120 Christmas Island, 



one a little behind the middle of the base, the second behind the 

 middle of the disk, and the third at the beginning of the posterior 

 declivity. Under-side with a greyish pubescence ; legs reddish 

 testaceous, with the thickened part of the femora and the lower 

 half of the tibiae more or less fuscous. First abdominal segment 

 of the male with a tubercle on each side of the middle. 

 One male example, taken April, 1898. 



77. ArsBOcerus, sp. 

 This is one of the forms closely allied to Arceocerus coffece, Fab. 



Family PEIOjSTID^. 



78. Prinobius coxalis, Gahan, sp.n. (PL XI, Fig. 3.) 



Brunneo-testacea, elytris plus minusve fulvescentibus, coriaceis, 

 basi prope suturam sub-asperatis, utrisque lineis quatuor pauUo 

 elevatis, instructis. 



$. Prothorace transverse, supra subtusque confertissime punc- 

 tulato, disco antice plagis duabus triangularibus, sub - nitidis, 

 impresso ; lateribus breviter dentatis postice subparallelis, antice 

 rotundatim paullo convergentibus ; antennis apicem elytrorum 

 jDaullo superantibus, articulo 3" quam 1^ plus duplo longiori, et 

 articulis 4^, 5°, 6° que conjunctis fere sequali ; articulis 3^ 4° que 

 subtus breviter spinosis, articulis 1^ ad 4^"^ supra fortiter sat dense 

 punctatis, articulis 5^ ad 9^^"^ sparsius punctatis, 10" 11° et apice 

 noni longitudinaliter striatis et opacis ; mesosterno, metasternique 

 lateribus et coxis posterioribus nudis, confertissime punctulatis et 

 opacis ; plaga triangulari mediana metasterni nitida sparse punc- 

 tulata et hirsuta, fortiter depressa. 



9. Antennis quam corpore multo brevioribus ; prothoracis 

 lateribus a basi antice convergentibus, sat fortiter dentatis vel 

 spinosis ; disco medio sparse, versus latera dense et rugose, punctate. 



Long. 35-50, lat. 10-14 mm. 



The females of this species offer no very prominent characters 

 by which they may be distinguished from those of several other 

 species of the genus. The third joint of the antennae is relatively 

 long, being nearly equal in length to the three following joints 

 taken together, and is also comparatively slender, as it is not so 

 distinctly thicker than the fourth joint as it is in nearly all the 

 other species. 



The male is readily distinguished by the following characters : — 

 Prothorax transverse, furnished at the sides with very short teeth, 

 and very closely punctured and opaque over almost the whole 

 surface excepting two small triangular sub-nitid and impressed 

 areas placed between the middle and anterior part of the disk. 

 Hind coxae, as well as the presternum, mesosternum, and sides of 



