Mr. H. W. Bates on the Longicorns of the Amazons Valley. 167 



The first pair, as in the male, is terminated by a powerful claw; 

 the last joint of the others is hollow, and terminated by a round 

 orifice. 



The abdomen has on each side a broad, lamellar, bifurcate 

 false leg, and these appendages are preceded by others which 

 are also lamellar, pointed and denticulated on the margins ; these 

 are organs of propulsion, and subsequently form the branchiae. 

 In some individuals the extremity of the abdomen bears, close to 

 the anus, two small, flat, rounded, margined laminae. The body 

 of the young animal is of a pale violet-grey colour, as are also 

 the eggs; and it is to the latter, seen through the transparent 

 incubatory laminae, that the suprathoracic pouch of the female 

 owes its peculiar tint. 



The females of these Crustaceans reside in tumours produced 

 by them on the inner surface of the arch of the branchial cavity 

 in Galatea squamosa; and the males are found adhering to the 

 abdomen of the females, frequently to the branchial laminae. 

 In many cases two males are attached to one female. 



XXII. — Contributions to an Insect Fauna of the Amazons Valley. 

 Coleoptera : Longicornes. By H. W. Bates, Esq. 



[Continued from p. 113.] 



6. Hypselomus pay anus, Pascoe. 



H. sordide fuscus, nigro obscure irroratus ; thorace dorso tuberoso, 

 lateribus tuberculo acuto ; elytris humeris subconicis, antice cur- 

 vato angulatis, cristis centrobasalibus prominulis, obtusis. Long. 

 7-8 lin. S $ ■ 



Head dingy brown. Antennae blackish brown, bases of the 

 joints (from the fourth) pallid. Thorax with prominent dorsal 

 ridge and, on each side, two well-marked tubercles, sides each 

 with a small acute tubercle ; colour dingy tawny brown, speckled 

 with dusky. Elytra with projecting shoulders, the projection 

 somewhat conical, but anterior slope curved or angulated, the 

 apex formed by a thick black tubercle ; centro-basal ridges pro- 

 nounced, but not crested with tubercles ; surface dingy tawny 

 brown, speckled or irregularly marked with, dusky. Body be- 

 neath dingy brown ; abdomen black in the middle. Legs 

 blackish, speckled with tawny ; base of claw-joint reddish : 

 posterior tibiae in the male dilated at apex. Supplementary 

 antennal joint of male wanting. 



Ega and S. Paulo, Upper Amazons. 



7. Hypselomus seniculus, n. sp. 



H. parvus, fuscus griseo vestitus, summa fronte acute bituberculata ; 



