with hair ; 

 from beneath the lower edge of clypeus, and from lower edge 

 of mandibles, comes bright ferruginous hair, and there is a 

 tuft of long hair of the same colour on the end of the 

 labium; antenna: entirely black; vertex closely and finely 

 punctured; hair of head and thorax long and loose, mostly 

 white, but brownish on clypeus, black on vertex and disc 

 of meso thorax, and much long black hair mixed with the 

 pale on seutellum ; mesothorax and scutelluui very minutely 



