Longicorn Coleoptera of Tropical America. 43 



ninth; in 0. leucothea joints sixth, seventh, and the apical half 

 of the fifth. In the anterior legs the femora are chestnut-red, and 

 the tibiae, and tarsi testaceous yellow (in 0. albicans these 

 colours are exactly reversed) ; the middle tibias and base of the 

 femora are testaceous yellow. Notwithstanding this close 

 general similarity, it is likely the two insects belong to diffe- 

 rent genera, the antennae (according to Klug's figure) appear- 

 ing to be simple, like the typical Ommake^ and the elytra 

 parallel. In 0. leucothea the antennge are serrate from the 

 fifth joint, and the sutural margin of the elytra is strongly in- 

 curved from before the middle. The disk of the elytra is 

 vitreous. The abdomen is red, and in the female vespiform. 

 I have seen four examples, all females, and exactly similar. 



21. Odontoceral albicans, Klug. 



Stenopterus albicans, Klug, Eutom. Bras. Specim. alter, p. 53, t. xliv. 

 f. 5. 



Rio Janeiro. 



aa. Hind femora gradually thickened. 



22. Odontocera hilaris, n. sp. 



0. nigra, thorace supra aurantiaeo-rufo, elytrorum disco femoribus- 

 que posticis basi flavo-testaceis. Long. 4| liu. 5 • 

 Odontocera punctata, Bates, Trans. Ent, See. 1870, p. 323 (nee Klug). 



R. Tapajos, Amazons [coll. H. W. Bates). 



Short and rather robust. Head with broad and not very 

 elongate muzzle ; the eyes in the unique specimen approach 

 tolerably near to tlie median line in front, and seem to show it 

 to be a male ; but the short and broad sessile abdomen is that 

 of a female. The antennaj are short, thickened and serrated 

 from the fifth joint. The thorax is strongly rounded on the 

 sides and constricted at the base, the surface closely reticidate- 

 punctate. The elytra reach nearly to the middle of the third 

 segment, with the suture dehiscent only from the middle, rapidly 

 narrowed but truncated at the apex ; the margins are narrowly 

 deep black, leaving the whole disk pallid and vitreous, with- 

 out visible punctures, except at the base. The hind legs are 

 greatly elongated, the femora very gradually clavate, the tarsi 

 short and slender. 



I had erroneously referred this species to (^A^)?/?<c^rtto(Klug), 

 with which it agrees in colour and general form ; but O. punc- 

 tata (of which I have now an example before me) has longer 

 elytra, with their vitreous disks covered with strong dark 

 punctures. The eyes in the female approach the median 



