carus, Lee. 

 Bradycellus vulpeculus, Say. 



rupvestris, Say. 

 Anisodactylus I'usticus, Dej. 



nigrita, Dej. 



discoideus, Dej. 



baltimorensis, Say. 

 {Xestonotus) lugubria, Dej. 

 {Amphasia) interstitialis, Say. 

 {Sponyojms) verticalis, Lee. 



Haliplid.e. 



Haliplus triop.sis, Say. 



ruiicollis, Dej. 

 Cnemidotus 12-punetatus, Say. 



Dytiscid^. 



Laccophilus maculosus, Germ. 

 Hydroponis, injequalis, Fabr. 



hybridus, Aiibe.* 



affinis, Say. 



rotundatus, Lee. 



consimilis, Lee. 



s])ui"ius, Lee. 



modestus, Aube 



diclivous, Mels.* 



americanus, Aube?* 



signatus, Mannh. 



tvistis, Payk. 



notabilis, Shai-p.* 



sj). near pei'siniilis, Ci-. 



three unnamed species. 

 Coptotomus interrogatus, Fabr. 

 llybiosoma bifarius, Kirby. 

 zVgabus, sp. 



aeneolus, Cr. 



stagninus, Say. 



punetulatus, Aube. 

 Rhantus binotatus, Harris. 

 Co]ymbetes sculptilis, Harris. 



longulus, Lee. 

 Dytiscus Harrisii, Kirby. 



faseiventris, Say. 



Cordieri, AuV)e. 

 Aciliiis fraterauR, Hairif. 



Gyrinid^. 



Dineutes assimilis, Aube. 

 Gyrinus borealis, Aube. 

 two unnamed species. 



Hydrophild.e. 



Plelopborus lacustris, Lee, 



obscurus, Lee. var.^ 



lineatus, Say. 



tuberculatus, Gyll. 

 Hydrochus rufipes, Mels.* 

 Hydraena pennsylvaniea, Kiesw, 

 Hydiophilus glaber, Hb. 

 Ochthebius sp. 

 Hydrocharis obtusatus, Say. 

 Berosus striatus, Say. 

 Pbilhydrus cinctus, Say. 



diffusus, Lee. 



perplexus, Lee. 



sp. 

 Hydrocombus lacustris, Lee. 



rotundatus, Say. 

 Hydrobius fuseipes, Linn. 



feminalis, Lee.* 



subeupreus, Saj'. 

 Cereyon prastextatura, Say. 



])ygma3um. 111.* 



unipunetatum, Linn. 



several unnamed species. 

 Cryptopleurum vagans, Lee. 



SlLPHID^. 



Necropliorus pustulata, Hersch. 



orbicollis. Say. 



tomentosa, Web. 

 Silpha surinamensis, Fab. 



lapponica, Hb. 



noveboracensis, Foi'st, 



intequalis. Fab. 



araericana, Linn. 

 Choleva terrainans, Lee. 

 Prionocha?ta opaca, Lee. 

 Hydnobius, substriatus, Lee* 

 Anisotoma punctostriatus, Kirby, 



