84 LONGICORNIA. 
SPHENOTHECUS. 
Sphenothecus, Dupont, Mag. Zool. 1888, CL. ix. p. 55. 
Lacordaire suggested that S. cyanicollis, Dup., should be detached from this genus 
and formed into anew one; and Leconte proposed to refer it to Entomosterna: the 
latter author proposed further to divide the remainder of the genus into two; but, 
after a careful examination of many of the allied forms, I think it preferable to retain 
Sphenothecus as Dupont first defined it. The genus relies, then, for its unity more upon 
the vertical front of the mesosternum, the elongated scutellum, and short posterior 
tarsi than on the raised lines of the elytra and the form of the thorax. Eight species 
are now known, all from Mexico and the adjoining countries, north and south. 
1. Sphenothecus tomentosus. 
Sphenothecus tomentosus, Dupont, Mag. Zool. 1838, Cl. ix. p. 56, t. 219. f. 14. 
Hab. Mexico, Oaxaca !. 
2. Sphenothecus trilineatus. 
Sphenothecus trilineatus, Dupont, Mag. Zool. 1838, Cl. ix. p. 57, t. 219. £ 27. 
Hab. Mexico, Jalapa (Hoge); Guaremaua, Tocoy, 6000 feet (Champion). 
3. Sphenothecus bivittatus. 
Sphenothecus bivittatus, Dupont, Mag. Zool. 1838, Cl. ix. p. 58, t. 230. f. 1}. 
Leptocera bilineata, Gory, Icon. R. A. Ins. t. 45. f. 9. 
Hab. Norra America, Texas.—Mexico 1. 
The antenne in the males of this species have twelve joints. 
4, Sphenothecus picticornis. 
Sph. bivitiato proxime affinis et similis, sed differt antennarum articulis 4°-12™ dimidio basali flavo-rufis. 
Niger, nitidus, subtus ochraceo-pubescens ; thorace sparsim punctato lateribus griseo-hirtus, dorso macula 
rufa; elytris utrinque vittis duabus elevatis eburneis, interspatiis depressis punctulatis; antennis ¢ 
12-articulatis, longitudine plusquam dupla corporis, articulo tertio robusto; femoribus tibiisque basi 
castaneo-rufis. 
Long. 7 lin. ¢. 
Hab. Mexico. 
The basal lobes of the elytra are still more advanced towards the thorax than in 
S. bivittatus ; and the scutellum is rather more elongated. 
5. Sphenothecus argenteus. 
Elongatus, postice minus angustatus, niger, nitidus, subtus lateribus argenteo-tomentosis ; thorace medio 
rotundato ibique (?) breviter tuberculato, dorso punctato-strigoso medio antice carinato, basi depressa 
et lobata, lateribus utrinque vitta lata argenteo-tomentosa; scutello angustissimo, elongato ; elytris 
apice breviter truncatis, basi utrinque modice lobatis, dorso utrinque carinis eburneis duabus juxta 
