Royal Physical Society. 147 



Not having seen this species in nature, I have merely copied 

 the description of Kraatz. In size it is a third larger than the 

 following species ; but although that of itself would not be suffi- 

 cient to constitute it a distinct species, the differences in the 

 structure and proportion of the joints of the antennae are too 

 great to allow us to hesitate in according it a place as such. 

 The principal differences in these proportions have been printed 

 in italics in the respective descriptions of the antennae of these 

 species. 



53. C. sericeus, Fabr. 



Catops sericeus, Fabr. Syst. El. ii. 564. 2 ; Erichs. Kaf. d. M. Br. i. 243. 16 ; 



Sturm, Deutschl. Fn. xiv. 43. 22. t. 278. f. d. D ; Heer, Fn. Helv. i. 



384. 21 ; Redt. Fn. Aust. 143. 1 ; Kraatz, Stett. Ent. Zeit. xiii. 442. 



34 ; Fairm. & Laboulb. Fn. Ent. Fr. i. 305. 21. 

 Helops sericeus, Panz. Fn. Germ. /3. 10. 

 Ptomaphagus truncatus, Illig. Mag. i. 42. 4. 

 Catops tmmcatus, Gyll. Ins. Suec. i. 279. 3. 

 Ckoleva villosa, Latr. Gen. Crust, et Ins. ii. 29. 5 ; Spenee, Linn. Trans, xi. 



152. 12. 

 Mycetopliagus picipes, Kug. Schneid. Mag. 558. 9. 

 Mordella silphoides, Marsh. Ent. Brit. i. 493. 19. 

 Var. minor. Catops sericatus, Chaud. Bull, de Mosc. 1845, no. 3. 199. 



Obion go-ovatus, niger, fusco-sericeus ; antennis Fig. 47- 

 brevioribus, nigro-piceis, ad basin ferrugineis ; 

 thorace elytrisque transversim strigosis, his 

 apice truncatis. 



Long. 1-1J lin, 



Oval, a little depressed above, of a deep 

 blackish-brown, very silky. Antennae about as 

 long as the thorax, perceptibly thickened towards 

 the extremity; first joint twice as long as the second; second 

 and third nearly equal in length and thickness ; fourth and fifth 

 nearly equal in length, each shorter than second or third; sixth 

 about the same length as fifth, but decidedly broader, twice as 

 long as eighth, and not so broad; seventh a very little longer and 

 much broader than sixth ; eighth less than half as long as seventh, 

 and scarcely less broad ; ninth and tenth each about the same length 

 as seventh, but broader ; eleventh more slender and half as long- 

 again as tenth, and only commencing to be acuminate past its 

 middle; the apex obtuse, reddish-brown, lighter at the base, 

 deeper at the apex. Head black, large, finely punctate. Thorax 

 shining black, finely transversely wrinkled, a little broader than 

 long, somewhat narrowed in front ; posterior angles pointed, pro- 

 jecting backwards, which makes the posterior margin broadly 



