terminal segments of Halticella, dc. 299 



hijpopygium de Sicliel," as enunciated from time to time. 

 Thus, in the passage ah-eady referred to, where he first 

 speaks of the " hf/popijfiiiun qui est en realite le 7e arceau 

 ventral de Vnhdomen'' (p. 334); and again, on the fol- 

 lowing page, when he adverts to the " 7e segment 

 abdominaV as corresponding with the " epipi/fiiuiii et 

 hypopygimn de Sichel"; he shortly afterwards discusses 

 the relative length of the " arceaux dorsal et ventral du 

 7e segment,' in Chalcis minuta ; and subsequently notices 

 "la presence, dans les PhasganojjJiora, d'mie paire de 

 stigmates sur le 7e arceau dorsal," which, he adds, " se 

 retrouvent exactement avec les memes dispositions chez 

 toutes les especes de Chalcis " (p. 336). 



In all these instances M. Andre is presumably speak- 

 ing of the females, or of both sexes, in the former of 

 which the 6th terminal dorsal segment represents this 

 " ejnpygium de Sicliel,'' the 7t1i having no existence at all; 

 and the projecting apex of the hypopygium presenting 

 only the semblance of an additional dorsal segment. In 

 testifying, therefore, indiscriminately to the existence of 

 these spiracles " sur le 7e arceau dorsal,'" M. Andre 

 unconsciously avows the recognition of the spiraculiferous 

 apex of this "hypopygium de Sichel," which he so 

 strenuously repudiated before. On the other hand, it is 

 mysteriously suggested in a footnote that "Les veri- 

 tables epipygium et hypopygium sont les deux arceaux du 

 8e segment abdominal, invisible et tout a fait transforme 

 chez les Chalcidites" (p. 334); thus recognising also 

 that complicated transformation of these terminal seg- 

 ments which Dr. Sichel alone has endeavoured to 

 elucidate. 



Towards the close of his Memoire, however, M. Andre 

 has thrown a new light upon this subject in describing 

 two species of Smicra {S. picta and S. Jiavescens), both 

 females, the abdomen of the former having the " 7e seg- 

 ment prolonge en forme de queue, son arceau ventral 

 {hypopygium de Sichel) 2>^"s lo^W l^^e Varceau dorsal " 

 (p. 342). In the second species no mention is made of 

 these terminal segments. Some clue is thus afforded to 

 the signification attached to this suppositious " 7e seg- 

 ment " by its component parts, as aforesaid the latter 

 and shorter of which, in succession to the 6th segment, 

 being obviously the ainccd portion of the true hypopygium 

 (Sichel) ; while the former, plus long, can be no other 

 than the terminal portion of the projecting terebral 



