88 | PHYTOPHAGA. 
sides in the male straight and diverging from the base to some distance beyond the 
middle, thence abruptly converging to the apex; nearly parallel posteriorly, then 
converging and sinuate from immediately above the middle towards the apex in the 
female, the anterior angle in both sexes armed with a stout subacute tooth ; upper surface 
rugose-punctate, an irregular vitta on the sides, together with four longer depressions 
on the disc, black, the two anterior depressions transverse, often confluent, and in some 
specimens concolorous with the general surface of the thorax. Scutellum subquadrate. 
Elytra narrowly oblong, slightly increasing in width towards the posterior angle, the 
latter distinct in both sexes, abruptly dilated laterally in the male; the lateral margin 
armed with a number of short acute teeth, the apical margin obtusely rounded, more 
coarsely serrate ; upper surface finely seriate-punctate ; each elytron with a number of 
strongly raised ridges, which anastomose, and form an irregular network over the 
surface; on the middle disc and again at the apex near the suture, they are more 
strongly elevated than on the other portions of the surface. 
2. Octotoma championi. 
Oblongo-elongata, dorso subdeplanata, nigra, nitida ; pedibus nigro-piceis, femorum basi genubusque pallide rufo- 
piceis; capite thoraceque piceo-rufis, illo vertice antennarumque clavo nigris; thorace transverso, lateribus 
rotundatis, dorso nigro maculato, crebre et fortiter punctato, disco posteriori utrinque excavato; elytris 
oblongis, apicem versus ampliatis, lateribus serratis, ante angulum posticum sinuatis, angulo ipso late - 
extrorsum dilatato, fortiter serrato; cupreis, seriato-punctatis, rete irregulari, fortiter sed. irregulariter 
elevatis. 
Long. 22 lin. 
Hab. Guatemaa, Capetillo (Champion). A single specimen. 
Vertex opaque, minutely granulose, and, together with the antennal club, black. 
Thorax nearly twice as broad as long; sides rounded, more quickly converging ante- 
riorly, the anterior angle produced into a stout, subacute, slightly excurved tooth ; 
surface transversely convex, strongly and deeply punctured on the sides, more closely 
and rather less strongly punctured on the middle disc; hinder disc broadly excavated 
on either side, the anterior disc with faint traces of two similar excavations. Elytra 
oblong, slightly dilated posteriorly; sides serrate, sinuate just before reaching the 
posterior angle, the latter broadly dilated laterally, coarsely serrate ; upper surface 
sculptured as in O. scabripennis. 
Separated from the above-named species by its broader thorax and by the much more 
broadly dilated posterior angles of the elytra—in other respects very similar. 
8. Octotoma marginicollis. (Tab. IV. fig. 1.) 
Octotoma marginicollis, Horn, Trans. Am. Ent. Soc. x. p. 300, t. 9. fig. 9. 
Subcuneiformis, depressa, picea, subnitida; subtus nitida, pedibus piceo-fulvis, antennis (basi excepta) scutelloque 
flavis; thorace transverso, rude rugoso-punctato, ante medium et ad basin transversim excavato, flavo, 
piceo maculato ; elytris oblongis, pone medium paullo ampliatis, apice rotundatis, irregulariter serrulatis, 
