1914-] F. H. Gravely : An Account of the Oriental Passalidae. 243 



Macrolinus sikkimensis (Stoliczka). 



I. M. SIKKIMENSIS, Stoliczka, s. str. 

 PI. xiii, figs. 42-42«. 

 Regd. No. ^-^ {type) " Sikkim " ' F. Stoliczka. 



fill ^-^ Khasi Hills Shilloug Museum. 



^ Cachar J. Wood-Mason. 



9889^90 ^ Harmutti, base of Dafla Hills \ 



6387;;9 6JU Dikraüg Valley 



'*.!*«.-. O.U, H.H.Godwin-Austen. 



6890 6|42 640,3 9S|i Dafla Expedition 



?5^ Camp 9, Dafla Expedition J 



'■^^ • Kobe, Abor Country, 400 ft. "j 



'^ Janakmukh, Abor Country, 600 ft. )S. W. Kemp. 



^^ Rotimg, Abor Country, 1400 ft. j 



?|^ Naga Hills Moti Ram. 



Description. — Length 25-31 mm. Resembles the two preceding species except in the 

 following respects. Parietal ridges of head on the whole more distinctly connected with 

 central tubercle ; frontal ridges as in M . nicoharicus ; inner tubercles as in M. nicohari- 

 cus, the ridge between them as in M. andamanensis ; outer margin of inner tubercles 

 often produced backwards as more or less distinct ridge over anterior part of head ; 

 posterior part of supra-orbital ridge meeting anterior part in angle of about 120°. 

 Pfonotiim strongly punctured laterally behind anterior extremities of marginal groove, 

 all along this groove at the sides, and usually near the scars also. Mesosternum usually 

 more polished than in M. nicoharicus : with or without a single median roughened or 

 finely punctured area of varying extent in place of the paired areas ; a more or less 

 obscure groove sometimes present in the middle line. Metasternum coarsely punctured 

 in posterior intermediate areas, otherwise as in the preceding species. Elytra slightly 

 hairy at shoulders, their dorsal grooves more or less distinctly punctured; lateral 

 grooves very wide, with strong punctures elongated to form a series of transverse 

 grooves. 



Habits. — Mr. Kemp did not find any large colonies of this species during the Abor 

 Expedition. This agrees with the results of my own more scanty observations on the 

 sub-species found in the Dawna Hills, and I am led to conclude that the species is 

 not a markedly gregarious one. The sub-species tavoyanus seems to live in logs that 

 have reached too advanced a state of decay to be suitable for Aceraius to inhabit; 

 whether this is true of the northern form also has yet to be determined. 



2. M. SIKKIMENSIS, subsp. TAVOYANUS, U. Subsp. 

 Regd. No. I , *, Tavoy Museum Collector. 



( T^ {type) ! 



' Stoliczka tells us in his paper (1873, p. 162) that he collected this specimen " at about 1500 feet, 

 some two miles east of Pankabari." Pankabari is many miles south of the Sikkim frodtier of to-day. 



