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(a) Male i^enital segments. 



The terminal segment in the male is in the form of a chitinons 

 cylinder, whose profile often affords good specific characters; 

 this is the pygophor. On Looking at this from behind, it is 

 seen to be divided into two parts, a smaller dorsal cavit\', the 

 anal tnbe ; and a larger ventral one, the genital tube. 



The anal tube contains the uiobile anal style,* while the geni- 

 tal tube contains the following: 



(i) the mobile genital styles which are articulated near the 

 ventral margin, being situated more or less horizontally on look- 

 ing into the tube. 



(2) the oedeagus, which is situated about the middle of the 

 ])\gophor and is more or less vertical on looking into the tube, so 

 that the ]n'gophor must be tilted to observe the former properly. 

 It is perforated by the muscular, protrusible, penis ; 



(3) the lateral margins of the pygophor are often thickened 

 and dilated and also interiorly produced into hooks or spines. 

 There are also hooks or spines close to, or proceeding from, the 

 wall between the anal tube and the genital tube, and also on the 

 I)osterior margin of the pygophor. 



The following is a partial synonymy of the parts : 



1 Pygophor =:Pygofer Ed\va.r(\s^Affcrtraegcr VwhQr=^ri(l- 

 I'lir appendix Signoret=IIyp^pygittiii Kolenati. 



2 Anal Tube=.^;;frr/or part of tlic segment Sharps A fterrohr 

 Rfelichar.. 



3 Anal Sty\e^=Rectal caiida Sharp=.lfferstielelieii Fiebcr. 

 This is the termination of the alimentarv canal. 



4. Diaphragm =ir/? (7 transverse deflected wall separating the 

 anal tnbe from the genital tnbe (Sharp). 



5 r)edeagus=rPorfr penis F\^hcr=^Penistrager Melichar. This 

 is the "part of the male organs through which pass the mem- 

 branous structures connected with the ejaculatory duct." 



6 Genital Sty]es-= Lateral accessory pieces Sharp=.S"/3'/(' and 

 Criffel Fieber^Cfrrz of some authors. 



7 \'entral Margin of Pygophor=Po.y/(';-/tir edge of segment=: 

 Lip Sharp. 



The various hooks are not speciallv named. 



* This has sometimes been omitted in the drawings. 



