270 Mr. G. J. Arrow on LamelUcorn Beetles 



liis females, and not unnaturally supposed the presence or 

 absence of this tubercle to denote the male and feuuile of his 

 " Heteronychufi lucidns.'" 



Tiie two following West Australian species are quice dis- 

 tinct from any hitherto described : — 



Isodon glaher, sp. n. 



Piceus, capite et elytris, vel siiperficie dorsali tota, soepe nigris, 

 pectore et pedibus longe fulvo-pilosis ; brevis et latus, parum 

 convexus, glaber, vix puuctatus ; capite attenuato, apice anguste 

 truncato, fortiter reflexo, carina sutnrali fere recta ; pronoto 

 fere duplo latiori quam longiori, lateribus fortiter arcuatis, 

 angulis auticis fere rectis, posticis toto obsoletis, antice medio 

 breviter impresso et tuberculato, basi utriiique impresso ; scu- 

 tello lato, obtuse angulato ; elytris stria suturali profunda 

 aliisque indistinetis, punctis nonnidlis subapicalibus ; pygidii 

 medio nitido, lateribus dense punctulatis ; utriusque sexus 

 pedibus simplicibus : 



J , tarsis et uuguibus simplicibus. pronoto medio fortius impresso ; 

 pygidio valde convexo : 



5 , corpore minus parallelo, pronoto antice angustato ; pygidio 



parum couvexo. 

 Long. 9'5-12 mm. ; lat. max, 5-5-7 mm. 



Hah. W. Australia : Perth, Cannington, Cottesloe 

 Beach. 



Specimens in the British Museum were taken long ago by 

 Duboulay, and it has more recently been foand by Mr. G. E. 

 Bryant. 



It is a small insect closely resembling /. lajvigatus, Burni., 

 but rather smaller and still smoother above. The head is 

 almost or wholly smooth, tiie clypens is strongly produced in 

 front, with concave sides, the clypeal carina is straight and 

 sharply elevated, and the elyfral striae have almost entirely 

 disappeared, except the deeply impressed one on each side of 

 the suture. 



Isodon subopacus, sp. n. 



Supra toto niger, parum nitidus, subtus piceus, pectore et pedibus 

 dense fulvo-pilosis ; brevis, latus, sat convexus ; clypeo fere im- 

 punctato, attenuato, antice anguste truncato, reflexo, carina 

 suturali recta, valde elevata, fronte leviter punctate ; pronoto 

 impunctato, antice medio minute tuberculato, longitudinaliter 

 impresso, lateribus fortiter arcuatis, antice approximatis, angulis 

 anticis acutis, posticis obsoletis, basi utrinque fortiter impresso, 

 Bcutello la3vi ; elytris fortiter seriato-punctatis, stria suturali 

 profunde incisa ; pygidio nitido, basi crebre minute punctate; 

 utriusque sexus pedibus simplicibus: 



J , pronoti sidco antice paulo dilatato, pygidio convexo. 



Long. 11-13-0 mm. : lat. max, G-5-7-0 mm. 



