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



in having the lower side of the prothorax still less hairy, and in having the posterior 

 intermediate areas of the metasternum more finely punctured. 



Paxillus robustus (Percheron). 

 Fig. VI, 10, p. 45. 



Passalus robustus, Percheron, 1835, pp. 35-36, pi. iii, fig. 1. 



Several specimens from different localities in Brazil (Santa-Catherina, Bahia, Rio de 

 Janeiro and Esperito-Santo). Length i5-2-i8'o mm. 



This species and the next are less stronglv flattened than any of the preceding members 

 of the genus ; they have the posterior plate of the prosternum strongly tapered behind 

 and have the clypeus entirely hidden ; the outer tubercles are variable in size, but are 

 probably always somewhat long and slender in unworn specimens, and the frontal ridges 

 are obsolete between them and the inner tubercles, though well developed between the 

 inner tubercles and central tubercle. The anterior angles of the head are sometimes 

 rather strongly produced and acute. The sides of the pronotum are more extensively, 

 and the grooves of the elytra more coarsely punctured than in P. leachii, which this species 

 resembles in other respects, except that the shoulders of the elytra are entirely hairless. 

 The tibiae of the intermediate (and to a less extent the hind) legs often bear several strong 

 spines on the outer side, especially in small specimens. 



Paxillus crenatus, MacLeay. 

 Fig. VI. 11, p. 15. 



Paxillus crenatus, MacLeay, 1819, p. 10 ; (Paris edition, p. 20). 



Several specimens from the Upper Amazon, Guadaloupe, Surinam and Mosquito. 

 Length iyo-ic^ mm. 



This species differs from the last only in having the frontal ridges broadly arcuate, 

 instead of meeting abruptly, in having the anterior extremities of the marginal grooves 

 of the pronotum broader and deeper, and in having the metasternum and elytra somewhat 

 less strongly punctured. 



The above mentioned species of Paxillus may be recognized from one another, as 



follows : — 



Ç Much flattened insects, with the clypeus more or less exposed . . . . 2. 



{ More robust insects, with the clypeus entirely hidden . . . . . . 5. 



r The outer tubercles short and blunt, not directed forwards 



\ above the clypeus .. .. ... .. .. .. 3. 



2 < The outer tubercles long and slender in unworn specimens, 



/ directed forwards above the angles of the clypeus which 



^ they tend to obscure . . . . . . . . . . . . 4 . 



The frontal ridges meeting in a strongly obtuse angle ; the 



posterior angles of the pronotum, and the shoulders of the 



elytra, densely covered beneath with long yellowish hair P. camerani, p. 48. 



The frontal ridges meeting in a right angle ; the posterior angles 



of the pronotum, and the shoulders of the elytra, less hairy 



beneath . . ... . . . . . . P. brasiliensis . p. 49. 



M 



