Moser, Neue Melolonthiden von Mittel- und Süd- Amerika. 159 



I s 07i y c hu s c er vinus Er. = (abdominalis Mos.). 

 Obgleich Erichson die Art nach, einem cf beschrieben hat, 

 erwähnt er in seiner flüchtigen Beschreibung nicht die Charakte- 

 ristik des Abdomens. 



I s o n y chus v entr alis n. sp. 



Ovatus, rufo-fuscus, dense flavo-cinereo- vel cinereo-pilosus. 

 Capite, fronte dense pilosa, clypeo parce erecte piloso , margine 

 antico late rotundato ; antennis ferrugineis ; prothorace latiore 

 quam longiore , antrorsum angustato , lateribus leviter curvatis, 

 angulis anticis paulo acutis, angulis posticis obtusis, dorso crebre 

 punctato, punctis pilosis ; elytris striatis , dense pilosis , inter- 

 stitiia alternis angustioribus, interstitio secundo angusto maculis 

 nonnullis indistinctis pallidioribus instructo ; pygidio maculis dua- 

 bus fuscis, postice convergentibus ornato. Subtus dense pilosus, 

 abdominis segmento penultimo in mare postice medio triangulariter 

 retrorsum lobato , segmento ultimo medio antice triangulariter 

 exciso, utrinque juxta medium macula fusca ornato; abdominis 

 segmento penultimo in femina haud lobato, segmento ultimo nee 

 exciso, nee maculato ; pedibus rufis, pilosis. — Long. 6,5 mm. 



Para. Mus. Berol. 



Isonychus paranus n. sp. 



Oblongo-ovalis, fuscus, griseo-pilosus. Capite, fronte setis 

 adpressis obteeta, clypeo erecte setoso, margine antico rotundato; 

 antennis rufo-flavis ; prothorace latiore quam longiore, antrorsum 

 angustato, lateribus curvatis, angulis anticis paulo produetis, 

 acutis , angulis posticis obtusis , dorso dense punctato , punctis 

 griseo-pilosis ; scutello crebre pilifero-punetato ; elytris striatis, 

 griseo-pilosis, maculis nonnullis irregulaiibus obscurioribus, inter- 

 stitiis alternis latioribus et paulo convexis ; pygidio dense griseo- 

 piloso, maculis duabus basalibus semiannulatis ochraeeis, margine 

 postico paulo reflexo. Subtus crebre cinereo-pilosus. — Long. 

 9 mm. 



Para. Mus. Berol. 



Isonychus fuscomaculatus n. sp. 

 cf. I. maeulipenni Mos. similis , major, prothorace postice 

 latiore. Fuscus, cinereo-pilosus, elytris fusco-maculatis. Capite, 

 fronte setosa, clypeo nitido, margine antico late rotundato ; an- 

 tennis rufo-flavis, flabello paulo obscuriore ; prothorace latiore 

 quam longiore, antrorsum angustato, lateribus curvatis, angulis 

 anticis fere reetangulis , angulis posticis obtusis, dorso dense 

 cinereo-piloso ; scutello cinereo ; elytris striatis , cinereo-pilosis, 



