OCTOTOMA.—BRACHYCORYNA. 89 
angulo postico extrorsum vix producto, rotundato; seriato-punctatis, rete elevato, irregulari ante medium 
minus elevato et laxius reticulato; flavo-piceis, macula parva basali, altera discoidali, vix ante medium 
posita, margineque apicali, flavis: femoribus inermibus. 
Long. 24 lin. 
Hab. Nortu America, Arizona (Horn).—Mexico, Monclova in Coahuila (Dr. Palmer), 
Guanajuato (Saillé). 
Vertex impressed with a shallow groove. Antenne rather longer than the head and 
. thorax ; joints cylindrical, the five upper ones forming an oval club, the two lower ones 
pale piceous. Thorax transverse ; sides straight and nearly parallel from the base nearly 
to the apex, thence quickly converging to the anterior angle, the latter produced into a 
subacute tooth ; disc coarsely and closely rugose-punctate, transversely excavated before, 
and again behind the middle, the space between forming an ill-defined transverse 
elevation, from the middle of which a short perpendicular ridge runs backwards to the 
basal margin, dividing the hinder depression into two sections. Elytra oblong ; sides 
parallel anteriorly, slightly dilated behind the middle, rounded at the apex, the hinder 
angle slightly produced laterally, broadly rounded; outer margin finely but distinctly 
serrulate ; disc punctate-striate, the whole surface covered with a number of raised 
piceous reticulations, which form an irregular network over the surface, more especially 
on the hinder half, the reticulations on the anterior disc being less raised and ana- 
stomosing less freely with each other than those behind the middle of the elytra ; an 
irregular longitudinal ridge running upwards from the middle disc to the basal margin. 
Broader and shorter than O. scabripennis, the reticulations on the anterior half of 
the elytra less distinctly raised ; more variable in tint, in some specimens the entire disc 
being dark piceous ; in one from Guanajuato the anterior disc (including its reticulations) 
is pale piceo-fulvous. ‘This insect, described under the above name by Dr. Horn, agrees 
_ with O. plicatula, Fabr., a North-American species; but differs from 0. scabripennis and 
O. championé in its femora being unarmed. | 
** Elytra seriate-punctate ; interspaces plane or costate. 
a. Antenne not longer than the head and thorax together, four to five upper joints 
forming a distinct club. 
ar BRACHYCORYNA. 
Brachycoryna, Guérin, Icon. du Régne Anim. iii. Texte, p. 280. 
Corpus breviter oblongum, convexum. Caput inter oculos fere planum, antrorsum non productum ; antennis 
quam caput cum thorace brevioribus, articulis brevibus, cylindricis, ultimis quatuor vel quinque incras- 
satis, clavam ovatam formantibus. Thoraw transversus. Hlytra elevato-vittata, interspatiis biseriato- 
punctatis. Pedes breves, simplices ; unguiculis contiguis. 
The late Dr. Chapuis, in his ‘ Genera des Coléopteres,’ has omitted all notice of the 
- BIOL. CENTR.-AMER., Coleopt., Vol. VI. Pt. 2, February 1886. mm 
