ERCHOMUS. 301 
destitute of exserted sete, and although the mesosternal carina is but little elevated, its 
anterior part shows a small prominent angle; the impression along the side of the wing- 
case, too, is peculiar, and causes the lateral margin to project further outwards than in 
any other species. 
8. Erchomus chontalensis. 
Latus, depressus, piceus; antennarum basi pedibusque testaceis; thorace elytrisque opalescentibus, nitidis, fere 
impunctatis ; abdomine crebre subtiliter punctulato, parum nitido ; elytris lateribus explanatis, angulo 
externo rotundato. 
Long. 4 millim. 
Hab, Nicaragua, Chontales (Janson). 
Antenne rather elongate; fifth and sixth joints each much longer than broad; 
tenth scarcely so long as broad; extremity of terminal joint pale. Base of thorax 
distinctly sinuate on each side, hind angles not prolonged, quite obtuse. Lateral 
margin of elytra explanate; thus no intramarginal impression appears to be present, 
the sides being curved towards the hind angle, which is broadly and completely rounded. 
Exserted sete of hind body elongate. 
This is a peculiar and very distinct species; the mesosternal carina between the 
middle coxz is only very slightly elevated, but in front of it there is a distinctly rather 
more elevated prominent angle; the tarsi are elongate and slender; the tibie only 
feebly spinose. Only a single, very damaged example has been received. 
9. Erchomus affinis. 
Depressus, nigerrimus, nitidus ; antennis fuscis, basi, palpis pedibusque testaceis; thorace parce subtiliterque 
punctulato, nitidissimo, basi utrinque leviter sinuato, angulis posterioribus leviter retrorsum spectantibus ; 
elytris crebre subtiliter punctatis, secundum marginem lateralem canaliculatis; abdomine crebre subtiliter 
punctato. 
Long. 3 lin. 
Hab. GuatEMata, Guatemala city (Champion). 
This species is very similar to both FE. truncatus and E. segnis, and its individuals are 
intermediate in their stature between those species ; it is readily distinguished from the 
former by the more closely and distinctly punctate hind body and by the shape of the 
hind angles of the thorax, and from E. segnis by its smaller size, less punctate hind 
body, and rather shorter antenne. It is almost equally near to the Amazonian 
E. scutellatus, but that species has the punctuation of the hind body much coarser. 
One of the two individuals found has the elytra picescent, probably as the result of 
immaturity. 
10. Erchomus segnis. 
Depressus, nigerrimus, nitidus; antennis fuscis, basi, palpis pedibusque testaceis ; antennis sat elongatis, articulis 
nullis transversis ; thorace parce subtiliterque punctulato, nitidissimo, basi utrinque leviter sinuato, angulis 
