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



Labienus inaequalis, n. sp. 



Figs. XIV, 1 and XV. 1. 



Two specimens from Hattam, Arfak, Dutch New Guinea. Length 37*7-38-7 mm. 



This species is closely allied to L. trigonophorus, from which it differs in the following 

 particulars only. The anterior margin of the labrum is more strongly concave. The 

 primary scars on the mentum are much smaller, and the secondary ones much larger, the 

 latter almost meeting in the middle line immediately in front of the posterior margin. The 

 general surface of the head is less rugose than in L. trigonophorus, and the left outer tubercle 

 is much larger and more definitely directed inwards ; the frontal ridges are obsolete in front 



Fig. XIV. 



Labienus spp. ; specific characters in the upper surface of the head x 4. 



1. L. inaequalis, Gravely. 3. L. ptoxoides, Gravely. 



2. L. dohrni (Kuwert). 4. L. compergus (Boisduval). 



of the inner tubercles. The anterior angles of the prothorax are somewhat more obtuse ;. 

 the median groove is complete. The posterior intermediate areas of the metasternum are 

 almost unpunctured as well as being hairless ; the lateral areas are thickly punctured and- 

 hairy as in L. trigonophorus, their surface being on the same level as that of the intermediate 

 areas, an abrupt change of level occurring only where they touch the central area. 

 Neither in L. trigonophorus nor in L. inaequalis are the elytra united. 



Labienus dohrni (Kuwert). 



Fig. XIV, 2; also pi. 1. 

 Aurelius dohrni, Kuwert, 1898, p. 326. 



Four specimens from Dutch New Guinea, three being from Hattam, Arfak, and one 

 from Kapaur. Length 42-47 mm. 



This species is easily recognized by the small free forwardly directed apex of the central 

 tubercle and the absence of inner tubercles. The frontal and parietal ridges are obsolete 

 or absent. The outer tubercles may be simple and symmetrical, or the left one may be 

 more or less distinctly double ; the anterior margin of the head is usually more or less rough 

 between them, this rough area being separated from the rest of the head by a fine ridge 

 or groove. 



The pronotum is much broader behind than in front ; its median groove is indistinct ;. 

 it is without punctures except in the posterior angles (including the true scars, though 

 other unpunctured depressions may be present near them), which are densely hairy 

 and punctured. The scutellum bears two longitudinal lines of fine punctures. The 

 mesothoracic episterna are punctured except in the posterior angles. The mesosternum 

 is smooth and polished ; its scars are distinct, but very small and less close to the margin 

 than usual. The metasternum resembles that of L. trigonophorus. The grooves of the 

 elytra are deep but unpunctured. 



