igi^.] F. H. Gravely : An Account of the Oriental Passalidae. 211 



in an angle of 90° and canthus in an angle of about 120°; external angle of canthus 

 about 90° (sometimes, especially in Cachar specimens, this angle is reduced by 

 an intensification of the concavity in the anterior margin of the canthus) ; apical angle 

 of supra-orbital ridge about 100°, situated above and a little in front of anterior 

 margin of eye ; crest of supra-orbital ridge defined on inner side by a strong groove ; 

 central tubercle distinct, divided by a longitudinal concavity above into a pair of 

 parallel or slightly divergent crests whose front margins are vertical and straight or 

 slightly convex, their upper ones meeting these at an angle of about 90° (usually 

 somewhat less) and being straight or more frequently slightly concave ; hollows at 

 sides of the central tubercle somewhat as in T. bicanthatus but more extended. 

 Prothorax as in T. pygmaeus, but with anterior angles of pronotum a little more 

 prominent and sides approximately parallel. Sciitellum without (cr with very few) 

 punctures other than those usually found on anterior margin ; mesothoracic episternum 

 with broad band of punctures extending obliquely across it; mesosternum more or 

 less smooth, punctured close to lateral margin near the front, usually more or less 

 obscurely grooved or keeled in the middle-line behind, the extent of all these mark- 

 ings being apparently variable and in no way characteristic of specimens from parti- 

 cular localities. Metasternum as in T. bicanthatus. Second and third abdominal 

 sterna finely roughened throughout. Posterior coxae finely roughened behiad ; middle 

 tibiae armed with one more or less strongly developed tooth or spine; hind tibiae with 

 a very rudimentary tooth or unarmed. Elytra with all grooves punctured, the ribs 

 smooth. 



Habits. — Mr. Kemp informs me that this species lives under the bark of moder- 

 ately hard logs in very wet jungle. 



Genus AULACOCYCLUS, Kaup. 



Aulacocyclus andrewesi, n. sp. 



PI. xi, figs lo-ioa. 



Described from a single specimen, collected by Mr. H. L. Andrewes in June from 

 rotten timber in the Anamalai Hills at an altitude of 3500-4000 feet ; now in the 

 collection of Mr. H. E. Andrewes. 



Description.— Length 23 mm. Labrum about twice as broad as long, anterior 

 margin strongly concave, sides convergent behind, angles rounded and prominent. 

 Right mandible missing, the left with upper tooth small but distinct, uppermost of 

 three terminal teeth still smaller, remaining two terminal teeth larger, anterior lower 

 tooth somewhat L-shaped in section, but fused with middle lower tooth to form with 



it a L l-shaped structure with a minute denticle on the connecting ridge. Mentiim 



punctured and hairy, with a smooth anterior prominence in middle which is medially 

 grooved in front. Antennae with first two lamelliform lobes about four times as long 

 as broad. Head above smooth and polished; anterior margin smooth above and 

 hairy beneath, strongly concave in middle, slightly convex and very finely granular 

 laterally, bordered by a strongly marked groove, meeting crest of supra- orbital ridge 



