ANNALS 



O F 



The Entomological Society of America 



Volume I J U N E . 1 9 8 Number 2 



ANATOMICAL AND HISTOLOGICAL STUDIES OF THE 

 FEMALE REPRODUCTIVE ORGANS OF THE 

 AMERICAN SAW-FLY, CIMBEX AMERI- 

 CANA, LEACH. 



By Harry C. Severin and Henry H. P. Severin. 



(with plates III TO V.) 



The material for the present paper was obtained in Mihvaukee 

 County, Wisconsin. The insects were coUected. during June and 

 the early part of July usually from the peach-leaved willow 

 (Salix amygdaloides Anders.) and the long-leaved willow (Salix 

 longifolia Muhl.) 



ANATOMICAL STRUCTURE OF THE FEMALE REPRODUCTIVE ORGANS. 



The internal female reproductive organs of Cimbex occupy 

 the greater part of the abdominal cavity. The paired ovaries, 

 which embrace the dorso-lateral sides of the alimentary canal, are 

 pale greenish in color and extei]d from the second to the poste- 

 rior end of the seventh abdominal segment (Fig. i, ov). 

 Each ovary is made up of a large number of ovarian tubules 

 arranged in a parallel manner. Anteriorly, these tubules taper 

 gradually into the very fine thread-like terminal filaments, which 

 are twisted together distally, thus holding the two ovaries togeth- 

 er; posteriorly, the tubules of each ovary open into the funnel- 

 shaped oviducts. The two oviducts unite in a forked manner 

 below the alimentary canal to form the common oviduct or ovi- 

 ductus communis. In a dorsal view, the oviductus communis 

 is almost entirely hidden by the spermatheca (Fig. i, sp) and the 

 large reservoir of the colleterial glands (Fig. i, cs). The com- 

 mon oviduct terminates in the vaginal orifice, which is directly 

 below the peculiar notch of the last sternite and the base of the 

 ovipositor (Fig. i6, vo). 



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