MOLE-CRICKET 



335 



present peculiarities worthy of notice. Salivary glands and 

 reservoirs are present ; the oesophagus is elongate, and has on 

 one side a peculiar large pouch (Fig. 207, c) ; beyond this is the 

 gizzard, which is embraced by two lobes of the stomach. This 

 latter organ is, beyond the lobes, continued backwards as a 

 neck, which subsequently becomes larger and rugose-plicate. On 

 the neck of the stomach there is a pair of branching organs, 

 which Dufour considered to 

 be peculiar to the mole- 

 cricket, and compared to a 

 spleen or pancreas. The single 

 tube into which the Mal- 

 pighian tubules open is seated 

 near the commencement of 

 the small intestine. These 

 tubules are very fine, and are 

 about one hundred in num- 

 ber. The arrangement by 

 which the Malpighian tub- 

 ules open into a common duct 

 instead of into the intestine 

 itself appears to be charac- 

 teristic of the Gryllidae, but 

 is said to occur also in 

 EphippigerOn a genus of 

 Locustidae. According to 

 Leydig 1 and Schindler the 

 Malpighian tubules are of 

 two kinds, differing in colour, 

 and, according to Leydig, in 

 contents and histological 

 structure. Near the posterior 

 extremity of the rectum 

 there is a tabulated gland 

 having a reservoir connected 

 with it ; this is the chief 

 source of the foetid secretion the mole-cricket emits when seized. 

 The nervous chain consists of three thoracic and four abdominal 

 ganglia ; these latter do not extend to the extremity of the body ; 

 1 Mailer's Arch. 1859, p. 159. 



- 2( ^- Alimentary canal and appendages of 

 the mole - cricket : a, head ; b, salivary 

 glands and receptacle ; c, lateral pouch ; d, 

 stomato-gastric nerves ; e, anterior lobes of 

 stomach ; /, peculiar organ ; </, neck of 

 stomach ; h, plicate portion of same ; i, rec- 

 tum ; Jc, lobulate gland ; I, extremity of body ; 

 m, Malpighian tubes. (After Dufour.) 



