30 



BULLETIN 720, XT. S. DEPARTMENT OF AGRICULTURE. 



Table 1 1 . — Items of animal food identified in stomachs of mallard ducks and the number 

 in vhich found — Continued. 



Kind of food. 



Total number of stomachs examined. 



Class INSECTA (Insects)— Continued. 

 Order COLEOPTERA (Beetles)— Continued. 

 Parnida'. 



Elwis vittatus 



Pelonomus obscums 



HeteroeeridGe (mud beetles) . 



Heterocerus brunneus 



Heterocerus collaris 



Heterocerus tristis 



Elateridffi (click beetles). 



Drasterius elegans 



Drasterius sp 



Unidentified 



Lucanidae (stag beetles). 



Passalus cornutu^ 



Passalus sp 



Scarabaeidse (leaf chafers). 



Atsenius cognatus - 



Atxnius strigatm - 



Atxnius sp 



Aphodius sp 



Canthon sp 



Chalepus trachypygus 



Claotus glohosus 



Onthophagus hecate 



Onthophagus pennsylvanicus 



Onthophagus sp 



Phanxus carnifex 



Phyllophaga sp .x- 



Unidentified 



Chrysomelidae (leaf beetles). 



Cerotoma caminea 



Donacia sp 



Haltica rufa 



Myoehrous denticoUis 



(Edionychis concinna 



(Edionychis scalaris 



Systena hudsonias 



TypophoTUS canellus 



Unidentified 



Tenebrionidse. 



Anxdus brunneus 



Blapstinus sp 



Opalrinus notus 



TrihoUum ferrugineum 



Unidentified 



Anthicidae (flower beetles). 



A nthicus sp 



Tomoderus iiUerruptus 



Common 

 mallard. 



Black 

 duck. 



