A. J. Grove 
15 
interior of the crop appears to be always full of fluid which, in the 
prepared sections, appears as fine granular matter with large clear inter¬ 
spaces. This frequently gives a false impression of a solid crop. This 
point is illustrated in Fig. 13 (Plate I), which is a camera lucida 
drawing of a longitudinal section through such a crop. 
The coiled intestine is the longest portion of the alimentary canal, 
and throughout its entire length it is roughly oval in cross-section, 
being flattened dorso-ventrally (Plate I, Fig. 10). The walls are com¬ 
paratively thick, and large nuclei with definite nuclear bodies occur 
at frequent intervals. Cell boundaries, however, are not at all clear, 
and the nuclei are embedded in a matrix of rather coarse granular 
matter. This fact, coupled with the large size of the nuclei, suggests a 
secretory function for this portion of the alimentary canal; and in the 
complete absence of definite digestive glands, the probability is that 
this is so. 
Fig. 11. Dorsal view of the salivary glands. Semi-diagrammatic. (xl52.) 
sal. gl. ant. = anterior salivary gland. sal. gl. d. = duet of salivary gland. 
sal. gl. post. — posterior salivary gland. 
The rectum differs greatly from the coiled intestine in structure. 
For the greater part of its length, it is composed of a network of 
longitudinal and circular bands of muscle fibres, the circular bands 
being on the outside (Plate I, Fig. 14). The wall is very much thinner 
than that of the coiled intestine, and there are only a few scattered 
nuclei present (Plate I, Figs. 11 and 14). Towards its posterior end, 
where the rectum narrows, the wall becomes much thicker and is 
thrown into folds, thus forming a sphincter muscle for the closing of 
the alimentary canal. 
The salivary glands (Text Fig. 11) of S. rosarum are remarkably 
developed, considering the size of the insect. They consist of two pairs 
