TKIPLONYCHTTS. 427 



thorax very convex, as long as broad, rounded at the sides from the middle forwards, gradually and 

 obliquely narrowing behind ; the hind angles rather obtuse ; the surface thickly, finely punctate, the 

 disc smoother in the middle behind, deeply canaliculate before the base ; the base incised on either side 

 near the hind angles. Elytra less than twice the length of, and narrower than, the prothorax, narrowing 

 from the base ; with irregular double series of fine punctures, the interstices smooth and strongly costate 

 to a little beyond the middle, the third, fifth, seventh, and ninth very sharply and acutely carinate thence 

 to the apex. Beneath closely, finely punctate. Claws tricuspid. 

 Length 4|, breadth 1| millim. 



Hab. Panama, San Feliz in Chiriqui (Champion). 



One specimen, probably a female. Allied to T. costatus and T. lebasi, Cand., from 

 Tropical South America. The thorax is much more convex than in T. lebasi, and the 

 elytral carinas are very sharply raised. 



2. Triplonychns trivittatus. (Tab. XIX. fig. 10, <s .) 



Moderately elongate, narrow, slender, shining, somewhat sparsely clothed with fine yellowish-cinereous pubes- 

 cence ; testaceous, the head with a subtriangular or transverse patch on the vertex, in some specimens 

 extending over the greater part of the front, black or piceous ; the prothorax with a broad median vitta and 

 a stripe on either side extending from the base to near the apex, the marginal stripe widening anteriorly 

 and in some specimens connected with the median vitta before and behind the middle, black or piceous ; 

 the scutellum fusco-testaceous or piceous ; the elytra with the suture narrowly and the sides to a greater 

 or less extent fuscous or piceous, the marginal stripe sometimes extending inwards at the middle and at 

 the apex so as to partly enclose two oblong patches of the ground-colour on each elytron ; beneath 

 piceous, sometimes in great part testaceous ; the antennas piceous or brown, with the two basal joints 

 testaceous, in some specimens entirely testaceous ; the legs flavo-testaceous. Head closely, finely punctate, 

 obsoletely sulcate in the middle behind ; antennse slender, rather more than half the length of the body. 

 Prothorax broader than long, moderately convex, very little wider at the base than at the apex, rounded 

 at the sides, the latter sinuate behind ; the hind angles rather short ; the surface closely, finely, uniformly 

 punctate ; the base sinuate and bi-incised on either side. Elytra about two and two-thirds longer than 

 the prothorax, and a little wider than it at the base, feebly rounded at the sides, narrowing from the 

 basal third to the apex, the humeri rounded ; sulcate, the sulci with irregular double series of fine punc- 

 tures, separated by convex, sparsely punctured interspaces, the alternate ones becoming costate before 

 the apex. Beneath closely, very finely punctate. Fourth tarsal joint dilated and excavate above for the 

 reception of the fifth joint. Claws bicuspid. 



Length 4|-6, breadth l|-if millim. (J.) 



Hob. Nicaeagua, Chontales (Belt) ; Panama, Bugaba, San Feliz, Tole (Champion). 



Found in numbers by myself in Chiriqui ; a single specimen only has been received 

 from Chontales. They appear to be all males. In this and the following species the 

 claws are bicuspid, as in Horistonotus exoletus and its allies ; the fourth tarsal joint is 

 more or less dilated and sublamellate, as in Esthesopus ; and the elytra are sculptured 

 as in Triplonychus, that is to say they have irregular double series of punctures, 

 separated by raised interspaces. The present species resembles T. plagiatus, Er., from 

 Para, but it is a great deal smaller than that insect and much more finely punctured. 



A male from Bugaba is figured. 



3. Triplonychus parvulus. (Tab. XIX. fig. 13, e .) 



Moderately elongate, narrow, slender, shining, finelv pubescent; the head and prothorax black or piceous, the 



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