58 Bulletin of the Brooklyn Entomological Society Vol. XIII 
appendages have been homologized with abdominal limbs by some 
investigators, although their true homologies have not been defi- 
nitely determined. In such Mecoptera as the males of Merope 
tuber, there occur segmented structures which have been homolo- 
gized with these so-called gonopods of Corydalis and the other 
Neuroptera. Since true cerci have been described by Tillyard, 
I9I7, as occurring in the male of the Mecopteron Nannochorista 
in addition to the gonopods, these gonopods are evidently not the 
cerci. In certain Ephemerids (Fig. 9) there occur jointed styli, 
labeled “s,” which have been homologized with these gonopods of 
the Neuroptera and Mecoptera; but the styli “s” of Fig. 9 typ- 
ically occur on the ventral plate “hy” (which is homologous with 
the ventral plate “hy” of Fig. 100) so that the appendages of 
the plate labeled “pa” (7. e., the gonopodia) in Fig. 100, can 
hardly be homologized with appendages of plate “hy” of Fig. 
100, since one plate is dorsally located, and the other is ventral. 
On this account, I do not think that the styli of the Ephemerids 
(Fig. 9, “s”) are homologous with appendages of plate “pa” of 
Fig. 100, and they therefore are not to be homologized with the 
gonopods of Neuroptera. Plate “pa” of Fig. 100, however, 
appears to be homologous with the paraprocts of other insects 
(“pa” of other figures) and has been provisionally designated 
as the paraproct of the Neuroptera, in the present paper. 
The eleventh abdominal tergite “sa” of the Lepismid shown 
in Fig. 94 bears a median terminal filament or “ telofilum,” labeled 
“t,” which is retained in certain Ephemerids (Figs. 9 and 15, 
“t”) but appears to be wanting in most winged insects. The 
plate “sa” has been variously termed the supraanal plate, suranal 
plate, suranale, etc.; but has been here referred to as simply the 
epiproct or pygidium. In some Plecoptera such as those shown 
in Figs. 16, 18, etc., the epiproct “sa” bears a posterior horn-like 
projection labeled “pc.” In certain Odonata (Figs. 7 and 8) the 
segment preceding the epiproct bears a horn-like process, not 
strictly homologous with the structure designated by the label 
“pe” in Figs. 16, 18, etc., but it is unnecessary to apply different 
terms to the two structures, which are practically the same in their 
nature and position on the tergal region of the segment bearing 
them. 
