Genus Dorysthenes, 515 



cundo brevlssimo subhaemisphaerico, tertio longissimo subcylin- 

 drico, caeteris ad penultimam inclusam gradatim breviscentibus 

 subtrigonis apice cyathiformibus, ultimo subelongato, processu 

 ovali brevi, Iridecimum articulum fere repraesentante, ad apicem 

 instructo. 



MandibulcB graciles, porrectae, subelongatae, ad basin tuberculo 

 subeminenti, denteque parvo acuto instructae, per reliquam longi-. 

 tudinem iuermes, subtrigonae, intus incisorias, compressissimae^ 

 paululum arcuatae. 



Palpi maxillares quadriarticulati ; articulis tribus primis sub- 

 cyliudricis subcompressis apice crassioribus, primo et tertio fere 

 aequalibus subbrevibus, secundo longiori, quarts, securiformi : la- 

 biales triarticulati ; articulis duobus primis subcylindricis sub- 

 compressis apice crassioribus, primo subbrevi, secuado longiori, 

 tertio subbrevi securiformi. 



. Pedes medlocres, femoribus tibmqne valde compressis. 



Corpus subelongatum, subcyiindricum. Collum productum. 

 Thorax subrhomboideus, ad latera unidentatus, marginibus acutis 

 compressis. Sternum forte, in spinam validara productum. 



This form stands conspicuously distinct from any other that I 

 have hitherto observed in the family of Prionidce, Its somewhat 

 lengthened and subcylindrick body, its elongated neck, its slen» 

 der porrected and unarmed mandibles, and above all its armed 

 sternuniy produced into a strong and acute spine, offer characters 

 which call for a separate station and title in the family. The 

 Prionidce are at present in such confusion, little having been 

 done to subdivide or regulate the various and strongly marked 

 groups which are still included in the genus Prionus^ that it is 

 impossible at present to point out the affinities of Dor^stheneSy 

 or to ascertain its relative station in the family. 



I have seen but one species that accords with the above charac- 

 ters, which although a well known Fabrician species, and figured 

 ^ by Olivier, I think of sufficient interest from its peculiarity of 

 ' form, and also its scarcity, to have figured in this journal. 



2 K 2 



