284 DTNASTIN,!:. 



254. Trichogoinphus acuticollis. 



Trichogouiplms acuticollis, Arrow* Trans. Ent. Soc. Lond.j 1908, 

 p. 346. 



Size and general appearance of the preceding species, but the 

 elytra are each decorated with a strongly impressed sutural stria, 

 two or three lines of punctures at the lateral margin, some 

 irregular punctures at the base and a closely and irregularly 

 punctured area at the apex. The scutellum is very scantily 

 punctured. 



(S . The head is armed with a moderately long, slightly re- 

 curved, laterally compressed horn. The sides of the prothoraxare 

 obliquely produced in front and the anterior angles directed 

 forward. The sides are more regularly curved behind than in 

 2\ martahani and T. monrjol and the widest part of the thorax is at, 

 or a little before, the middle, instead of behind it. The base is 

 very strongly lobed behind and elevated into a hump, which is not 

 broadly forked in front but bluntly pointed, the point showing 

 only a trace of bifurcation. 



In a male specimen of minor development the armature is 

 reduced to a condition almost indistinguishable from that of 

 similarly undeveloped examples of T. monrjol. 



The female is unknown. 



Lenrith 38-45 mm. ; breadth 20-24 mm. 



Tenasserim : Dawna Eange, 1500 ft. 



Type in the British Museum. 



Genus DICHODONTUS. 



Dichodontus, Burmeister, Handh. Ent. v, 1847, p. 217; Lacord., 

 Gen. Culeopt. iii, 1856, p. 436. 



Type, Dichodontus coronatus, Burm. 



Tlanrje. Burma, >Siam and the Malayan Region. 



Generally smaller than 7Vu7«o7o»i2)A«s, compact and very convex. 

 Clypeus tapering, truncate at the apex. Mandibles bluntly bi- 

 dentate at the extremity and furnished with a very prominent and 

 exposed rounded lobe at the outer edge. Maxilla armed with 

 three strong terminal teeth and thickly tufted with hairs. Mentum 

 short and tapering. Prothorax generally very wide in the middle, 

 the prosternal process flattened, not erect. Propygidium without 

 stridulating ridges. Legs not long ; front tibia armed with three 

 teeth ; hind tibia truncate ; basal joint of the hind tarsus slightly 

 triangular. 



<S . Head (and sometimes also that of the $ ) armed with a 

 slender horn curving backward. Pronotum (sometimes that of the 

 2 also) broadly elevated in the middle of the posterior part. 

 Pygidium convex, shining and nearly smooth. Last ventral seg- 

 ment smooth and emarginate. 



