The (xeneric characters of Haivaiian Crcchronidm. 14t 



abdomen above closely and evenly punctured, posterior 

 tarsi very short, hardly as long as the tibiae. 

 5 . Mandibles 3-dentate at apex, the post-median tooth of 

 tipper edge wanting, the edge at most a little sinuate, 

 clypeus carinate and the apex rather widely emarginate ; 

 propodeum with a distinct consute groove dividing it from 

 the postscutellum, smooth except for feebly - impressed 

 nearly obsolete punctures and minute surface sculpture, 

 no longitudinal wrinkles, calcaria of hind tibise much 

 bent ; abdomen with 2nd dorsal segment finely and closely 

 punctured, beneath very tightly convex, the jjygidial area 

 long and narrow. 



Melanocrabro, gen. no v. (Type Crahro airtipes P.) 



6. (5) ^. Second ventral segment lightly or strongly convex over 



most of its surface, not inclined at an .angle to the 

 following. 

 $ . Mandibles bidentate at apex, or if 3-dentate then there is 

 a post-median small, but evident, tooth on the upper edge, 

 and the 2nd ventral segment is very strongly convex. 



7. (8) $. Second ventral segment very strongly convex in profile, 



generally more or less tumid ; clypeus somewhat produced 

 in front, its 'middle part subtriangular, somewhat widely 

 truncated at the apex, 6th joint of antennae with a very 

 distinct prominent apical tooth ; post-median tooth of 

 upper edge of mandibles small. 

 9 . Mandibles 3-dentate at apex, with small post-median tooth 

 on upper edge, clypeus somewhat produced and very dis- 

 tinctly emarginate at the apex ; 2nd ventral segment very 

 convex, tumid, or subtuberculate ; pygidial area long and 

 narrow ; eye facets very coarse in fx-ont. 



Ilylocrahro, gen. nov. (Type Crahro tumidoventris, P.) 



8. (7) ^ . Second ventral segment not strongly convex ; if rather 



strongly, then the 6th joint of the antennae is only very 

 feebly or hardly visibly produced below the base of the 

 following ; clypeus with its anterior margin generally 

 widely rounded, sometimes a little sinuate, rarely pro- 

 duced in front ; post-median tooth distinct and sharp, often 

 large. 

 $ . Mandibles bidentate and with post-median tooth of upper 

 edge sharp and well-developed, clypeus often widely 

 rounded at apex ; if somewhat produced it has no distinct 

 emargination ; 2nd ventral segment simple, only lightly 

 convex ; pygidial area triangular, never very narrow and 

 elongate, flat within the carina^, or the middle part ob- 

 TRANS. ENT. SOC. LOND. 1902. — PART 11. (JUNE) 11 



