SILPHID.*]. 



91' 



Body more slender. Thorax in both sexes 

 narrower than elytra ... 6 



6. Size larger, 4i-5i mm. Elytra convex, 



falling oii' more sti'ongly towards apex. 

 Thoi-ax with posterior angles strongly 

 produced, base plainly sinuate on each 

 side ........ 



Size smaller, 3-4 J mm. Elytra less con- 

 vex, falling off more giadually towards 

 apex ....... 7 



7. Thorax with posterior angles produced, and 



base sinuate at each side (but not as sti'ongly 

 as in nigricans). Anterior tibije of male with 

 a hump-like dilatation on inner side . 

 Base of thorax almost straight ; posterior 

 angles right angles. Anterior tibise of 

 male without a hump-like dilatation . 8 



8. Anterior femora of male with a small knob 



on inner side before middle 

 Anterior femora of male without knob 9 



9. Head moderately finely and very closely 



punctured ...... 



Head strongly, and not so closely, punctured 



10. Last joint of antennee only slightly shoi^ter 



than the two preceding together 

 Last joint of antennse much shorter than the 

 two preceding together . . .11 



11. Eighth joint of antennae only slightly shorter 



than sixth ; body oblong .... 

 Eighth joint of antennae only about half as 

 long as sixth ; body shorter 



NiGRicAxs. Spence. 



FULIGINOSA, Er. 



CORACINA, Kdl. 



NIGRITA, Er. 



MORio, Er. 



CHRYSOMELOIDES, Ps 



LONGULA. Kell. 



TRISTIS, Pz. 



We have added the difi'erences between C. vxdsoni and fumataf 

 which appear to be alternately considered as separate species or 

 varieties of one species. 



I. Posterior angles of thorax right angles, not 



projecting; antennas with the fourth to the 

 sixth joints short, and plainly transverse ; 

 punctuation of the upper side a little 

 coarser and less thick ; pubescence lighter 

 brown ....... 



II. Posterior angles of thorax not right angles, 



somewhat projecting ; antennae with at 

 least the sixth joint large and not trans- 

 verse ; punctuation of the upper side finer 

 and thicker ; pubescence darker brown 



C. wATsoNi, Spetice. 



C. FUMATA, Spenxie,. 



