148 ENTOMOLOGICAL NEWS [xxxii, '21 



eye; area just laterad of lateral ocelli impunctate, polished, but becom- 

 ing punctate again near median edge of eye. Flagellum about one and 

 three-fourths times as long as the scape ; third antennal segment longer 

 than the fifth, the fifth a trifle longer than the fourth. 



Thorax with dorsal cephalic portion covered with pure yellow pile, 

 the yellow pile extending (except for a little black pile on the middle 

 of its posterior border) caudad to the cephalic margin of the scutellum. 

 Scutellum with pure black pile ; disk naked, impunctate, polished. Meso- 

 pleura, except for the yellow pile of dorsum slightly extending down 

 below the level of the bases of wings, jet black. Metapleura and pro- 

 podeum jet black. 



Abdomen with the first four dorsal segments entirely jet black, the 

 fifth dorsal segment with some whitish-yellow pile on its lateral and 

 apical margins, sixth dorsal segment black. Venter black. Hypopygium 

 without a median carina. 



Legs mostly jet black, but with some lighter or ferruginous short 

 pile on tarsal segments. Corbicular fringes black. Hind metatarsi dis- 

 tinctly arcuate. 



Wings very dark, with a slight violaceous reflection. 



Length, 23 mm. ; spread of wings, 44 mm. ; width of abdomen at 

 second segment, 10.5 mm. 



Holotypc queen, July 7, 1917 (Collector E. J. Oslar). Para- 

 topotype queen, July 8, 1917 (Collector E. J. Oslar). Nogales, 

 Arizona. Male and worker unknown. 



This large species, judging from the queens alone, is appar- 

 ently closely related to B. occidental-is Greene. It may be dis- 

 tinguished easily from B. occidental-is Greene and its varieties, 

 by the marked differences in the color pattern of the dorsum 

 of the thorax, apical segments, the prominent whitish-yellow 

 pile on the occiput, violaceous wings, and black corbicular 

 fringes. B. franklini also lacks the transverse yellow band on 

 the fourth dorsal abdominal segment, so characteristic of B. 

 vosnesenskii Rad. and usually of B. californicus F. Sm., two 

 other species with contrasting yellow and black pubescence 

 from this region. 



I name this species in honor of Dr. Henry J. Eranklin. 

 whose monograph of this group of bees brought order out of 

 chaos in the American species. 



B. franklini and B. occidcnlalis are the first species of the 

 Tcrrcstris Group Rad. to be found south of the southwestern 

 deserts (if the United States. B. franklini probably occurs in 

 the mountain ranges in the northwest of Mexico. 



