152 TRICHOPTERYGIDZ. 
vix marginatis, margine basali leviter convexa angulis obtusis; elytris ovatis, quam caput atque pronotum 
longioribus, haud latioribus, ante media latissimis, valde convexis, nitidissimis, fere glabris, punctis paucis 
indistinctissimis notatis, apice rotundato; pedibus atque antennis modicis, lete flavis. Long. corp. 
3; lin.=1 millim. 
Head \arge, rounded in front, shining, glabrous, impunctate; eyes large and prominent; antenne moderate, 
bright yellow. Thorax moderate, rather longer and wider than the head, widest at the base, very convex 
and shining, with a few very indistinct minute punctures on the disc, but no basal fovee ; sides moderately 
rounded, scarcely margined; basal margin slightly convex, with the angles obtuse. Scutellum large, 
triangular, glabrous. lytra ovate, rather longer but scarcely wider than the head and thorax, widest 
before the middle, glabrous and shining, with a few very indistinct minute punctures; sides faintly mar- 
gined; apex obtuse, fuscescent. Legs moderate, bright yellow. Underparts black, with the mouth and 
the coxe yellow. 
Hab. Nicaracua, Chontales (Janson 1). 
One specimen. 
This insect differs from P. druckii, Matth., in the absence of the basal fovee of the 
thorax; from others of the genus in its shining glabrous surface. 
6. Ptenidium impunctatum. 
Ptenidium impunctatum, Matth. Trans. Am. Ent. Soc. xi. p. 150°. 
Elongato-oblongum, piceum, valde convexum, nitidissimum; capite magno, lato, oculis magnis; pronoto sat 
magno, transverso, quam caput latiore haud longiore, valde convexo, impunctato, glabro, nitidissimo, 
lateribus rotundatis et marginatis, margine basali recta angulis obtusis ; elytris ovatis, obtusis, quam caput 
atque pronotum angustioribus vix longioribus, convexis, nitidissimis, fere impunctatis, lateribus marginatis 
ad media latioribus, apice obtuso late rufescente ; pedibus atque antennis modicis, lete favis. Long. corp. 
*7 lin.=0-75-0-87 millim. 
Head large and broad, shining, impunctate; eyes large, moderately prominent; antenne rather short, robust,: 
bright yellow. Thorax large, transverse, wider but not longer than the head, convex, impunctate, and - 
very shining; sides margined and rounded; basal margin straight, with the angles obtuse. Scutellum 
moderate, triangular. lytra ovate, obtuse, narrower but scarcely longer than the head and thorax, 
widest near the middle, convex, very shining, and impunctate; sides margined; apex obtuse, broadly 
rufous. Legs moderate, bright yellow. Underparts piceous, with the head, mesosternum, coxe, and 
abdomen flavescent. 
Hab. GuaTEMALA, near the city, Capetillo, San Gerénimo (Champion '). 
Differs from others of the genus in its bread head and thorax, narrow elytra, and 
impunctate surface. 
Found not uncommonly by Mr. Champion. 
The following species is unrecognizable from the description :— 
Ptenidium fuscipennis. 
Ptenidium fuscipennis, Motsch. Bull. Mosc. xh. part 2, p. 190°. 
Hab. Istumus of Panama (Motschulsky *). 
