GENERAL BIOLOGY 



FIG. 286. A diving beetle (Coptotomus 

 inierrogatus) . The scutellum is the 

 small triangular piece lying between 

 the bases of the wing-covers, or eleytra. 



FIG. 287. Diagram of the vemral as- 

 pect of a diving beetle (Coptotomus in- 

 terrogates) a, antenna; b, mouth; c, c, 

 coxal cavities for the fore and middle 

 legs; d, labial palpi ;e, eye;/, maxillar 

 palpi; g, lateral margin of the proth 

 rax; h, epipleura of the wing cover (el 

 tron) ; i, prosternal process; i, metaste 

 nal fork; k, hind coxa with /', the inn 

 and o, the outer laminae; p, the coxa 

 process and q, the coxal notch; r, .tr 

 chanter of the hind leg; 5, femur; 

 tibia; u, hind tarsus of five joints; 

 spu sof the middle tibia. /, 2, 3, 4, j, 

 ventral abdominal segments, st l . st 2 , s 

 sterna of pro-, meso-, and meta-thorax 

 respectively; w, wing of the metaste 

 num. m, episternum, and n, epimerc 

 of the successive thoracic segments. 

 The coxal line is the line ex -ending be- 

 tween / and o in the figure, and the 

 coxal border is the part of the coxal process, p, that is marked off laterally 

 by the posterior end of the coxal line. 



