100 



ANATOMY Otr AN ARTHROPOD. 



being much larger. It may be obtained in number.s from any 

 of our docks, and is often present in such hordes on board ship 

 as to be a great nuisance. 



The Cockroach. 



The whole insect will be observed at first sight to be covered 

 with a chitinous exoskeleton, which is thick and hard, dark 



— STRDf-rrRK OF AN ARTHROPOD (Periplaiiil<' ancncana). 



H, head; Tli, thorax; Ah, abdomen; Mxp, maxillary palps; Lp, labial palps; M. 

 maxillffi ; Ant, antennae ; E, eyes ; Ep, epicranium ; /, fenestra' ; P, prothorax ; M, 

 mesothorax ; Me, metathorax ; tv, cerci ; S, styles ; Miv and jl/ci'', meso- and meta- 

 thoracic wings; Fl, M.l, and Mc.l, legs; Fe, femur ; 7'i, tibia; Tr, tarsus; 1-10, 

 abdominal segments. 



brown in colour, but paler and softer between the somites. 

 The body of the cockroach is divided up into a number of 

 rings or segments, which are movable upon one another except 



