1914-] F. H. GravEIvY : An Account of the Oriental Passalidae. 241 



Macrolinus nicobaricus, n. sp. 



PI. xiii^ figs. 40-40«. 



9279-81 51B-7 6430-2 



,. / 16 U \ 



^ 6451-2 9846 /. , , / 



\^ 9847-50 j 



Regd.No./ \ ß 14 \ Nicobar Islands 



f F. Stoliczka, 



( F. A. de Roepstorff. 



«» Rangoon' ? 



Description. — Length 30-36 mm. Labrum transverse; symmetrical or with left 

 angle slightly more prominent than right; sides approximately parallel, angles 

 rounded, anterior margin- straight or slightly excavate. Lamellae of antennae of 

 moderate length, the three proximal ones distinctly shorter and stouter than 

 the three distal ones. Mandibles with upper tooth distinct ; ventral terminal tooth 

 smaller and set further back than the other two ; anterior lower tooth simple, 

 conical, acute, that on the right side very little smaller than that on the left. 

 Mentum punctured and sparsely hairy along posterior border between inner limits 

 of scars, but not behind their posterior limits (i.e. not between either scar and 

 posterior margin) ; this puncturing rarely extended forwards on to remaining part of 

 surface of median area to any extent. Head closely and somewhat rugosely punctured, 

 clothed with fine hair ; parietal ridges extending straight outwards or very slightly 

 backwards from central tubercle, from which they are usually separated ; frontal ridges 

 enclosing an acute angle, then curving rapidly outwards and then again forwards; 

 inner tubercles joined to one another by a curved ridge whose concave side faces 

 forwards; these tubercles joined to outer tubercles by ridges enclosing a smooth and 

 unpunctured area ; outer tubercles truncate or imperfectly forked at apex in profile ; 

 anterior angles of head containing more than 120°; canthus rounded externally; 

 posterior rounded portion of supra-orbital ridge meeting outer wall of hollow anterior 

 portion in angle of not more than 120°, inner wall of anterior portion usually as 

 distinct as outer wall. Pronotnm with marginal grooves incomplete across the 

 middle before and behind ; median groove absent or scarcely distinguishable ; a small 

 depression present as a rule near anterior angles, usually containing (sometimes 

 replaced by) two punctures (very seldom a small cluster) which often coalesce to 

 form a short oblique groove; scars rounded, or linear and oblique, punctured, hairy; 

 surface between scars and marginal grooves likewise punctured and hairy. Lateral 

 plates of lower side of prothorax smooth towards inner side both in front of and 

 behind coxae ; outer border punctured and hairy, especially behind. An indistinct 

 median groove sometimes present on scutellum; mesothoracic episterna punctured 

 except in posterior angle and along ventral border, punctured area bordered by a 

 roughened band, the rest polished. Mesosternum with usual anterior marginal striato- 

 punctate area often followed by a few coarse punctures ; scars strongly impressed, 

 their surface finely roughened, this roughness being continued more or less over 

 the outer angles of the plate ; central area more or less polished with exception of a 



1 I find by looking up the register that this record is of doubtful authenticity; it appears to be the 

 only record of the species outside the Nicobars and is probably incorrect. 



