BY THOMAS G. SLOANE. 147 



The median part is often defined on each side from the wings 

 by a ridge, more or less distinct (I have made but little use of 

 this feature, though these ridges seem not without value for 

 diagnostic purposes). 



Tlie s\cpra-antenncd platen ("grandes ailes " of Putzeys) are the 

 "frontal plates" (Horn) of the head under which the antennae 

 are inserted. 



The elytra have the striiu at the base either (a) all free, or [h) 

 the four inner free, the fifth uniting with the sixth, or (c) the 

 three inner free, the fourth uniting with the fifth at the base. 

 These variations are of great classificatory importance and seem 

 to offer the most i-eliable means of grouping the species into 

 primary divisions. The first stria of the elytra rises in an 

 ocellate punctui'e at the base, and in some species, especially the 

 larger ones, the first and second striae unite at the base; some- 

 times a short scutellar striole is very noticeable at the base of the 

 first intei'stice (this is an important feature). The interstices 

 vary, the eighth usually forming a narrow carina near the apex. 

 A suhmarginal humeral carina is generally present at the humeral 

 angles; when present it may vary in length and prominence and 

 may be formed by the basal part of (a) the seventh interstice, 

 (6) the eighth interstice, or (c) the seventh and eighth together. 

 The position of the posterior puncture of the third interstice 

 varies; but, though "useful when comparing specimens, I have not 

 used it in my descriptions. 



The presternum may be divided into the pectoral part and the 

 iatercoxal part: the point of union between these parts varying in 

 width, five different degrees of width may be used; (a) very loide 

 ( C. procera, Putz , &g.), (b) ivide (G. lepida, Putz., &c.), (c) narron- 

 (C. australasice, Bohem., &c.), ('•/) very nari-oio (G. obliquata, 

 Putz., »fec ), (e) attenuate (C. nielanopyga, Putz., &c.). The 

 difference in width of the intercoxal part antei'iorly is of 

 high classificatory importance and of the greatest assistance 

 in arranging the Australian species. The pectoral part is some- 

 times margined on each side posteriorly by a prominent border; 

 these may be termed the pectoral ridges (vide C lepida). The 



