32 



BULLETIN 120, U. S. DEPARTMENT OF AGRICULTURE. 



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

 in nhich found — Continued. 



Kind of food. 



Common 

 mallard. 



Black 

 duck. 



Total number of stomaohs examined. 



Class Insecta (Insects)— Continued. 



Order HYMENOPTERA (Ants, Bees, and Wasps). 



Unidentified 



Apoidea (bees) 



Vespoidea (wasps) 



Chrysidoidea (cuckoo wasps) 



Ichneumonoidea (parasitic wasps). 



Hemiteles sp 



Phseogenes sp '. , 



Formicoidea (ants). 



Unidentified 



Formicidaj. 



Camponotus sp 



Formica sp 



Pheidole dentafa 



Ponera opaciceps 



Unidentified 



Tenthredinoidea (sawflies) - 



Class Arachnida. 

 Order ARANEIDA (Spiders). 



Unidentified spiders and cocoons . 

 ScMzogyna sp 



Order ACARIDA (Mites). 



HydrachnidEc (water mites) . 

 OribatidjE 



SUBKINGDOM MollUSCa 1 (MOLLUSKS). 



Unidentified . 



Class Gastropoda (Univalves). 



Unidentified 



Muricida;. 



Nucella lapillus 



Urosalpinx cinertus 



Nassidae. 



Ilyanassa obsoleta 



Nassa acuta 



Nassa ambigua 



Nassa sp '. 



Columbellidaj. 



Anachis avara 



Anachis obesa 



A slyris lunata 



Pleurotomidse. 



ClathureUdjewefii 



Mangilia slellata 



Mangilia sp 



1,725 



1 Besides the species here listed for the southern black duck, Mr. F. C. Baker (O. & 0. 14, p, 139, and Proc. 

 Acad. Nat. Sci. Philadelphia, 1889, p. 207) adds the following: Cylichna oriza, Utriculus canalieulatus, Trun- 

 catella subcylindrica, and Odostomia impressa. 



