OMAMMATUS. 469 



on the genus calls the thorax angulate, but in the descriptions of the species he 

 does not mention this shape, and as the two described species seem to differ greatly 

 amongst themselves in regard to structural details, the generic value of Omammatus 

 can only be settled when more material is obtained. 



Two species from the State of Panama I have provisionally placed in this genus. 

 Omammatus is confined to Tropical America, the genus ranging from the Colombian 

 State of Panama to Brazil. 



1. Omammatus sericeus. 



Dark fulvous, clothed with flavous pubescence ; antennas filiform, the seventh and eighth joints fuscous ; thorax 

 narrowed in front, nearly impunctate ; elytra clothed with short and close flavous pubescence, an obscure 

 spot below the middle of each, fulvous. 



Length 2 lines. 



Head rather closely punctured immediately above the eyes, the vertex with a smooth central longitudinal line ; 

 the frontal tubercles elongate and very distinct, joined to the acutely raised carina which extends to the 

 clypeus ; antennas nearly half the length of the body, the third and the two following joints more elongate 

 than the rest and of equal length, the' five terminal joints shorter and stouter; thorax a little longer than 

 broad, slightly cylindrical, distinctly narrowed in front, the lateral margins straight, the sides deflexed 

 near the anterior angles, a distinct longitudinal depression is placed at the middle of the disc near the 

 anterior margin, tbe surface extremely finely punctured and very sparingly pubescent; scutellum small, 

 fuscous ; elytra rather broadly ovate, strongly narrowed posteriorly, without any basal depression, rather 

 strongly punctate-striate, the punctuation entirely indistinct at the apices on account of the velvet-like 

 flavous pubescence at that part, the rest of the surface less thickly pubescent ; posterior tibiae with a 

 single spur ; claws appendiculate ; legs of the same colour as the body, and clothed with flavous pubes- 

 cence. 



Hah. Panama, Volcan de Chiriqui {Champion). 



The single specimen obtained seems to me to find its place in Omammatus, on 

 account of the shape of the thorax, the single spur at the apices of the posterior tibiae, 

 and the subfiliform palpi. 0. sericeus differs from 0. turgidus, Clark, in the fulvous 

 colour of the upper surface and the different coloration of the antennae. 



2. Omammatus nitidus. 



Homammatus nitidus, Clark, Cat. Halticidse, p. 119, t. 4. fig. 8 S 

 Rah. Panama, Bugaba {Champion). — Colombia 1 . 



I have only to add to the description of Clark, which agrees in every respect with 

 the two specimens obtained at Bugaba, that the punctuation of the elytra is scarcely or 

 not at all visible below the deep basilar depression ; that of the thorax extends obliquely 

 upwards and across the disc, but not to a very marked degree. The species, although 

 said by Clark to be contained in the Baly collection, is, like several others, not to be 

 found there, consequently I am not enabled to compare our insect with the type. 



