28 Afinals E7itomologicaJ Society of America [Vol. XV, 



tinctly chitinized at the margin, though it is apparently the 

 part which in the adult becomes wholly membranous and bent 

 inwards. The small, inner parts are less chitinized and are 

 readily recognizable also in the adult. 



In Neoconocephahis ensiger Harr., Sciidderia curvicaiida 

 DeGeer and other species of Scudderia the parameres have no 

 projecting spines. In S. curvicauda they are reduced to a 

 pair of rounded tubercles on the floor of the paramere sac, 

 densely beset with spinules. They represent a highly specialized 

 type. 



Grylloidea. The crickets are most remarkable for the 

 complex structure of the spermatophore and its sac. As an 

 example of the family we may first take the common field 

 cricket, Gryllus assimilis Fabr. The adult genitalia of this 

 species are show^n in Figs. 37-39. 



The pseudosternite is readily recognized from its general 

 resemblance to that of Ccuthophilus. As in this genus it is 

 a hood-like structure overarching the penis, but it is much 

 more closely connected with the latter than in Ceuthophilus, 

 forming what is virtually its chitinized dorsal surface. It 

 terminates in three prongs (pc) which doubtless serve as the 

 titillators and is connected laterally with the slender rami, 

 which pass ventro-cephalad to the floor of the genital cavity. 

 These are not produced into endapophyses. The ventral lobes 

 are large flexible whitish flaps, enclosing a concavity in which 

 the ampulla of the spermatophore rests after it has passed out 

 of the spermatophore sac. The latter is a deep rounded pocket, 

 whose roof and floor are formed of a single strip of thin chitin, 

 bent around the end of the sac and projecting over its mouth 

 in a pair of slender spines (vs), placed closely together. When 

 the spermatophore is in place the filament is curved upwards 

 around the end of the sac, and backwards along the middle of 

 the upper surface, its lateral expansions covering the floor, and 

 serving to anchor it. A narrow median groove in the roof, 

 terminating between the two projecting spines, is the site where 

 the duct is formed. 



Upon the roof of the spermatophore sac and beneath the 

 pseudosternite are two arcuate bars, meeting one another in 

 the middle line and continuous laterally with a pair of bars, 

 which appear on the inner surface of the sac near its mouth. 

 These curved bars are formed as evaginations of the roof of 



