COLEOPtERA. 421 



resemble mandibles, and are either truncated, or obtuse and entire at 

 the end, or terminated by two or three teeth. 



Those, in which the mentum is almost ovoid and very hairy, and 

 Avhose maxillae terminate in a similarly pilose, triangular lobe, with- 

 out teeth, or with but very small ones situated near the middle of 

 its inner margin, form two subgenera(l). 



Pachypus, Dej. — Geotrupes, Melolontha, Fab. 



The antennae of the males are composed of but eight joints, of 

 which the five last form the club. The mandibles are in the form of 

 very thin, triangular, elongated leaflets, and are entirely concealed, as 

 is also the labrum. The terminal lobe of the maxillae is very small, 

 scarcely distinct, and without teelh. The mentum is extremely 

 prominent, projects forwards, and is rounded on the summit. The 

 terminal joint of the palpi is the longest of all, and nearly cylind rical. 



The body is thick, the epistoma semicircular, concave above, and 

 distinguished posteriorly from the vertex by a transverse carina. 

 The thorax of the males is excavated and armed anteriorly with a 

 horn; the four posterior tibiae are strong, deeply incised transversely, 

 with their extrernity widened and crowned with a range of little 

 spines; the spurs are large. The tarsi are long, slender, pilose, and 

 terminated by two small equal and simple hooks. 



With the exception of the antennae and the form of the epistoma, 

 this subgenus approximates much nearer to Oryctes than to Melo- 

 lontha(2), 



Amblyteres, Mac Leay. 



The antennae consist often joints, the three last forming the club. 

 The labrum is exposed and lobate. The mandibles are strong and 

 scaly. The maxillary lobe is of a moderate size, and its inner side 

 armed with corneous teeth. The middle of the superior extremity 

 of the mentum is slightly prolonged and truncated, the angles round- 

 ed and bearing the palpi; their last joint is ovoid, the same of the 

 maxillae is much elongated and very cylindrical. The scutellum is 

 large(3). 



(1) The sternum presents no projection whatever. 



(2) Geotrupes excavaius, Fab., the male; Melolontha cornuta, Oliv. , Col., I, 5, vii, 

 74, a, b, the male; Scarab, candidss, Petag., Insect. Calab., I, 6, a, b, the male; a 

 black variety also, observed in Corsica by M. Peyrandeau, and subsequently in 

 Sicily by M. Lefevre; — M. atripUus, Fab., a female of another species. 



(3) Mac Leay, Hor. Entom., I, p. 142. This gentleman says nothing about the 

 crotchets of the tarsi, nor sexual differences. From the description of the species 



