Amazonian Prionides. 47 



2. Mallodon hajulus. 



M. hajulus, Erichs. Consp. Ins. Col. Peru. p. 138. 



M. occvpitale, Thomson, Physisj I. p. 93, ?. 



$ . " OblonguSj depressus, fusco-niger, nitidus, ge- 

 narum processu bidentato : prothoracis disco polito, 

 medio serie punctorum obsoletorum longitudinali 

 notatOj lateribus punctato-rugosis, margine obtuse 

 crenulato, angulis posterioribus denticulo acutiusculo 

 terminatis, elytris punctulatis. Long. 1" 5"'." 

 (Erichs.) . 



$ . Mandibulis brevibus, supra et infra grosse punc- 

 tatis ; capite grosse confluenter punctato ; thorace 

 plagis septem elevatis politis, omnibus (exteriori 

 utrinque excepta) basi conjunctis, interstitiis crebre 

 grossius punctatis ; elytris distincte punctatis ; pro- 

 cessu prosternali convexo, vix punctato. 



Eah. — St. Paulo, Amazons. 



I think it extremely probable that M. occipitale, 

 Thoms., from Venezuela, belongs to the same species : 

 specimens before me referable to this species differ only 

 in the finer punctuation of the elytra. Mallodon hajulus, 

 of Erichson, has been generally cited as the $ of Chias- 

 inetes Limce of Guerin, but Erichson^s diagnosis lends no 

 support to such an inference ; the terms " depressus — 

 genarum processu bidentato •'■' being quite inapplicable to 

 Chiasmetes j on the contrary, they fit the present species 

 of Mallodon which I found in the same tract of country 

 where Erichson^s insect was discovered by the traveller 

 Tschudi. M. Thomson makes no mention, in his mono- 

 graph of Mallodon, of the form of the anterior angles of 

 the cheeks, without which it is scarcely possible to give 

 satisfactory descriptions of the species. 



Genus Stictosomus. 

 Serville; Lacord. Genera, viii. p. 144. 



A remarkable genus, distinguished by its oblong-linear 

 depressed form^ long acute mandibles curving downwards 



