NO. 1852. BEES OF THE GENU8 NOMADA^COCKERELL. 239 



luster of taraxacella, and the longer third antennal joint. The Rocky 

 Mountain sayi is not quite typical; it ma}^ prove to grade into the 

 Pacific coast N. oregonica Cockerell. 



NOMADA MERA Cockerell. 



TNvo females (Baker 2075 and 2212) and one male (Baker 2075) 

 from Colorado. The male, which has not been described, has the 

 following characters: Length about 8 mm.; head and thorax with 

 much white silky hair; clypeus, supraclypeal mark (broader than 

 long), lateral face-marks (filling space between clypeus and eye, 

 except a dark stripe along sides of upper part of clypeus, narrowing 

 above antennae, and passing into a red band which reaches top of 

 eye), labrum, mandibles (except the ferruginous apical part), and 

 front of the thick scape, all paZe yellow; flagellum bright ferruginous, 

 the basal half black above; third antennal joint about half as long as 

 fourth ; mesothorax dark red with a broad median black band, and black 

 lateral margins; scutellum nearly all bright red; sides of metathorax 

 with much white hair; metathorax all black; pleura with a small 

 obscure red spot ; tubercles yellowish red ; upper border of prothorax 

 red; tegulae light yellowish testaceous; legs bright ferruginous, with- 

 out yellow; hind femora strongly blackened beneath; hind basitarsus 

 with a dark streak; abdomen colored and marked practically as in 

 female; apical plate strongly notched. In Robertson's table ^ this 

 runs nearest to N. cresonii Robertson. The female is easUy separated 

 from N. cymhalarise Cockerell by the abundant white hair at the sides 

 of the metathorax. 



Female N. mera was also taken at Boulder Falls, Boulder County, 

 Colorado, May 23, 1908 (Hite). 



NOMADA CRAWFORDI Cockerell. 



Berkeley, Colorado, female, June 10, 1897 (collector unknown) . In 

 1907 Mr. S. A. Rohwer took this species at flowers of Antennaria 

 microphylla, Florissant, Colorado, June 15, two males; and at flowers 

 of Drymocallis fissa, Topaz Butte, Colorado, June 23. 



NOMADA XANTHOLEPIS, new species. 



Male. — Length IH mm. or rather more, anterior wing nearly 9 

 mm.; black and yellow, the legs red and yellow, pubescence a rather 

 sordid white; head broad, facial quadrangle broader than long; eyes 

 pale greenish-gray; labrum, mandibles except apex, sides of face, 

 clypeus and nearly square supraclypeal mark, all bright yellow; a 

 small dark spot on each side of clypeus, contiguous with a round spot 

 beyond the suture; a black band along each side of supraclypeal mark 

 and upper part of clypeus, the broad lateral areas otherwise all j^ellow, 



1 Canadian Entomologist, June, 1903. 



