106 Memoirs of the Indian Museum. [Vol. VII, 



especially the lateral ones, are distinctly punctured. In other respects this species resembles 



L. j)tox. 



Labienus moluccanus (Percheron). 



Passalus mollucanus, Percheron, 1835, pp. 31-33, pi. ii, fig. 7. 



Numerous specimens from Ceram (Roemasosal-Pasama in the central part, Wahaai 

 in the north, Elpapoeti Bay in the south, Honitetoe in the West), Limtoe in Nusa Laut, 

 Saparua, Hitu and Leitimor in Amboina, Batjan. Length 42-52 mm. 



This species differs from the last only in having the frontal ridges more or less obsolete 



behind the inner tubercles, in having the two processes of each of the outer tubercles less 



distinct (much as in L. ftox and ptoxoides) and in having the elytra united in the middle 



line. 



Labienus gigas (Kaup). 



PL 1. 



Eriocnemis gigas, Kaup, 1868«, p. 23. 



Seven specimens from Batjan, including five from Laboean, one from Halmaheira 

 one from Ternate, and two without locality records. Length 56-64 mm. I am unable to 

 distinguish between L. gigas from Ternate and L. crassus from Batjan. 



The elytra are united as in L. moluccanus, which the present species resembles in all 

 respects, except in having each of the outer tubercles composed of three more or less distinct 

 blunt processes, and in having the posterior intermediate areas of the metasternum, and as 

 a rule the pronotal scars, punctured, though not hairy. 



The species of Labienus known to me may be identified thus : — 



( The secondary scars on the mentum convergent behind, curved 



or straight, not very widely separated as a whole .. .. .. 2. 



The secondary scars on the mentum strongly arched outwards, 



very widely separated as a whole . . . . . . . . . , v 8. 



The outer tubercles simple, conical ; the grooves of the elytra 



punctured . . . . . . . . . . . . . . 3. 



Not as above . . . . . . . . . . . . . . 4. 



f The left outer tubercle scarcely longer than the right ; the 



] mentum with primary scars . . . . . . L. trigonophorus (Zang) 1 . 



j The left outer tubercle much longer than the right ; the mentum 



(_ without primary scars . . . . . . . . L. inaequalis, p. 104. 



( The central tubercle free apically . . . . . . L. dohrni, p. 104. 



4 < 

 ( The central tubercle not free . . . . . . . . . . 5. 



__ Ç The outer tubercles long and simply truncate . . . . L. glaber (Gravely) 1 . 



(. The outer tubercles much shorter, not simply truncate . . . . . . 6. 



Both outer tubercles composed of two blunt denticles ; the scars 



of the pronotum without punctures or hair . . . . L. im/par (Kuwert). 1 



q-{ The inner denticle of the right outer tubercle more or less 



obsolete ; the scars of the pronotum with hair-bearing punc- 



v, tuxes . . . . . . . . . . . . . . 7. 



1 See Gravely, 1913, for figures of these species. 



