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METAMASIUS. — HOMALOSTYLUS. 



117 







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Two females. Very like M. submacidatus, and similarly coloured, but with the 



pro thorax not so coarsely and more unequally punctured, the elytral interstices almost 



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impunctate, the rostrum ( $ ) strongly arcuate, the upper surface opaque. The widely 

 separated intermediate coxse distinguish M. octonotatus from Rhodobcenus. 



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HOMALOSTYLUS. 



Homalo stylus. Chevrolat, Ann. Soc. Ent. Fr. 1885, p. 287. 



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type of this genus is Sphenophorus latiscapus, Kirsch, from Colombia. Four 

 species are now added from within our limits, one of them, R. dentirostris, having the 





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formed as in Homalostylas in the male, and as in Rhodobcenus in the female. 

 Nevertheless, it is convenient to retain Chevrolat's genus as distinct for the present. 



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characters are: — Antennal scape more or less dilated throughout the 



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greater part of its length, at least in the male ; peduncle of the submentum narrow, 





flattened or compressed ; anterior coxae subcontiguous ; metasternum somewhat tumid 



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and extending conically forwards between the narrowly separated middle coxse; third 



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tarsal joint broad, spongy-pubescent beneath. 



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1. Homalostylus nigrofasciatus, sp. n. (Tab. V. figg. 29, 29 a, <? ; 30, $ .) 



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Elongate, subfusiform, opaque above; black, pruinose, the fine scattered punctures each surrounded by a 



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arger conspicuous cinereous spot, the spots arranged in a single series along each elytral interstice, the 

 elytra also with two more or less distinct, transverse, velvety-black fasciae — one about the middle and 



the other towards the apex. Rostrum stout, about as long as the prothorax, strongly and abruptly 

 arcuate from the rather short, broadly widened, rugose basal portion ; the apical portion compressed, 

 closely punctate and carinate at the base above, becoming gradually smoother towards the tip, and 

 shallowly silicate, laterally crenate, and angulate near the apex beneath, in the $ smooth and angulate 

 nearer the tip ; the frontal fovea small. Antennal scape broadly dilated, rounded within, sinuate 

 without, distinctly wider than the club in the S , a little narrower in the $ . Prothbrax slightly 

 longer than broad, obliquely narrowing from about the middle, feebly bisinuate at the base, transversely- 

 excavate on the disc posteriorly, very sparsely, finely punctate. Scutellum long, narrow. Elytra 

 a little wider than the prothorax, oblong, very finely punetate-striate, the interstices flat, each with a 

 scattered series of minute punctures. Pygidium long, subconical, rather convex, sparsely punctate, 

 setulose at the tip. Beneath very sparsely, finely punctate ; ventral excavation of the $ extending 

 forwards on to the metasternum, the first segment with a short cariniform prominence in the middle 

 towards the base in this sex. Eemora with scattered short hairs beneath. Tibiae closely fringed with 

 short hairs, the posterior pair broadly dilated, rounded externally and feebly sinuate within. 

 Length 10-12|, breadth 2&-4 millim. (<J $ .) • f 



Hal. Costa Rica, Rio Sucio (Rogers : <r ), Guaitil de Pirris, Pacific slope, 800 metres 





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iolley: 6 ) ; Panama, Volcan de Chiriqui (Champion: $ ).. 



description is taken from three males and one female. More elongate than 

 Colombian H. latiscapus (Kirsch) (the type, ? , of which I have seen), and very 



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differently coloured ; the posterior tibiae broadly dilated ; the antennal scape wider ; 



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e rostrum of the male strongly crenate and angulate near the tip beneath, the first 







ventral segment with a short cariniform prominence in this sex, as in Rhodobcenus 





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maculifer. 







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