152 



hil dilutioribus ; antennis sat brevibus sat robustis ; capite 

 sat piano minus inrequali, pone oculos dentato, supra sub- 

 tilius confertim punctulato ; prothorace quain latiori parum 

 longiori, postice nee antice sat angustato, supra longitudin- 

 aliter late leviter biimpresso, confertim leviter punctulato, 

 lateribus obtuse 6-dentatis ; elytris obsolete punctulato- 

 striatis, interstitiis 5" 7" 9° que manifeste elevatis (ceteris 

 planis obsolete nee seriatim punctulatis). Long., ly^^ 1.; 

 lat., i 1. 

 Near *S'. surinamensk, Linn, and congener, OIL but differing 

 from both inter alia by tlie inner four interstices of each elytron 

 being perfectly flat, and the striae and punctures of the elytra 

 being very feeble throughout (becoming a little stronger, how- 

 ever, near the lateral margin). The general form is much wider 

 and the prothorax much less elongate than in congener. The 

 size is much larger, and the prothorax is notably wider in front, 

 than in surinamensis. 

 ■ Central Australia (Oodnadatta). 



The foUowino; table shows the distinctive characters of the 

 Silvani known to be Australian : — 



A. Elytra with the alternate (or a smaller number of the) interstices 

 evidently more elevated than the others 

 B. The inner four interstices of each elytron quite 



flat ... . . . . ... ... aridulus, Blackb. 



BB. Interstice three conspicuously elevated, 



0. Sulci of pronotum very wide and shallow 



(size larger) ... ... ... ... congener, OUiff. 



CC. Sulci of pronotum notably narrower and 



deeper (size smaller) .. ... ... surinamensis, liinn. 



AA. Interstices of elytra equal (or nearly so) inter se. 

 B. Prothorax not (or scarcely) longer than wide. 

 C. Head dentate behind the eyes ..^ ... monticola, Blackb. 



CC. Head not dentate behind the eyes. 



D, Colour of body entirely black (sides of pro- 

 thorax not crenulate ?) ... ... at r at ulus, Gr. 



DD. Colour of elytra brownish-rufous (sides of 



prothorax strongly crenulate) ... armatulus. Blackb. 



BB.* Prothorax conspicuously longer than wide ... unidentatiis, Fab. 



CRYPTAMORPHA. 



C. op fata. Oil. This species was described on a specimen from 

 Tasmania — a locality from which I have not seen any 

 Cryptamorpha. I do not think it is identical with any of those 

 I have described though it is perhaps near Maclear/i, Blackb. 

 But inter alia Olliff says of its head " coriaceous " implying that 

 there is no distinct puncturation, whereas the head of Macleayi 

 bears numerous not very s-trongly impressed isolated punctures ; 

 nor do I find that the . interstices of the elytra are particularly 



* S. castaneibs, Mad., if a valid species, must be placed here. 



