30 Memoirs of the Indian Museum. [Vol. VII, 



Genus PSEUDACANTHUS, Kaup, 1869, p. 9. 



Incl. Nasoproculus, Zang, 1905c.;? Ogyges, Kaup, 187 1 ; ? Petrejoides, Kuwert, 1896; 



Triaenurgus, Bates, 1886 ; ? Truquius, Bates, 1886. 



Type, Passalus mexicanus Traqui, 1857, pp. 315-316. 



Pseudacanthus bifidus (Zang). 



Fig. IV, 13, p. 24. 

 Nasoproculus bifidus, Zang, 1905c, p. 232.' 



Six specimens from Mexico. Length 37-41 mm. 



The antennal lamellae are long, being equal to three or four of the immediately preced- 

 ing joints. The anterior margin of the labrum is deeply cleft ; the sides of the labrum are 

 straight and parallel. The clypeus is strongly arched on either side of a still stronger 

 median concavity. The central tubercle resembles that of the genus Oileus in general form. 

 There are no frontal tubercles or ridges. The parietal ridges are obsolete. The pronotum 

 is unpunctured ; its median groove is very strong, but does not quite reach the anterior 

 margin. The scutellum is strongly punctured on either side of the middle line. The 

 mesothoracic episterna are punctured above and near the anterior margin only ; they are 

 glossy, except for a matt oval patch behind the lower margin and a matt streak in the 

 posterior angle. The mesosternum is glossy except in the scars, which are matt ; it 

 is unpunctured. The metasternum is hairless, and is unpunctured except in the 

 posterior intermediate areas ; the lateral areas are linear and smooth. The abdominal 

 sterna are smooth. The grooves on the elytra are finely punctured laterally. 



Pseudacanthus solidus (Arrow). 



Fig. IV, 12, p. 24. 

 Triaenurgus solidus, Arrow, 1907, pp. 452-453. 



Described from a (damaged) cotype, 39 mm. long, from Chuipache, Quezaltenango, 

 Guatemala, lent by the British Museum. 



The anterior margin of the labrum is lightly concave. The clypeus is straight, and bears 

 a pair of small tubercles, each situated about half way from the middle line to the tubercle 

 in which it terminates laterally. The parietal ridges, though somewhat small, are quite 

 distinct. There are two or three punctures in or near the scars on each side of the 

 pronotum. The matt areas of the mesothoracic episterna are even more restricted than in 

 P. bifidus. The mesosternum is punctured and hairy laterally behind. The lateral areas of 

 the metasternum are broad ; both these areas, and the intermediate areas in front of and 

 behind the usual group of coarse hairless punctures on the posterior intermediate areas, 

 are covered with hair-bearing punctures. The abdominal sterna are smooth. In other 

 respects this vspecies resembles P. bifidus. 



Pseudacanthus jalapensis, Bates. 



Fig. IV, 14, p. 24. 

 Pseudacanthus jalapensis, Bates, 1886, p. 9, pi. i, figs. 10-lOa. 

 One specimen from Oajaca, S. Mexico. Also a cotype from Jalapa lent by the British - 

 Museum. Length 22-0-23-5 mm - 



