MACROLTNUS. 263 



from «ide to side, but tlie author later abandoned this name as 

 a synonym of convexifwrn. 



162. Aceraius birmanicus. 



(Jplin/goniiis biniKniioisGraveW,* Mem. Ind. Miis. iii, 1!)14, p. 226, 

 fig. 3 a, pp. 285, 320. 



The six lamella' compo.sinj; the aiiteunal club are exception- 

 ally long, and the difierence between the seventh joint and 

 those which precede it is small. The head is strongly but not 

 very closely punctured, and the frontal area is broad. The left 

 inner marginal process of the head is slender and inclined 

 strongly to the right. The jnonotum has a vestige of a median 

 groove in the basal half and the lateral margiixs are fairly 

 closely and finely punctured, the pinictures bearing erect setse. 

 The mesosie.rnal scars are deej) and opaque, the sides of the 

 metasternnm very broadly and densely punctured and clothed 

 with hair. 



Length, 35 to 37 mm. ; breadth, 13 nnn. 



Burma : l^>\\hy Minea [W. Doherty) ; Kambaiti,N.E. Burma, 

 7000 ft. {R. Malaise, March to May). Malay Peninsula : 

 Perak. 



Type in the British Museum. 



Genus MACROLINUS. 



Macrolinus Kaup, Col. Hefte iii, 1868, p. 18 ; Gravely, Mem. Ind. 

 Mus. iii, 1914, p. 323 ; op. cit. vii, 1918, p. 80. 



Type, Passalus latipennis Perch. 



Range. Ceylon; Indo-Ma la j^an Region ; Celebes. 



Form very various, convex or more or less flattened, elongate 

 and winged or short and wingle.s.s. The club of the antenna 

 consisting of three teiminal lamella> and three supplementary 

 ones, generally short, but sometimes long. The head sym- 

 metrical, the front margin bearing two shaq) triangular 

 processes, the supraorbital ridges short, ending abruptly 

 behind and not united by a posterior ridge. The middle tibia 

 bears scanty hairs or fringes of close but not long hairs. 



The genus is easily recognizable by the absence of a po.sterior 

 ridge uniting the two su])raorbital ridges of the head. 



Key to the Species. 



1 (14) Elytra long, not very convex. 



2 (9) Pronotum without complete 



median groove. 



3 (8) Lateral grooves of the elytra fine- 



ly punctured. 



4 (5) Antenna with six very long lam- 



ella? latipennis Perch., p. 264. 



.5 (4) Antenna with three long and three 

 short lamella?. 



