40 Psyche [April-June 



and 7, probably represent the eighth tergite, and the structure 

 labeled "ep" bears the anus at its tip (i. e. it is a "proctiger"). 

 The proctiger "ep" probably represents the tenth tergite united 

 with the ninth, although the embryology of these insects would 

 have to be studied in order to definitely determine what segments 

 enter into the composition of the structures in question. The 

 structure labeled "g" is here interpreted as representing the 

 united basal segments of the gonopods (labeled "g" in other 

 figures — as in Fig. 21 for example) though it may also include the 

 ventral plate "ha" of other insects as well. The forceps "h" 

 of Fig. 14 apparently represent the distal segments of the gonopods 

 *'h" of other figures. All that remains of the phallus or sedeagus, 

 is the slender bowed structure "pv, " which bears a terminal 

 articulated appendage or " telsedeagus " fitting into the groove on 

 the lower (posterior) surface of the proctiger "ep." In the 

 fulgorid shown in Fig. 16, the structure bearing the label "8?" 

 probably contains the ninth segment; but it appears to be the 

 eighth. The dorsal structure labeled "ep" is apparently formed 

 in great part by the ninth tergite which has probably united with 

 the tenth tergite, and has grown downward and posteriorly below 

 the anal opening. The structure "ep" is thus a "proctiger" 

 rather than an "epiproct," though either term might be applied 

 to it. The forceps "s" of Fig. 16 represent either the styli (gon- 

 opods) of other figures (labeled "s") or they represent portions 

 of these styli (gonopods); and the inner structures "pv" which 

 they enclose, are probably homologous with the penis valves 

 *'pv" of other insects. It is quite possible that the structure 

 "ep" of Fig. 16 may represent a union of the structures labeled 

 "sg" and "ep" in Fig. 20; but I have been unable to determine 

 this point. 



The tergal region" "ep" of the Trichopteron shown in Fig. 15 

 probably represents the ninth, or the united ninth and tenth 

 tergites, while the lateral lobes "sg," are apparently homologous 

 with the copulatory lobes "sg" of Figs. 20 and 21. The structure 

 labeled "pv" in Fig. 15 is the sedeagus or phallus, and is possibly 

 composed of the united penis valves of certain other forms. The 

 gonopods "s" of Fig. 15 are two-segmented (t. e. are made up of 

 segments "g" and "h") and are apparently homologous or 

 homodynamous with the styli "s" (also composed of two segments 



