526 



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 elytra. 



Fig. 287. Diagram of the ventral as- 

 pect of a diving beetle {Coptotomus in- 

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

 coxal cavities for the fore and middle 

 legs; d, labial palpi; ^, eye;/, maxillary 

 palpi; g, lateral margin of the protho- 

 rax ; h, epipleura of the wing cover (ely- 

 tron) ; i, prosternal orocess; j, metaster- 

 nal fork; k, hind coxa with /, the inner 

 and 0, the outer laminae; p, the coxal 

 process and q, the coxal notch; r, tro- 

 chanter of the hind leg; s, femur; t, 

 tibia; u, hind tarsus of five joints; v, 

 spu s of the middle tibia. /, 2, j, 4, 3, 6, 

 ventral abdominal segments, sf^ , st^, sP, 

 sterna of pro-, meso-, and meta-thorax, respectively; w, wing of the metaster- 

 num. m, episternum, and n, epimercn of the successive thoracic segments. The 

 coxal line is the line extending between / and o in the figure, and the coxal bor- 

 der is the part of the coxal process, p, that_is marked ofE laterally by the posterior 

 end of the coxal line. 



