HYPOMIA.—PLERODIA. 123 
HYPOMIA. 
Hypomia, Thomson, Physis, ii. p. 51; Lacordaire, Gen. Col. ix. p. 671. 
The following species, unknown to me, is the only one of this genus yet recorded :— 
1. Hypomia mexicana. 
Hypomia mexicana, Thomson, loc. cit. p. 52. 
Hab. Mexico. 
HYPSIOMA. 
Hypsioma, Serville, Ann. Soc. Ent. Fr. 1835, p. 88; Lacordaire, Gen. Col. ix. p. 675; Thomson, 
Physis, u. p. 45; Bates, Trans. Ent. Soc. 1872, p. 201. 
Hypselomus, Erichson, Wiegm. Archiv, 1847, i. p. 148; Thomson, Class. Long. p. 115; Bates, Ann. 
& Mag. Nat. Hist. xvi. 1865, p. 112 (mec Perty). 
Upwards of thirty species of this genus have been described, all American, ranging 
from Buenos Ayres to Central America. None has yet been recorded from Mexico 
or the West Indies. The genus is distinguished by its compact subtriangular form, 
with very prominent humeral angles, cylindrico-conical unarmed thorax, and strongly 
flexuous third antennal joint. | 
1. Hypsioma picticornis. (Tab. IX. figg. 7, 8). 
Hypselomus picticornis, Bates, Ann. & Mag. Nat. Hist. 1865, xvi. p. 111’. 
Hypsioma signaticornis, Thomson, Physis, ii. p. 48 (1868) ?. 
Hypsioma picticornis, Bates, Trans. Ent. Soc. 1872, p. 201°. 
Hab. Guatemata, San Juan, Vera Paz (Champion); Nicaragua, Chontales (Belé 3, 
Janson); Panama, Chiriqui (42bsé)—Sourn America, Amazons’, Brazil’. 
PLERODIA. 
Plerodia, Thomson, Physis, ii. p. 60; Lacordaire, Gen. Col. ix. p. 670. 
Five species of this genus have been described, all from Tropical South America. 
1. Plerodia degenera. 
Pl. syringi (Bates) proxime affinis et simillima; differt corpore paullo breviore thoracisque tuberculo dorsali 
minus elevato. Fuligineo-fusca, elytris utrinque vitta imconspicua ab humeris versus suturam curvata 
cinerea ; antennis articulis 4°-11™ basi pallidioribus ; thorace cylindro-conico, tuberculo elongato discoidali 
vix conspicuo ; elytris punctulatis, angulo humerali in carinam brevem prolongato. 
Long. 43 lin. 
Hab. GuateMaLa, Zapote (Champion). 
Scarcely distinct from the South-Brazilian Plerodia syrinx ; it is, however, decidedly 
shorter in the body, and the frontal horns in the single male specimen are much shorter. 
r2 
