122 RHYNCHOPHORA. 
_ Hab. Mexico, Toxpam}, Playa Vicente (Sallé), Vera Cruz (Hége); GuaTEMALA, 
Capetillo, San Gerdénimo, Chacoj in Vera Paz, Mirandilla (Champion).—Cvusa *. 
A common species, taken in some numbers by M. Sallé at Toxpam, and by Mr. 
Champion at San Gerénimo. It varies in shape, the prothorax and elytra being rela- 
tively narrower in small specimens; the elytra are sometimes entirely piceous. The 
head (2 ) may be impressed below the frontal tubercle, and the lateral fringe of hairs 
may vary in length, extent, and colour. The rows of punctures on the elytral inter- 
stices may be shallower or deeper, more or less striate. The apophysis varies in length 
and in the degree of lateral compression, which is greater in the larger examples ; in 
one female it is so short as to resemble a vertical carina. The variation in size is 
more considerable than in any other Scolytid; but in this respect the genus Scolytus 
is unusually variable, and a long series of S. mudltistriatus will show almost as striking 
divergences. 
8. Scolytus marginatus. 
Scolytus marginatus, Chap. Syn. Scol. p. 56 (Mém. Soc. Liége, 1873, p. 264) ‘ 
Moderately shining, black or piceous, with the extreme borders of the prothorax reddish ; elytra brown, with 
the suture and margins black. Front (? 2 ) convex, with a transverse tubercle over the mouth connected 
by a smooth line with the shining emarginate oral border, punctured and weakly aciculate above. Pro- 
thorax not longer than broad, sometimes distinctly transverse, not perceptibly sinuate at base, the sides 
rather regularly and strongly rounded ; its punctuation very close and strong at the sides and apex, finer 
and sparser towards the middle, with an indistinct smooth median line. Scutellum large, triangular, 
brown. Elytra a little longer than the prothorax, deeply impressed round the scutellum, with the apical 
elevation and submarginal impression not strong, punctate-striate, the striae narrow and rather feebly 
impressed before the apex, the interstices narrow, with single rows of punctures, usually a little finer 
than those of the strie, the rows sometimes impressed and thus substriate, the alternate interstices, the 
side and hind margins set (in fresh specimens) with short light bristles. Abdomen black, subconcave, 
2nd segment with a short blunt apophysis. Legs entirely piceous-red. 
Length 2°4-3 millim. 
Hab. Mexico, Yucatan}; Guatemata, Torola (Champion). 
Four examples were taken at Torola; on comparing them with the type, I can see 
no sexual differences. The front, thinly pubescent in two of the former examples, is 
nearly glabrous in the other two. The dark margins to the elytra are distinctive. The 
type is somewhat immature, and has the entire prothorax brown in consequence. 
4. Scolytus costellatus. (Tab. V. fig. 9.) 
Scolytus costellaius, Chap. Syn. Scol. p. 58 (Mém. Soc. Liége, 1873, p. 266) *. 
Deep black, the antenn and tarsi reddish. Front nearly flat, closely aciculate from the mouth to the vertex, 
with a few curled hairs at the sides; antennal club acuminate. Prothorax transverse, with the base 
rather strongly bisinuate, shining, finely and sparsely punctured in the middle, with a narrow median 
smooth line, very coarsely punctured at the sides, the interspaces strigose towards the apex. Scutellum 
absent. Elytra as long as the prothorax, the postero-lateral angles broadly, the hind margin obtusely 
rounded; surface slightly impressed at the base of the suture, little elevated towards apex, with the 
submarginal impression inconspicuous, dull, entirely covered with numerous narrow deep crenate striz, 
