4 PROCEEDINGS OF THK NATIONAL MUSEUM. vol. 60. 



BOMBUS RUFOCOGNITUS, new species. 



Female. — A species of the B. mastmcatus group, with short malar 

 space (though not quite so short as in masfrucatus) and toothed 

 mandibles. Length about 22 mm., anterior wing 18 mm. ; head with 

 black hair ; ocelli small ; clypeus convex, polished, dull at sides, very 

 sparsely punctured ; malar space broader than long, but not so short 

 as in B. laticeps Friese; mandibles 5-dentate; thorax with bright 

 fox-red hair, except a broad black band between the wings ; tegulae 

 piceous, reddish posteriorly; wings dark fuliginous; legs black (the 

 hind tibiae and basitarsi obscurely reddish), with black hair, more 

 or less red on femora beneath ; first two abdominal segments with 

 bright lemon-yellow hair, next two with black (but the yellow hair 

 overlapping base of third), apex with bright red hair. 



Suifu. Szechwan, China (Graham). Two females. 



Type.— Cdii. No. 24880, U.S.N.M. 



The red hair of thorax, contrasting with the yellow of the base of 

 the abdomen, is ver}' remarkable. The species resembles B. laticeps 

 Friese, but differs by the longer malar space, and t.Avo abdominal seg- 

 ments black-haired. It is easil}^ distinguished from B. alienus Smith, 

 by the dark wings. It is readily known from B. hraecafvs Friese by 

 the red thoracic hair and shorter malar space. 



Thirty-four forms of Bomhus are known from China, not includ- 

 ing three species and four varieties peculiar to Formosa. None of 

 these is exactly identical with any of the 16 known from Japan or 

 the 3 known from Sakhalin, but a few of the Chinese species occur 

 in the Himalayas. Certain of the Chinese forms have been referred 

 as subspecies or varieties to the European B. lapidaHus, hortoruvi, 

 ■pj'atorurti^ mendax^ and terre&fris, but they are at least distinctively 

 colored. Japan contains endemic races of B. hortorum, 7Jiusconcm, 

 sHvarurn, terrestris, and prafom?)i, in addition to several peculiar 

 species. 



BOMBUS TETRACHROMUS Cockerel!. 1909. 



Bomlnis 7iursei, var. tetrachromus Friese,^ is evidently the same 

 thing. The name tetrachromus would be the prior one for the spe- 

 cies, but as Friese suggests, the tetrachromus form is perhaps specifi- 

 cally distinct from nursei. 



BOMBUS BIZONATUS Smith, 1878. 



Kuen Luen Mountains, near Kukiar, East Turkestan, 9.000 feet, 

 July 30, 1894 (W. L. Abbott). One worker. I can not distinguish 

 this in the worker from B. ^ilantoewl Morawitz, from Pjatigorsk, 

 N. Caucasus (Skoinikov). but in tlie female hhonatus has longer 



^Deutsch Ent. Zelt., 1918, p. 85. 



