30 



MATERIALS TOWARDS A HISTORY 



The following tabic is intended approximately to indicate the proportion of species 

 contained in a selection often European and American genera. 



Mallodon, 

 I'rionus, 

 Elafhidion, 

 Callidium, 

 Clytus, 

 Dorcadion, 

 Oberea, . 

 Toxotus, . 

 Pachyta, . 

 Leptura, . 



1 



G 



15 



6 



4 



o 

 o 



>** 

 i 



i 'i 



1j 



C. Drit. 



I 



5 









 o 



4 

 18 



Mass, 



o 



13 



8? 



Penna 







8 



4 



13 



5 

 4 



5 



8 



PRIONIDiE. 



MALLODON, Serville. Ann. Ent. Soc, France, i. 176. 



1. M. melanopus, Lin. Fabr. Syst. El., ii. 264. Drury, i., pi. 38, fig. 2. 



Head thickly pitted above, a deep, transverse groove behind the clypeus; mandibles remarkably robust, carinate 

 above and laterally : prothorax obsoletely denticulate, and subparallel laterally, flattened and minutely punctured 

 above, except along the otherwise absent dorsal line, on each side of which, before the middle, is a large, slightly 

 elevated, smooth facet, sparsely covered with larger punctures than those of the general surface, and bounded 

 anteriorly by a transverse indentation; a larger longitudinal indentation (narrowest before) lies near the outer mar- 

 gin, bounded, exteriorly by a short, smooth, elevated line having a few punctures, and interiorly by a longer one, 

 which extends backwards and inwards towards the posterior margin. 10 — 18'" long. 



All the North American species of this tropical form appear to be confined to the 

 southern states. 



2. M. simplicicolle, Dupont. Dej. Cat. 



Dark castaneous, approaching to black: head thickly punctured, except along the impressed frontal line; man- 

 dibles not remarkably prominent, ecarinale and thickly punctured above, a strong tooth near the tip: prothorax 

 narrowing anteriorly, finely denticulate anteriorly; dorsal line impressed; upper surface rather regular, with 

 numerous small, scattered punctures, becoming scabrous laterally, and having a slight ridge in the posterior angles, 

 and a short, impressed line posteriorly, converging towards the margin of the scutel: scutel polished, medial line 

 impressed anteriorly, with an irregular row of submarginal punctures. 2" long. 



Vaii. bi-imprcssum. Bears a close resemblance to the preceding, but differs in having a shallow impression, 

 with an included posterior indentation between the eyes and frontal line; pronotum with the dorsal line indistinct, 

 a shallow fovea before the middle, and nearer to the dorsal line than to the outer margin, bounded exteriorly by 

 an irregular row of large punctures, posterior to which there is a small fovea; posterior impressed lines wanting: 

 nictasternum clothed with short, prostrate hair. 18'" long. 



This may be the male of simplicolle. The characters arc drawn from a single speci- 

 men in the cabinet of the Reverend Dr. Morris. 



' Monoleima, Say. 



