1914.] F. H. Gravely : An Account of the Oriental Passalidae. 225 



whole tubercle an appearance of being pointed and directed more or less straight 

 forwards; right outer tubercle of more or less similar (sometimes the same) shape, but 

 shorter (although longer than in the two preceding species), apex simply pointed 

 in profile, its ridge from inner tubercle directed slightly outwards; no transverse 

 groove between inner tubercles and supra-orbital ridges ; ^^upra-orbital ridges with 

 more or less peaked apical angle of about 120°, inner wall of anterior excavation 

 very rarely suppressed; anterior angles of head containing about 120°, not pro- 

 minent. Pronotum almost invariably punctured and hairy to some extent in the 

 posterior angles and on the sides, prothorax beneath much as in Episphenus neelgher- 

 riensis. Scutellum entirely smooth, hairless, unpunctured, and highly polished with 

 exce]3tion of usual patch in middle of anterior margin ; mesothoracic episterna polished 

 throughout, punctured above and close to anterior margin; mesostermim smooth and 

 highly polished throughout or matt in the lateral angles ' , scars entirely absent or 

 (rarely) indicated by a pair of slight depressions of the usual shape in the usual position 

 Metastemum with central area very vaguely defined; posterior intermediate areas 

 unpunctured except along posterior margin ; lateral areas broadened behind by the 

 curvature of their inner borders. Abdominal sterna and posterior parts of hind coxae 

 as in Episphenus neelgherriensis , often still smoother. Elytra with small tuft of 

 hair at shoulders, grooves more weakly punctured throughout. 



2. O. CANTORi, subsp. coNVExiFRONS, Zang. 



Regd. No. ^^ Khasi Hills, Assam H. H. Godwin-Austen. 



"^^^^ Teriagbat, Khasi Hills H.H.Godwin-Austen. 



In the British Museum collection there are two specimens from the Ruby 

 Mines District of Burma. 



Description. — Length 27-29 mm., otherwise as in 0. cantor i, s. str. The difference 

 in size is an extremely small one, but appears to be constant in specimens from the 

 Khasi Hills and Burma. One of the specimens from the Rubv Mines has the mentum 

 sculptured ?lmost as in the following sub-species. 



3. O. CANTORI, subsp. DUNSiRiENSis, n. var. 



PI. xi, fig. 23. 



Regd. No. --ff (type) ''^ Dunsiri Valley, Assam H. H. Godwin-Austen. 



Description. — Length 28-31 mm. Resembles the two preceding forms in all respects 



except the following : posterior wall of depression of anterior margin of central part 



of mentum continued straight outwards for a short distance on to surface of lateral 



areas, then turned suddenly backwards, extending more or less distinctly to posterior 



lateral angles, this final portion of the wall being occasionally so formed as to produce 



a false superficial semblance of the scars found in the genus Macrolinus. 



' Apparently always polished throughout in Darjeeling specimens. 



