Rei'ision fies granits Hydrophiles. 195 



20. Elytra posterius inter séries ordinarias manifeste geminato- 



striata; segmenta 2-o laterilms angusle laniiginosa. 



— (Species palaearcticae) 21 . 



— Elytra posterius inter séries ordinarias haud vel indisliutle 



geminato-striata ; segmenta 2-o lateribus latins lanugi- 

 nosa. — (Species americanae)- 26. 



21. Linea média segmentorum 2-o tecliformis vel elevato-ca- 



rinala 23. 



— Linea média segmentorum 2-4 simpliciter convexa, seg- 



mentum o postice plicatum, subcarinatum 22. 



22. Segmentorum 2-o margo tomentosus continuus, minime 



interruptus 2o. aterrimus. 



— Segmentorum 2-o margo tomentosus interruptus, in ma- 



cula antica reductus 26. g^ansuensis 



23. Eiytrorum angulus suturalis denticulo armatus 24. 



— Eiytrorum angulus suturalis apice rotundatus. — c5 tars. 



ant. articulus o in jaminam acute trlangiilarem expansus 

 24. pistaceus. 



2i. Carina sternalis aniice in utroque sexu similiter auguste 

 caualiculata, cuspide dimidium segmenfi 2 haud attin- 

 gente. — (5 tars. ant. articulus o in laminam Ijrevem 

 expansus, unguibus haud dilatatis 21. acuminatus. 



— Carina sternalis (3 antice dilatata et fovea lata ovali ins- 



tructa, ç tantummodo Icviter depressa. — c5 tars. ant. 

 articulus o in laminam obtuse triangularem valde expan- 

 sus, unguis exterior plus minus dilatatus 2o. 



25. Cuspis carinae sternalis dimidium segmenti 2 vix attingens ; 



eiytrorum angulus suturalis vix denticulatus. — c5 un- 

 guis (^xterior fortiter dilatatus, spathuliformis 



23. unguicularis, u. sp. 



— Cuspis carinae sternalis dimidium segmenti 2 fere semper 



superans ; eiytrorum angulus suturalis distincte et argute 

 denticulatus. — cJ unguis exterior leviter dilatatus, 

 elongatus, haud spathuliformis 22. piceus. 



26. Segmentum 2 transversim et latissime glabratum 27. 



— Segmentum 2 triangulariter glabratum 31. 



27. Eiytrorum apex denticulatus; segmentorum 2-5 margo to- 



