48 Psyche [June 
most part, contented themselves with merely describing the parts, 
without comparing them with other insects, the homologies here 
proposed must be regarded as purely provisional, until more inter- 
mediate stages can be obtained in order to determine what paths 
of development have been followed in arriving at the different 
types of genitalia here represented, or until suitable material can 
be obtained for dissections which cannot be carried out with dried, 
borrowed material, or from single specimens, upon which I have 
been largely dependent! On this account, it is to be hoped that 
those who have specialized in these groups, and therefore have 
access to a wider range of forms and more favorable material, will 
carry out a more extensive study of the genitalia, in order to ar- 
rive at a definite conclusion concerning many of the points which 
a lack of suitable material has made it impossible to determine. 
It is quite generally conceded that the Sialid group should be 
rated among the most primitive representatives of the order 
Neuroptera.!. I have therefore selected Corydalis, Chauliodes and 
Neuronia (which are the most instructive representatives of the 
group, available to me) as the basis for a comparison with the 
higher forms here discussed. In these insects (Figs. 4, 10, and 
15), the digestive canal opens through an anal tubercle called the 
ee 
tuberculum, anoppilla, or proctiger “ap.” The two plates labeled 
“pa,” one on either side of the tubercle “ap,” were called par- 
aprocts in a previous discussion of the parts in Neuroptera (Cramp- 
ton, 1918), although I am not positive that they are the exact 
homologues of the paraprocts, or parapodial plates, of the Orth- 
optera and lower insects. In Corydalis (Fig. 15), the plate “pa”’ 
bears a pair of appendages “‘g,’’ usually referred to as the swperior 
and inferior appendages of the gonopods. For the sake of brevity 
they may be termed the surgonopod and subgonopod. 'The upper 
appendage, or surgonopod (Fig. 15) is the larger of the two, and 
appears to be the one to persist, when one of the two appendages 
is lost (as in Fig. 10, ete.). 
Klapalek, 1903 (Bull. Int. Acad. Sci. Bohéme), thinks that the 
gonopods of adult Trichoptera, etc. correspond to the “ Nach- 
schiebern” (anal prolegs?) of the larva. The gonopods of Neu- 
1 A study of the thoracic sclerites (which offer the most important characters for determining 
the relationships of insects) would indicate pba the Neuroptera form a homogeneous group, 
which should not be further divided into “‘ orders.’ 
