114 Memoirs of the Indian Museum. [Vol. VII, 



Polynesian form of L. bicolor. The specimens before me, however, show the extent of this 

 colouration to be extremely variable ; for in one of the Humboldt Bay species it covers 

 about a half and in the other about a third of the whole area, while in a third specimen from 

 New Guinea it is confined to a somewhat indistinct patch between the shoulders and in the 

 fourth it is entirely absent. The chief characteristics of the species, apart from colour, 

 are its extreme flatness, the fineness of the marginal grooves of the pronotum, and the 

 almost entire absence of punctures from the pronotum and metasternum. The frontal 

 ridges extend outwards and slightly forwards, to end somewhat abruptly at a considerable 

 ■distance behind the outer marginal tubercles. 



Leptaulax sambawae, n. sp. 



Four specimens from B. Aroe Hassa, Sambawa, 2,000-5,000 ft., and two from Poera 

 Allor Islands, 3,000-4,000 ft. Length 24-27 mm. 



This species differs from L. bicolor only in having the pronotum somewhat less 

 distinctly rectangular in shape, and entirely unpunctured except somewhat indistinctly in 

 the scars and still more indistinctly in the marginal grooves ; in having the punctures on 

 the posterior intermediate areas of the metasternum more or less obsolete ; and in having 

 the elytra distinctly wider behind than in front with their lateral grooves much less strongly 

 punctured. The abdominal sterna are polished and are entirely unpunctured in two 

 specimens, the terminal segment being marked in others with hair-bearing punctures. 



Leptaulax barbicauda (Zang). 



Lept autocides barbicauda, Zang, 1905a, pp. 164-165. 



Several specimens from the Malay Peninsula, (Gap, ca. 3,000 ft., Selangor-Pahang 

 boundary) submitted by Mr. C. Holman Hunt. Length 27-30 mm. 



This species is transitional between L. sambawae and L. bicolor, and is so near the latter 

 most variable species that I have some hesitation in regarding it as distinct. It is, however, 

 distinctly bigger, with large and strongly rectangular pronotum, the general appearance 

 of the insect consequently resembling that of L. dentatus. The puncturing of the pronotam 

 and metasternum is weaker than is usually the case in L. bicolor, tending to resemble rather 

 that found in L. sambawae ; there are always, however, a few punctures in the anterior 

 angles of the pronotum, and the punctures in the pronotal scars and on the posterior 

 intermediate areas of the metasternum are somewhat stronger. 



Leptaulax bicolor (Fabricius). 



Passalus bicolor, Fabricius, 1801, p. 256. 



Leptaulax bicolor + var. vicinus, Gravely, 1905c, pp. 257-259 and 307-309. 



Numerous specimens, including one or more from each of the following localities : — 

 Ceylon (Belihul-Oya) ; Parambikulam, Cochin State, 1,700-3,200 ft. (collected by myself) ; 

 Santi Koppa, N. Coorg (presented by Mr. T. Bainbrigge Fletcher) ; Tukvar, Darjeeling 

 District ; Pashok, Darjeeling District, 2,000 ft. (collected by myself) ; Margherita, Assam ; 

 Port Blair, Andamans (collected by Mr. S. W. Kemp) ; Tonkin (Nape, Thadua, Chapa, 

 Hoabink, and Xieng Khouang, submitted by M. Vitalis de Salvaza ; and Cape Fouquet, 

 submitted by M. Guy Babault) ; Siam ; Perak, Malay Peninsula ; Gap, 3,000 ft., 



