FOOD HABITS OF MALLAED DUCKS. 



29 



Table II. — Items of animal food identified in stomachs of mallard ducks and the number 

 in ivhich found — Continued. 



Kind of food. 



Compion 

 mallard. 



Black 

 duck. 



Southern 

 black 

 duck. 



Total niunber of stomachs examined. 



Class Insecta (Insects)— Continued. 

 Order COLEOPTERA (Beetles)— Continued. 



Dytiscidse (predacious diving beetles) — Continued. 



Coptotomus sp 



Dytiscus verticalis • 



Hydrocanthus tricolor 



Hydroporus modestus 



Hydroporus tenebrosus 



Hydroporus sp 



Hydrovatus compressus 



Hydrovatus obesus 



Hydrovatus sp 



Laccophilus decipiens 



Laccophilus Tuaculosus 



Laccophilus proximus 



Unidentified 



Gyriilidse (whirligig beetles). 



Dineutes emarginatus 



Dineuites sp 



Gyrinus analis 



Gyrinus elevatus 



Gyrinus sp 



Hydrophilidse (water scavenger beetles). 



Berosus striatus 



Berosus sp 



Cercyon sp ^ 



Cymbiodyta lacustris ? 



Berallusaltus 



Helopeltis larvalis 



Helophorus sp 



Hydrophilus triangularis 



HydropMlus sp 



Philhydrus ductus 



Tropisternus nimbatus 



Tropisternus sp 



Unidentified 



Silphidse (carrion beetles). 



Necrophorus pustulatus 



Staphylinidse. 



Cafius bistriatus 



Lathrobium longiuscula 



PMlonthus lomatus 



Unidentified 



Scaphidiidse (shining fungus beetles). 



Scaphidium quadriguttatum .: 



Erotylidse (banded fungus beetles). 



Ischyrus quadripuncfatus 



Megalodacnefasciata 



Histeridae (shining carrion beetles). 



Hister dispar 



Hister vernus 



1,725 



622 



