216 RHYNCHOPHORA. 
base, with the shoulders rounded, the sides subparallel to the middle, then gradually and obliquely 
rounded to the apex; surface cylindric, strongly and convexly declivous for the posterior third, sub- 
glabrous except on the declivity, with non-impressed rows of regularly-placed punctures ; interstices flat, 
with a few sete arising at rare intervals, the first and third with two or three small tubercles on the 
convex shining declivity, the second not impressed. Underside, antenns, and legs pale testaceous. 
Hab. Panama, Volcan de Chiriqui (Champion). 
A single example has reached us of this slender little species. It is distinguishable 
from its allies by its small size, the very fine seriate punctures of the elytra, the 
subimpunctate interstices, and the obliquely narrowed apex, a feature which is very 
evident upon comparison with such a species as X. affins. The declivous area begins 
farther back than in that species, and is quite regularly convex, without any striate 
impressions or strong punctures. 
32. Xyleborus affinis. 
3 @. Xyleborus affinis, Kichh. Berl. ent. Zeitschr. 1867, p. 401'; Rat. Tom. p. 372°. 
Xyleborus perforans, Blandf. Kew Bull. nos. 67-68, p. 157 (1892) °. 
? Xyleborus pubescens (in parte), Zimm. Trans. Am. Ent. Soc. 1868, p. 145*; Eichh. Proc. U. 8. 
Nat. Mus. xviii. p. 609 (1896) *. 
Had. VUnitep States} 25,—Mexico, Acapulco in Guerrero, Jalapa (Hoge), Toxpam, 
Cordova, Vera Cruz (Sallé); GuatEmaLa, Panima, Cubilguitz and San Juan in Vera 
Paz, Cerro Zunil, Las Mercedes, Zapote (Champion); Nicaragua, Chontales (Janson) ; 
Panama, Tolé, Volcan de Chiriqui (Champion).—CoLoMBIA?; BRAZIL 2; Peru; ANTILLES, 
Cuba 12, Porto Rico, Barbados, St. Vincent 3, Nevis, Grenada, Tobago 3, Trinidad *.— 
MAURITIUS 2. 
We have numerous examples of this common and widely-distributed neotropical 
form, which attracted much attention a few years ago owing to its attacks on sugar- 
cane in various Antillean islands?. The Central-American specimens all belong to the 
typical form, separable from X. torguatus by the much finer elytral punctures and the 
very oblique declivity, which is dull and much more finely tuberculate. 
In my report? on “ Sugar-cane Borers in the West Indies,” I treated this species 
as identical with X. perforans (Woll.), but in a later pamphlet, “Report on the 
Destruction of Beer-casks in India by the attacks of a Boring Beetle,” London, 1893, 
pp. 46-47, I discussed the differences in greater detail, after the study of more material, 
and pointed out that the localities of the true X. afjinis were neotropical, with the 
exception of Mauritius, and with the exception of Jamaica and the Amazons those of 
X. perforans were entirely paleotropical, but that examples were before me from Nevis, 
Trinidad, Porto Rico, and Ceylon which could not be positively referred to one or the 
other species; I also pointed out that the one male of X. perforans I had seen differed, 
though perhaps not materially, from the large number of male X. affinis I possessed. 
The specimens I have now examined from various localities amount to several hundreds, 
