1873.] F. Stoliczka — Monograph of Indian PassalidcB. 159 



other genus than BasiUanus. They differ from Aceraius by the absence of 

 hair at the sides of the elytra, and from the other genera of the Aceraice in 

 the shape of the lower lip and the want of a scutellum between it and the 

 tongue ; the same character holds good in a comparison with MastachiluSf 

 and the unequal lappets on each of the antennae readily separate them from 

 the other MacroUntB. The seven species may, however, be divided into two 

 sections, as follows : 



a. With the marginal processes of the clypeus very asymetrical, — 

 Nilgheriensis^ incequalis, Cantoris, Bidicus. 



h. With the marginal processes of the clypeus very slightly or 

 scarcely asymetrical, — cancrus, Andamanensis, SiJcklmensis. 



17. Basilianus Nilgheriensis, Guer. 



The usual size of Malabar specimens is only 28 m.m. ; it does not 

 appear to be a common species. 



18. Basilianus iNiEQUALis, Burm. 



Common at Malacca. Kaup gives it from Singapore and Penang. 

 The largest specimen which I have examined is nearly 30 m.m,, and the 

 smallest 24!"7 m.m , the length of the elytra being 13'7, width of head 5'5, 

 of prothorax 6*9, the proportionate size of this last being often remarkably 

 small. 



19. Basilianus Cantoeis, Hope. 



The usual size of Sikkim and Assam specimens is 33 to 35 m.m. Kaup 

 gives it also from Malacca and Cambodja. 



20. Basilianus indicus, n. sp. 



Total length from 33 to 40 m.m., one specimen is 37*6, width of its head 

 9, of prothorax posteriorly 12, of shoulders 11'5, length of elytra 21'5 m.m. 



Left jaw slightly straighter and longer than the right one. Upper lip 

 widely and rather deeply emarginate in front. Antennse, with the three 

 terminal lappets longest and subequal, the second and third about half the 

 length of the fourth, and the first is very short, sometimes scarcely traceable. 

 Clyjjeus rather large, mostly smooth, or sparsely punctated, with the supra- 

 ocular ridges anteriorly truncated with an inward slope, the inner edge of the 

 slope being sometimes very indistinct, while the outer one is sharp, and 

 ))rojects at the corners, somewhat as in Aceraius grandis. Tlie horn rises 

 out of a transverse long tubercle, it is subpyramidal, the posterior slope 

 1)eing gradual, the anterior vertical ; the frontal carinas are very fine, 

 ibrming together a wide semicircle, each terminating in a blunt tubercle, 

 and from each proceeds a very fine carina to the respective marginal process 

 of the clypeus ; the left process is the longer, depressed, inwardly bent, 

 obtuse at the end ; the right one is thick, short, obtusely pointed. 



