32 Prof. J. O. Westwood's descriptions 



liind pair M'ith a small acute deaiticle about the middle. 

 Tarsi compressed, hind pair two-thirds as long; as the 

 tibi:i3. Beneath feebly punctured, ])ubescent with brown 

 hair; mentum deeply concave, subtriangular, bisinuate 

 behind, with the side angles produced and rounded; hind 

 margin feebly notched at the middle. 



Length, 10"6 mm. = 0*42 inch. 



Northern New Mexico; Lieut. W. L. Carpenter. 



In the division of the disk of the prothorax into three 

 parts, this species seems to be related to C, saucius. The 

 dividing groove is, however, not well defined, and in other 

 respects there is no resemblance. The form of the mentum 

 is quite peculiar, and in a group where specific differences 

 are of less magnitude, would warrant the establishment of 

 a separate genus. 



Subfamily Dynastides. 

 Genus Amblyodus, n. g. 



Genus novum Phileuro proximum, Leptognatho et 

 Actinobolo affine ; differt capite cornuto raandibulisque 

 extus obtuse dentatis. 



Corpus sub-breve, subparallelum subcylindricum (Sieno- 

 dendron parum simulans). 



Caput mediocre lateribus in cornua duo curvata, apice 

 obtusa elevato-porrectis (pi. II. figs, lo, 1^). 



Mandibulte porrectfe, lateribus externe dilatatis et ob- 

 tuse dentatis, dextera 2, seministra 3 dentibus obtusis 

 armatis; spatio parvo setoso marginis interni, laminaque 

 motari basali instructs (fig. \c). 



Maxillie elongatas extus longe setigerre, lobo apicali ad 

 basin in spinam curvatam apice denticulatam producto; 

 parte apicali curvata, apice obtusa, intus inermi vel dente 

 obtuso armata; pal]iis maxillaribus mediocribus articido 

 ultimo elongato ovali (fig. \d). 



Mentum corneum crateriforme, medio canaliculatum, 

 basi carinatum punctatum setosum, apice emarginato 

 (fig. \e). 



Labium intermun : palpi labiales intus mentum inserts 

 articulo apicali tantum detecto ^^fig. \e\ 



Pronotum magnum semiovale, latitudine elytris a?quale, 

 antice retusum scabrum, margine postico fere recto, utrin- 

 que lobo elevato obliquo glabro instructum. 



Scutellum triangulare apice rotundato elytra brevia 

 apice rotundata, convexa. 



