MORPHOLOGY OF THE OVIPOSITOR 



171 



of the male correspond to those of the female, and arise from four 

 imaginal buds situated on the under side of the tenth abdominal 

 segment. 



In the ants, according to Dewitz, the genital armature is derived 

 from imaginal buds situated on the under side of the seventh, eighth, 

 and ninth abdominal segments. Bugnion has observed the forma- 

 tion of six imaginal buds of the genital armature in the larva of a 

 chalcid (Encyrtus, Figs. 41, 42, 191, q l <f<f), the transformation of the 

 central part of these 

 structures into small 

 digitiform pads, then 

 the division of the two 

 intermediate buds into 

 four (?) (Fig. 191, B,q*), 

 but was unable to trace 



Q 



their 

 ment. 



farther develop- 



FIG. 190. 1, sting and poison sac of the honey-bee : GD, 



The subject still needs 

 farther investigation, since 

 certain observers, as Haase, 

 and, more recently, Hey- 

 mons, do not believe that 

 they are homologues of the 

 legs, but integumental struct- 

 ures, though of somewhat 

 higher value than the style 

 of the base of the legs of 

 Scolopendrella and Thysa- 

 nura ; but it is to be ob- 

 served that as yet we know 



but little of the embryologi- poison gland; Gb, poison reservoir; D, accessory gland ; sti, 



pal hktorv of thpsp stvlp sheathing style or sting-" feeler "; Sir, sting; Ba, sheath; 



Styles. ^ quadrate plate; O, oblong piece; W, angular piece; , 



Those authors Who have baseof thestingandstylets;<S76',S%",thetwobarbed stylets 

 pyaminpri thp plpmpntss of or darts - 2, sting seen from the ventral face ; lettering as in 

 1 the other figure. After Kraepelin, from Perrier. 



the ovipositor, and regard 



them as homologues (homodynamous) of the limbs, are Weismann (1866), 



Ganin (1869), Packard (1871), Ouljanin (1872), Kraepelin, Kowalevsky (1873), 



Dewitz (1875), Huxley (1877), Cholodkowsky, Bugnion (1891), and Wheeler 



(1892). 



As shown, then, by our observations and those of Dewitz (Figs. 189 

 and 192), the rudiments of the ovipositor consist of three pairs of 

 tubercles, arising, as Kraepelin and also Bugnion (Fig. 191) have 

 shown, from three pairs of imaginal discs, situated respectively on 

 the seventh, eighth, and ninth uromeres, or at least on the three 

 penultimate segments of the abdomen. With the growth of the 



