14G A. MATTHFAVS. 



Metasternum narrow, sub-quadrate, widely distant from the sides of 



the body, episterna and epimera very broad. 

 Venter (i segments. 



Le(^iS anterior and intermediate long, posterior very broad. 

 PosTEKloR cox.E remote, very broadly laminated. 



M. triraniosuin Motschulsky Bull. Moso. 41 , p. 1 89, 1 sns.— L. c. .50— .o;; mm. 

 — Elongate, oval, convex, very shining and smooth, rufo-piceous; head moderate; 

 eyes large and prominent : thorax moderate, not longer and scarcely wider than 

 the head, widest behind the middle, very much constricted towards the base, with 

 five very deep sulci, of which the middle reaches from the base nearly to the an- 

 terior margin, the intermediate parallel and rather shorter, the exterior very short 

 and divergent, the posterior angles acute and prominent ; elytra long and narrow, 

 longer but scarcely wider than the head and thorax, widest before the middle, re- 

 motely and very indistinctly punctate-striate, apex broad, rounded and paler; legs 

 and antennfp pale yellow. 



Differs from M. trisulcatum in its smaller size, rufo-piceous color, and 

 parallel sulci of the thorax. 



Central America (Motschulsky). 



ACTIDIUM. 



Matthews Ent. M. Mag. 5, p. 12, 1868. 

 Antenna 11 -jointed, 9th scarcely, 10th and 11th very much incrassated. 

 Head porrected. 



Pronotum small, base lying upon the shoulders of the elytra. 

 Elytra entire, long. 

 Mesosternum small, widely carinated. 



Metasternum long, quadrate, reaching to the sides of the body. 

 Venter with 7 segments. 



Legs robust, generally short and much dilated, tarsi very short. 

 Posterior cox^ slightly dis'tant, very*slightly laminated. 



Synoptic Table of Species. 



Body smooth and very shining. 

 Thorax closely tuberculate, or alutaceous. 



Elytra intlaCSd Crotcliianniii. 



Thorax smooth, elytra moderately convex politliill. 



Body pubescent and linear FowIeriailUlil. 



A. Fowlerianum Matthews n. sp.— L. c. .38 — .60 mm. — Elongate, linear, 

 very narrow, convex, obscure, castaneous, densely clothed with silvery pubescence ; 

 head large, obtuse, closely tuberculate; eyes small, rather prominent; thorax 

 small, transverse, neither longer or wider than the head, very closely tuberculate ; 

 sides rounded and abruptly contracted at the base, basal margin rounded; elytra 

 long, twice as long, but scarcely wider than the head and thorax, widest before the 

 middle, and attenuated towards the apex, closely asperate, apex rounded : legs 

 bright vellow ; antennae robust, dusky yellow. 



