HO F. H. Gravel.v. 



witli the other, and have not been able to find any constant difference 

 between them. On the other hand, as soon as the mandibles were opened. 

 a very marked difference became apparent between specimens from the 

 Moluccas, western Dntch New Guinea and British New Guinea, and those 

 from north (eastern) Dutch New Guinea, German New Guinea (with one 

 exception), New Brittain, and the Salomon Islands. The specimens before 

 me include one collected by VON Rosenberg in Amboina, as was also 

 the type of 0. pumilio (Kaup), specimens of the same species determined 

 by KUWERT as 0. pumilio, and specimens of the other species determined 

 by KüWERT as 0. minimus, the latter behig presumably co-types. So 

 there can be no doubt as to the identity of the two species, which may be 

 distinguished thus ; — 

 1. Anterior lower tooth of both mandibles distinct and well developed. 



0. minimus, KüWERT, 1898, p.313. 



- Anterior lower tooth of left mandible abseilt, that of right mandible 



fused at base with lowest terminal tooth . . O.jnimüio (Kaup), 187 1 , p. ">(>. 



Omegarius minimus, Kuwert. 



Redescribed from a fine series of specimens from New Brittain 

 (N. -Bucht in Squally Island, Herbertshöhe in Matufi, and Gazelle Pen- 

 insula) from German New Guinea (Stephansort in Kaiser- Wilhelms-Land ) 

 and from the north of (eastern) Dutch New Guinea (Pauwi and Samberi). 

 There is also, in the collection of the Berlin Kgl. Zoologisches 

 Museum, a Single specimen from Timput in the Solomon Isles, which 

 may perhaps belong to a distinct local race. But it so closely resembles 

 some members of the Squally Island series (Hamburg Museum collection) 

 that I cannot be sure of this without seeing fiirther specimens from the 

 same locality. 



Length 18,5 — 25,5 mm. The anterior margin of the labrum is 

 slightly concave; the sides are straight and parallel; the angles are rounded. 

 and the left one is somewhat more prominent than the right. The 

 mandibles are symmetrical ; the upper tooth of each is small and blunt, 

 sometimes obsolete; the remaining teeth are all distinct, simple and well 

 developed. The lateral parts of the nientum are punctured throughout; 

 the scars are of the form characteristic of the genus, and are a little 

 variable in detail. The upper surface of the he ad is polished, and is 

 usually punctured in the hollows in front of the parietal ridges, but may 

 be entirely unpunctured. Both the outer tubercles are triangulär in section. 

 and trnncate distally, being terminated by tliree small denticles of which 

 the uppermost is longer and sharper than the two lower, while the inner 

 one of the latter is sometimes obsolete; the left outer tnbercle is slightly 



