276 



laying much emphasis on this character on the. strength of a 

 single specimen. Viewed from in front the frontal lamina looks 

 to be a nitid almost punctureless quadrate plate sloping hindvvard 

 and upw^ard from the clypeal carina (which forms its base) and 

 having all its sides sharply defined right lines or nearly so (which 

 is the case also with specimens of 0. Cowleyi having a feebly 

 developed lamina but no other known to me of the group) 

 Viewed from behind the frontal lamina looks like that of the 

 female of the Brisbane species which I take to be 0. pugnax, 

 Har. (vide infra) while in 0. Cowleyi the corresponding lamina 

 looks quite different owing to the upward projection being (in all 

 specimens examined) quite conspicuous. This is the smallest 

 Onthophagus I have seen of this group. 

 N. Australia (Palmerston). 



0. Sloanei, sp. nov. Latus ; robustus ; supra glaber ; subtus 

 f ulvo-hirtus ; opacus (pronoto capiteque leviter subnitido) ; 

 ater, antennis rufo-testaceis ; capite minus lato, ante oculos 

 parum dilatato ; clypeo transversim rugato antice angulatim 

 emarginato ; capitis parte inter carinas crebre fortiter punc- 

 tulata, sutura clypeali carinata in medio leviter angulatim 

 elevata ; oculis ut 0. Cowleyi, Blackb.; prothorace quam 

 longiori ut 11 ad 7 latiori, supra antice retuso, parte retusa 

 sat manifeste sat crebre punctulata, cetera parte grosse 

 fortiter rugulosa postice longitudinaliter vix impressa, parte 

 dorsali media antice carina transversa arcuata (hac in medio 

 profunde sinuata et utrinque tuberculo parvo terminata) 

 marginata, tuberculo sat magno conico utrinque sito, fovea 

 magna laterali fortiter impressa, lateribus angulisque ut 

 0. Cowleyi, sulco laterali marginali trans basin continue in 

 medio subangulato sed vix dilatato, carina marginali laterali 

 trans basin sat fortiter continua ; elytris obsolete (latera 

 versus minus obsolete) crenulato-striatis, crenulis quam striae 

 haud latioribus, interstitiis planis (lateralibus leviter con- 

 vexis) coriaceis (humeris nitidis haud coriaceis) sparsim 

 subtilissime (latera versus magis fortiter) punctulacis ; 

 pygidio coriaceo et metasterno sat fortiter punctulatis. 



Maris carina f rontali quam clypealis vix magis elevata ; tibiis 

 anticis sat elongatis, minus latis extus sat fortiter 4-dentatis. 



Feminte carina frontali sat elevata, utrinque sursum producta ; 

 tibiis anticis minus elongatis, magis latis, extus magis 

 fortiter 4-dentatis. Long., 7— 7f L; lat., 4—44 1. 



To a casual glance extremely like the species called 0. atrox, 

 Har. (above), but differing from it (independently of sexual 

 characters) by the clypeus strongly emarginate in both sexes, the 

 glabrous retuse front of the pronotum, the narrower head (very 



