2G8 



Mr. B. F. Cummings on the 



mounted specimens of the genus Trichodectes in the collection 

 of the British Museum, but no trace of teeth could be found. 



In the crop of Goniodes fakicomis (fig. 1, p. 267) there is a 

 patch of small teeth in the anterior diverticulum of the crop (d). 

 The teeth are arranged in short scattered rows of two, three, 

 or four, and are short, sharp, and stout, with enlarged bases. 

 The lining of the crop is grooved longitudinally, and along 

 each groove is a row of wide-spaced, short, minute hairs. 



This patch of teeth in the anterior caecum of the crop is 

 characteristic of the Ischnocera. I find similar patches in 

 the same areas in Nirmus (N. prodicepis, D., N.fuscus, N., 

 N. dixocephalus, N.), Goniodes sti/Ufer, N., G. colchicus, D., 

 Dochophorus alcedinis, D. ; and Lipeurus feroa, Gieb. (fig. 2). 



ng.3. 



pig, o. — Sketch of the upper part of the alimentary canal of Lipeurus 



ferox. 

 Fig. 3.— Sketch of the upper part of the alimentary canal of Hetero- 



doxus longitarsus. 



a, oesophagus; b, ventriculus ; c, crop; d, patch of teeth. 



