348 Mr. G. J. Arrow on a Contribution to the 



possibility of mistake when the two forms are seen to- 

 gether. They are extremely similar, but distinguishable 

 at once by the strongly punctured elytra of T. Martabani, 

 which has two double series of punctured strise, with 

 similarly punctured 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. iiiongol, and in well- 

 developed specimens the posterior elevation is more hol- 

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

 average size is distinctly less. 



T. m.ongol appears to have a much wider area of distri- 

 bution than T. Martahcmi, the latter ranging westward, 

 while the former ranges eastward, from Burma. 



Triclio gamp] ins oxuticollis, sp. n. 



T. mongoli valde affinis et similiter sculpturatus, sed elytris ad 

 marlines extremes laterales distiiicte striato-punctatis, prothoracis 

 lateribus arciiatis antiee productis, angulis anticis acutis, latitndine 

 maximo fere ante medium : 



(^, T. 7nongoU similiter armato, sed prothoracis elevatione postica 

 vix bic'uspidata, fere acuminata. 



Long. 38-45 mm. Lat. max. 20-24 mm. 



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



Two male specimens of this were collected and presented 

 to the Museum by the late Lord Dormer. It very closely 

 resembles the two species just referred to. It has the 

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

 well-punctured areas at the base and apex 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. Martabani 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 

 middle 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 



