COLEOPTERA — TRICHOPTERYGINA. 241 



PTILIlD/e 

 Actidum attenuatum Cas. columbianum Mat. 



granulosum Cas. humile Mat. 



politum Mat. Ptenidium puMum Maek. 



robustulum Cas. Ptilium coilani — Ptenium. 

 Motschulskium sinuaticolle Mat. columbianum — Ptenium. 



Ptilium coilani Maek. 



Sphaerius politus Horn. 



SPH/ERIID/E. 



8ILPHINA 



SILPHID/E. 



The Silphidee are the carrion beetles. A few species have been called 

 burying beetles because of their habit of excavating beneath the dead animal 

 upon which they are feeding and upon which they lay their eggs. 

 SYNOPSIS OF GENERA. 



Necrophorus: antennse ten-jointed. 



Silpha: front coxal cavities widely open behind. 



Necrophilus. Pinodytes: eyes wanting. Sphaerites: antennae capitate. 

 Agyrtes: epipleural fold narrow. Pteroloma: antennse scarcely thickened 

 at tip. Pelates: antennae arising under a frontal margin. 



Agyrtes longulus Lee. Pelates tenuicorne — Pteroloma. 



liister clabratus — Sphaerites. Pinodytes cryptophagoides Man. 

 Necropliilis hydrophiloides Man. pusio (Horn.) 



confossor — pustulatus. Pteroloma tenuicorne Lee. 



longulus — Agrytes. earaboides Fall. 



tenuicorne — Pteroloma. Silpha genescens — ramosa. 

 Necrophorus guttula Mots. californica — lapponica. 



marginatus Fabr. lappanica Herb. 



nigritus — pustulatus. opaea Linn. 



pustulatus Hersch. ramosa Say. 



vespilloides Herb. Sphaerites glabrates Fabr. 



poilinctor — vespilloides. Sphaerites pusio — Pinodytes. 

 Pelates lautus Man. 



ANiSOTOMID/E. 



Agathidium californicum Horn. morula — curvata. 



eoncinnum Man. obsoleta (Mels.) 



pulchrum Lee. paludieolla Crotch. 



revolens Lee. Catops basillaris — Choleva. 



sexstriatum Horn. californicus — Ptomophagus. 



virile Fall. cryptophagoides — Pinodytes. 



Amphicyllis picipennis — Cyrtusa. pusio — Ptomophagus, 



Anistoma eollaris Lee. Choleva basillaris (Say). 



curvata Man. californicus — Ptomophagus. 



dificillis Horn. clavatum — Colon. 



humeralis Horn. inerme — Colon. 



