DKOM^OLUS.— DIACEKUS. 223 



14. Dromseolus tetricus. 



Similar in form to D. fastidiosus ( d 1 ) ; antennae scarcely serrate, piceous, the two basal joints paler : head 

 densely punctate, vaguely longitudinally impressed, sparsely cinereo-pubescent, interocular carina distinctly 

 elevated, curving downward along the side of the clypeus, this very narrow at the base, not carinate ; thorax 

 broader at the base than long, sides convergent to the apex, slightly sinuate in front of the hind angles, 

 arcuate anteriorly, disc moderately convex, closely, moderately coarsely punctate, sparsely cinereo-pubescent ; 

 elytra flattened at the tip, vaguely striate at the base, sutural stria deepened at the apex, surface irregularly 

 submuricately punctate, closely at the base, quite sparsely at the apex, sparsely pubescent, cinereous at the 

 humeri ; body beneath moderately coarsely and closely punctate, sparsely cinereo-pubescent ; legs pale 

 rufo-testaceous, femora slightly darker. 



Length 2*5-3 millim. 



Hab. Guatemala, Las Mercedes, Capetillo {Champion) ; Panama, Volcan de Chiriqui 

 3000 feet {Champion). 



The smallest species at present known. The base of the propleural triangle is about 

 as long as the inner side. In the female the sides of the thorax are a little less 

 sinuate. The two or three basal joints of the antennae are paler, but a little variable. 

 The punctuation of the thorax also varies slightly in density. 



15. Dromseolus fastidiosus. 



Dromceolus fastidiosus, de Bonv. Mon. p. 226, t. 9. fig. 6 ( ? ), t. 10. fig. 1 (<?)\ 

 Tachycnemis Delauneyi, Fleut. & Salle, Ann. Soc. Ent. Fr. 1889, p. 406, t. 7. fig. 12*. 



Hab. Mexico, Teapa in Tabasco {H. H. Smith) ; Panama, Bugaba, Volcan de Chiriqui 

 {Champion). — South America, Cayenne * ; Antilles, Guadaloupe 2 . 



A small species which seems to be related to Thambus and Beltometopus. It has the 

 style of elytral sculpture of the former in both sexes, while the male thorax is very 

 like that of a Thambus. The antennal grooves being decidedly wider behind suggest 



Beltometopus. 



I have examined the type of Tachycnemis delauneyi ; it is inseparable from D. fasti- 

 diosus, de Bonv. 



DIACERUS, 



Diacerus, de Bonvouloir, Mon. des Eucnemides, p. 189 (1870). 



This o-enus at present contains but two species, and while closely related to Dromceolus, 

 it may be known by the second and third joints of the antennae being very small 

 and equal. 



1. Diacerus antennatus, 



Diacerus antennatus, de Bonv. Mon. p. 190, t. 8. fig. I\ 



Hab. Mexico, Toxpam, Cordova {Salle l ) ; British Honduras, E. Sarstoon {Blanca- 

 neaux)', Nicaragua, Chontales {Belt) ; Panama, Volcan de Chiriqui {Champion). 



In this species the antennae are a little longer than half the body, and rather strongly 

 serrate from the fourth joint. 



