202 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
the same width ; the folds are not quite regular, but sinuous in outline, 
though, roughly speaking, they are all parallel to one another. Under 
a higher power, the epithelium is seen to be composed of cells, which, 
viewed from above, present a polygonal outline, varying with each cell, 
as is seen in Fig. 23; the nuclei appear nearly in the center of the. cells; 
they are oval, and coarsely granular, the granules being darkly colored 
by haeraatoxilino and all of nearly uniform size; I failed to detect any 
nucleolus. The relations of the epithelium to the remaining layers 
of the uterine walls appear best in longitudinal sections, because in 
them the folds are cut across. Fig. 22 is taken from a section of a 
uterus distended with eggs, and therefore with the folds very much 
drawn out. The cells of the epithelium, Fig. 22 ep, are " cylinder cells," 
with the large nuclei lying somewhat towards their free or inner ends. 
Their appearance is better shown in the enlarged drawing, Fig. 18 i 
they are sharply separated from one another ; their protoplasm is finely 
granular, the granules being unequally distributed so that some parts 
of the cells appear clearer than others. The free surface of the cells is 
nearly if not quite flat, while their outer ends or those which rest upon 
the connective tissue (conn.) are often rounded ; finally, the cells are not 
all of the same height. Outside the epithelium follows a layer of fibrous 
tissue, in which the trachea? ramify, Fig. 22, and which contains numer- 
ous small, oval nuclei belonging to the cells of the tissue and elongated 
nuclei of the fine tracheal branches, as represented in Fig. 7. Outside 
the connective tissue lie the muscular layers, Fig. 22 muc, the fibres of 
which are all smooth and not striated. They are arranged so as to form 
an internal circular, and a much more powerful external longitudinal 
coat, that is very distinctly shown in Fig. 22. Within, the epithelium 
is covered by a layer of fibrous matter, Gr., that fills up the whole space 
between the uterine walls and the eggs. In many sections there are 
nuclei contained in this mass, closely similar to those in the underlying 
epithelium. As to the nature of this layer and the source of the nuclei 
I cannot venture an opinion. 
The remaining portions of the efferent ducts of the female apparatus 
I have not investigated. I particularly regret my inability to give some 
account of the receptaculum seminis. The reader will find some unsat- 
isfactory, because very brief, notices of the female appendices in Ley- 
dig's Textbook, 277 and a more elaborate monograph 273 by the same author 
giving a general account of the structure of the receptaculum in insects, 
but containing no new observations on the Orthoptera, though in a 
previous article 279 Leydig has described the " Samentasche" in this order 
as being lined by an epithelium, which rests on a tunica propria and 
bears a chitinous cuticula, aud outside of which is a thin layer of striated 
muscle. The part that Dufour 230 calls the u glande sebifiriue'' 1 is really the 
277 Leydig : Lehrbuck tier Histologie, p. 544. 
Nova Acta, xxxiii (18G7). 
'"Mailer's Arch., 1859, p. 8G. 
™<Dnfour: Kecbcrcbes sur les Ortboptdres, 1. c. 325, PI. II, fig. 17 c. 
