24 



Annals Entomological Society of America [Vol. XV, 



with the formation of the spermatophore, as it is absent in 

 the Acrididse and TridactyHdae, in which apparently no sperm- 

 atophores are formed. 



Tettigonoidea. With the exception of the aberrant Sten- 

 opelmatine Cyphoderris monstrosa Uhl., and probably other 

 Stenopelmatinae, in which the penis is degenerate, the male 

 genitalia of the Tettigonoidea, as represented by the forms 

 studied, may be divided into two types, the one represented 

 by the Rhaphidophorinae, the other by the Decticinas, Cono- 

 cephalin^e, Copiphorinas, Phaneropterinae, Tettigoniinae, Meco- 

 neminae and probably by most of the other subfamilies. 



Fig. 4. 



Fig. 4. Genitalia of male Orthoptera, dorsal views (diagrammatic); a, Tetti- 

 goniid, based on Ceuthophilus (parameres partly everted); b, Tettigoniid, 

 based on Nediiha; c, Gryllid, based on Gryllus; d, Acridid, based on Dissosteira. 

 For lettering, see page 71. 



The first type is the more primitive and may be illustrated 

 by the genus Ceuthophilus. Figs. 22-25 show various views of 

 the penis of C. lapidicola Burm. In this type the penis is almost 

 entirely membranous, as are also the parameres, which in 

 C. lapidicola are only slightly chitinized proximally along their 

 mesial surfaces, the narrow chitinized areas coalescing at base 

 to form a single sclerite. In the resting condition (Fig. 22) the 

 posterior wall of the penis is invaginated, forming the sperma- 

 tophore sac, into the lower part of which the ejaculatory duct 

 opens (gp). The upper part is marked off from the lower by a 

 slight transverse fold (fps), above which is seen the plate 

 formed by the united bases of the parameres (pmb), which 

 being partly inverted, are otherwise invisible in this position. 

 The fold (fps) corresponds to the floor of the "paramere sac" 

 in Neduba, etc. (see p. 27). In Fig. 25, of PI. Ill, which was 



