138 RHYNCHOPHORA. 
Closely resembling C. porcatus in structure, but smaller, more convex, and less elongate; quite black, with 
the antenne and tarsi alone lighter. Elytra relatively shorter, less obliquely rounded at apex, with 
shallower strize, the bases of the lateral striee more distinctly punctate, the pubescence paler and scantier. 
Sexual characters as in the preceding species. 
Hab. Panama, Volcan de Chiriqui, Bugaba (Champion). 
Nine specimens. This insect and the preceding afford one of those puzzling cases 
of which there are other examples in Central-American Scolytide, where two series of 
forms differ markedly in size, without intermediates, and yet present no prominent 
differences of structure. It is, of course, impossible without bionomical evidence to 
determine their value as species, but it seems desirable to indicate them by distinct 
names when they appear to be fixed varieties. In the series of these two Cnesini the 
dissimilarity in size is quite marked, and is accompanied by clear differences in the 
punctuation at the base of the lateral strie. 
4, Cnesinus lecontei, sp. n. 
Oblongus, subopacus, brunneus, capite nigro; prothorace transverso, dense strigoso-punctato, linea media 
indistincte elevata; elytris striatis, interstitiis planis, multipunctatis, ad basin granulatis, post medium 
breviter flavo-pilosis et seriatim setosis, in declivitate haud angustatis. 
Long. 3 millim. 
Mas. Rostro impresso. 
Oblong, not strongly shining, brown. Head black; rostrum (d ) with a cordate velvety pubescent impression, 
the front shining, pilose at sides only ; rostrum ( ) scarcely impressed and not densely pubescent, the 
shining frontal area smaller, pilose ; vertex closely punctured and dullin both sexes. Prothorax transverse, 
widest before base, subconstricted anteriorly, the sides rounded throughout ; surface convex, with very close, 
fine, strigose punctuation, the median line fine but elevated throughout. Scutellum rounded, rugose. 
Elytra twice as long as the prothorax and a little wider, separately rounded, narrowly elevated and 
suberenate at base, humeral angles obtuse, sides rounded throughout, more strongly towards apex ; 
strie narrow, incised, with indistinctly-expressed punctures, interstices rather wide, flat, finely rugulose, 
behind middle with fine, decumbent, yellow pubescence and a median row each of semi-erect sete. 
Underside and legs ferruginous-brown, the former with rather close subsquamous pubescence ; tibial 
spines moderate, the middle pair with a distinct apical process. 
Hab. Guatemata, Quiché Mountains (Champion); Panama, Volcan de Chiriqui 
(Champion). 
In appearance this species approaches Eupagiocerus dentipes, and through it 
Bothrosternus ; but it has no acute border to the prothorax, and the elytra] interstices 
are not subcostate towards their apex. Nine examples. 
5. Cnesinus paleatus, sp.n. (Tab. VI. fig. 10, antenna.) 
Oblongo-cylindricus, subnitidus, piceus, pilis crassis aspersus ; prothorace haud transverso, dense strigoso- 
punctato, linea media elevata levi; elytris prothorace latioribus, punctato-striatis, interstitiis planis, sub- 
rugosis, uniseriatim punctatis et setis erectis instructis. 
Long. 3 millim. 
Oblong, cylindrical, piceous, slightly shining, clothed with short coarse hair. Head black, the rostrum 
impressed, bituberculate at base, fringed at the sides and apex with short hairs. Prothorax as long as 
proad, its basal angles obliquely rounded, the sides straight and subdivergent to before the middle, thence 
obliquely rounded to the more obtuse apex ; surface moderately closely strigose, with a subcarinate median 
