LUDIUS. 501 



intercoxal portion of the mesosternum subangularly raised anteriorly ; outer 



prosternal suture faint or interrupted, the space enclosed sparsely punctate ; 



third joint of the antennae short, very little longer than the second; elytra 



finely striate. Species large and robust. 



e'. Antennae broadly, and acutely serrate in male setosus. 



f. Antennae moderately dilated and serrate in male meridanus. 



1. LudillS Cylindricollis. (Tab. XXII. figg. 6, $ ; 6 «, prosternal process.) 



§ . Moderately elongate, broad, robust, shining ; nigro-piceous, the legs and antenna? ferruginous ; above and 

 beneath somewhat thickly clothed with short, decumbent, fulvous pubescence. Head thickly, coarsely 

 punctate ; antennae short, not nearly reaching the hind angles of the prothorax, the joints from the fourth 

 moderately dilated and serrate, 3 considerably longer than 2, the two together longer than 4, 11 appendi- 

 culate. Prothorax convex, about as long as broad, with the sides subparallel in their median third, and 

 rounded in front, slightly widening behind, the marginal carina visible from above towards the base only ; 

 the hind angles long, straight, and very sharply, obliquely carinate, the carina extending for some distance 

 forwards; the surface coarsely and somewhat thickly punctate, the punctuation sparse on the basal 

 declivity. Elytra two and two-thirds longer than the prothorax, rapidly narrowing from about the 

 middle, becoming very narrow at the apex, the apices rather sharp ; thickly, finely, rugulosely punctate, 

 with the sutural stria only distinct, the others almost obsolete. Beneath finely and somewhat thickly, 

 the prosternum and propleurae coarsely and more sparsely, punctate ; prosternal process long, extended in 

 the plane of the prosternum for two-thirds of its length, the ante-apical tooth very prominent ; intercoxal 

 portion of the mesosternum declivous, V-shaped ; posterior coxal plates broadly widened in their inner 

 third, triangularly dilated opposite the point of insertion of the femora. 



Length 21 1, breadth 6 millim. . 



Hab. Nicaragua, Chontales (Belt). 



One example. This insect resembles L. setosus, but may be known from it by the 

 longer thorax, the more coarsely punctured propleurse, the very differently formed 

 pro- and mesosternum, and the triangularly dilated posterior coxal plates. From 

 the North-American L. hepaticus, Lee, it differs in the more cylindrical thorax, the 

 long, horizontal prosternal process, the triangularly dilated coxal plates, the obliteration 

 of the elytral striee (the first excepted), &c. 



2. LudillS nigricollis. (Tab. XXII. figg. 7, <S ; la, antenna.) 



Elongate, narrow, rather convex, shining; castaneous-brown, the elytra with the basal declivity usually 

 rufous, and in some specimens the sides from a little below the shoulder to about the middle indetermi- 

 nately piceous, the prothorax black, with the basal and apical margins and the hind angles usually 

 castaneous ; beneath black, the apex of the abdomen and the hind coxae reddish-brown, the antennae and 

 legs ferruginous : above and beneath sparsely clothed with rather long, decumbent, fulvous hairs. Head 

 thickly, somewhat coarsely punctate ; antennae nearly half the length of the body in the male, much 

 shorter in the female, rather slender, joints 2 and 3 very short, equal, 4-11 moderately serrate, 4 in 

 both sexes very much longer than 2 and 3 united, 11 appendiculate. Prothorax convex, nearly as 

 long as broad, gradually narrowing from the base forwards, the sides rounded anteriorly, the posterior 

 portion only of the marginal carina visible from above; the hind angles long, slightly divergent, a little 

 incurved at the tip, sharply, obliquely carinate ; the surface sparsely and moderately coarsely punctate, 

 deeply canaliculate behind. Elytra three times the length of the prothorax, slightly rounded at the sides, 

 rapidly narrowing from a little below the base, the apices narrow and conjointly rounded ; somewhat 

 sparsely, rugosely punctate, subgranulate towards the base, the sutural stria only well defined, the others 

 indistinct or obsolete. Beneath thickly, the propleurae sparsely, punctate, the punctures on the prosternum 



