ANATOMICAL AND HISTOLOGICAL STUDIES OF THE 
DIGESTIVE CANAL OF CIMBEX AMERICANA LEACH. 
HENRY H. P. SEVERIN' AND HARRY C. M. SEVERIN'. 
(With Plates I-IV) 
The digestive canal of various Hymenoptera has been de¬ 
scribed by many authors, viz., Swammerdam (27), Reaumur 
(22), Treviranus 1 , Brandt and Ratzeburg (7), Burmeister (8), 
Newport (20), Dufour (11), and more recently by Schie- 
menz (23) and Bordas (2, 3, 5, 6). A few of these authors 
have extended their investigations to different species of the 
family Tenthredinidae. Burmeister has described the alimen¬ 
tary canal of Tenihredo nigra. Newport has worked on the 
anatomy of Athalia centifoliae. He described and figured the 
digestive canal of this species and did some work on the hi> 
tological structure. Dufour (11) described and figured the 
anatomical relations of the digestive organ of a number of 
species of Tenthredinidae. More recently, Bordas (2, 3, 5, 6) 
investigated a number of species belonging to this family. His 
researches on the histological structure of the digestive canal 
were extended to several genera belonging to various families 
of Hymenoptera often not closely related. 
The material for the present research was obtained in 
and near the city of Milwaukee, Wisconsin. The in¬ 
sects were all collected during June and the early part of July, 
usually upon the peach-leaved willow ( Salix amygdaloides An¬ 
ders.) and the long-leaved willow ( Salix longifolia Muhl.). 
i Paper not accessible. 
