348 Mr, G. J. Arrow on a Cmitribution to the 



possibility of mistake wlicn the two forms are seen to- 

 gether. They are extremely similar, but (listiugiiishublo 

 at once by the strongly punctured elytra of 2\ Murtahani, 

 which has two d(juble series of punctured striae, with 

 similarly jnmctured interstices, whereas in the new species 

 these are only impressed unpunctured lines, except at the 

 extreme base. The posterior angles of the prothorax are 

 also more obtuse in the male of T. ntomjol, and in well- 

 developed specimens the posterior elevation is nuiro hol- 

 lowed out in front, the sides being sharply carinate. The 

 average size is distinctly less. 



T. monf/ol appears to have a iiiiich wider area of distri- 

 bution than T. MicHaljani, the latter rantiiu>; westward, 

 while the former ranges eastward, from Burma. 



Tricliogomphns aeuticollis, sp. n. 



T. iitdiKjoli valde affinis et similiter sculpturatuR, setl elytris ad 

 marlines extremes laterales distincte striato-punctatis, prothoracis 

 lateribus arcnatis antice prodiictis, angulis anticis acutis, latitudine 

 maxiino feve ante medium : 



cj, T. nnonijuli similiter armatn, sed in-othoracis elevationo pustica 

 vix bicuspidata, fere acuminata. 



Lonj^. 38-45 mm. Lat. max. 20-24 nnn. 



Hah. TenASSERIM : Dawnat Range, 1,500 ft. 



Two male specimens of this were collected and presented 

 to the Museum by the late Lord ])ormer. It very closely 

 resembles the two species just referred to. It has the 

 smooth elytra of T. rnQngol, but in addition to similar 

 Avell-pnnctured areas at the base and aj^ex of each there 

 are two or three lines of punctures at the extreme lateral 

 margin, which are scarcely visible in that species. The 

 principal difference, however, is in the shape of the pro- 

 thorax, which has not at all the quadrate form which is so 

 marked a feature of T. Martahani and T. mongol, but has 

 the lateral margins produced in front, making a forward- 

 directed angle. The sides are more regularly curved 

 behind and the widest part of the prothorax is at the 

 miildle instead of behind it. The scutellum is very scantily 

 punctured. 



These differences will probably serve to distinguish both 

 sexes, but I have not seen the female. In the well- 

 developed male the prothorax is very strongly lobed 



