Fig.  20. — Chilopoda :  external  genitalia.
<p>A,  <i>Scolopendra</i>,  posterior  end  of  body  of  embryo,  showing  two  small  segments in  genital  region  between  last  leg-bearing  segment  and  telson  (from  Heymons, 1901).  B,  <i>Scolopocryptops</i>,  male,  terminal  part  of  body  with  penis  protracted. C,  same,  female,  genital  and  anal  segments.  D,  same,  male,  genital  and  anal segments,  lateral  view.  E,  same,  male,  posterior  end  of  body,  ventral  view. F,  <i>Lithobius</i>,  female,  posterior  end  of  body,  ventral  view.  G,  same,  corresponding segments  of  male.  H,  same,  female,  lateral  view  of  posterior  body  segments. I,  same,  male,  ventral  view  of  penis  and  ducts.  J,  <i>Scutigera  forceps</i>,  male, posterior  end  of  body,  ventral  view.  K,  same,  corresponding  segments  of female,  ventral  view.
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An,  anus ;  Cx,  coxa ;  Cxpd,  coxopodite ;  Dct,  genital  duct ;  Gp,  gonopod : iGp,  2Gp,  first  and  second  gonopods ;  gS,  genital  sternum;  igS,  2gS,  first  and second  genital  sterna ;  igSeg,  first  genital,  or  pregenital,  segment ;  sgSeg, second  genital,  or  genital,  segment;  gT,  genital  tergum;  Pen,  penis;  Sex,  sub- coxa;  Stn,  sternum;  T,  tergum;   Tel,  telson;  Tr,  trochanter.
Robert Evans Snodgrass
1937
Snodgrass, Robert Evans. 1936. <a rel="nofollow" class="external text" href="https://archive.org/details/smithsonianmisce951937smit/page/n444/mode/1up">Morphology of the insect abdomen. Part III. The male genitalia (including arthropods other than insects).</a> Smithsonian Miscellaneous Collections. 95:1–96.