82 July, 1846. 



the latter, and it receives near its middle, where it undergoes a narrow- 

 contraction, the biliary vessels. The contained mass of the stomach and 

 duodenum has a pultaceous consistence. 



The ilium (Fig. 8, e.) is not more than four lines in length, is exceedingly 

 contracted, and opens directly into the rectum. 



The rectum (Fig. 8, f.) is about the same length as the ilium, is mode- 

 rately capacious, and has thick musculo-epithelial parities. It presents 

 internally several columns or longitudinal folds, which give a columnar 

 appearance to the excrement of the animal. The anus opens at the extre- 

 mity of the last abdominal segment between the caudal appendages. 



The salivary glands (Fig. 8, g.) two in number, are placed laterally upon 

 the anterior part of the oesophageal crop. In structure they are of the 

 highest order, being granulated or conglomerate, one of the rarest forms in 

 the economy of insect life. Their ducts open into the mouth. 



The biliary vessels (Fig. 8, h. Fig. 11,) are numerous, moderately long, 

 and form a double attachment to the duodenum. They are connected at their 

 commencement to the external tunic of the duodenum just above the middle, 

 in three rows, (Fig. 10,) one below the other, from whence they pass down- 

 wards nearly to the termination of the duodenum, then doubling upon them- 

 selves, running forwards, they finally form the connection of entry about 

 the middle of the duodenum, at the contraction before mentioned, (Fig. 11.) 

 When highly magnified, they present a structure of basement membrane 

 filled interiorly with organic nuclei and cells, (Fig. 12.) 



The Generative apparatus. In the female: The ovaries (Fig. 8, i.) two in 

 number, are placed within the abdomen on each side of the duodenum, and 

 are about 18 lines in length. Each ovary consists of numerous ovigerous 

 tubes (Fig. 13, a.) 4 or 5 lines in length, which commence very narrow, gra- 

 dually dilate, and join a common tube, the oviduct. The ovigerous tube 

 contain ova in various stages of development, from a mere point at their 

 commencement to the fully formed ovum at their termination. The perfected 

 ova measure l lines in length, are oval and smooth. The oviducts (Fig. 

 8, j, Fig. 13, b.) are narrower and pass backwards and join each other be- 

 neath the ileum to form a common canal, the vagina. The vagina (Fig. 

 13, c.) is 2 lines long, its external orifice is placed between an oval ventral 

 plate (Fig. 13, d. Fig. 14, a.) articulating with the extremity of the ventral 

 plate of the sixth abdominal segment, and an upper convex plate provided 

 with four curved and pointed forceps, (Fig. 13, e.) articulating with the 

 seventh abdominal segment, which probably acts the part of an ovipositor. 



In the male, the genitalia are very simple. The testes (Fig. 15, a.) consist 

 of a pair of comparatively thick and short tubes, forming each a single con- 

 volution, and joining each other beneath the ilium to form the ductus ejacu- 

 latorious (Fig. 15, b.) which proceeds to the penis. The penis (Fig. 15, c.) 

 is external to the body, and is placed below the eighth abdominal segment, 

 but articulates with the seventh. It is short, semi-oval in form, with a short 

 pointed process behind, is enveloped by chitinous membrane, and is received 

 in a calx (Fig. 15, d.) formed of chitine, which articulates with a small con- 

 vex segment attached to the ventral plate of the seventh abdominal segment. 



