4-28 Dr. Kkld on the Anatomy of the Mule-cricket. 



I certainly found tlieni most distinctly developed in a male in- 

 dividual. 



But my acquaintance with the interesting insect, the history 

 of which has forined the subject of this paper, did not com- 

 mence till towards the close of that period of the summer 

 during which the animal is heard to produce its peculiar 

 sound : and I propose therefore to resume the investigation of 

 this point at a future opportunity. 

 Oxford, Nov, 13, 1824. 



Dimensions of a full gro^sn Mole-cricJcet. 

 Length of the body from the extremity of the lip to Inches. 



the extremity of the vent 2*0 



Length of the head 0*165 



thoracic division 0*5 



abdominal division 1*33 



Breadth of the thorax 0*5 



abdomen 0*5 



Length of the antennae of the head 0*825 



. caudal antennae 0*666 



' whole alimentary canal 2*0 



— oesophagus 0*5 



Length from the crop to the great intestine .... 0*5 

 Length of the great intestine 1*0 



Explanation of the Plates IL and III. 



Fig. 1. Skeleton of the head, viewed from the under side. 



Fig. 2. A side view of the animal in its common attitude. 



Fig. 3. Skeleton of the thorax. 



Fig. 4. Sternum, &c. with the upper part of the thorax ad- 

 hering. 



Fig. 5. Exterior surface of the left fore leg. 



Fig. 5^. Parasitic insect infesting the roots of the wings ; of 

 its natural size, and also enlarged. 



Fig. 6. (Esophagus, crop, gizzard, caeca, great intestines, he- 

 patic organ, and anal glands. 



Fig. 7. Interior view of gizzard. 



Fig. 8. Ditto of a portion of ditto. 



Fig. 9. Intestinal worm of the mole-cricket; natural size, 

 and enlarged. 



Fig. 9*. Upper part of great intestine, with four rows of 

 glands, and the orifice of the hepatic duct. 



Fig. 10. The stigmata of the left side ; with tlie organ (situ- 

 ated between the fourth and fifth stigmata) described in p. 414'. 



Fig. 11. The nine ganglions. 



Fig. 12. The brain, surrounding the oesophagus. 



Fig. 13. The female sexual organs. 



Fi". II'. The mul- uiito. LXIV. On 



