34 Annals Entomological Society of America [Vol. XV, 



sac of the Tettigonoidea, by the inward prolongation of the 

 endoparanieres, but having also a strong resemblance to the 

 spermatophore sac of the Gr^dlidae. It opens into the ejacu- 

 latory duct, which is also dilated ventrally at the junction. 

 The sac and ventral dilatation appear to represent a vestigial 

 spermatophore sac (sps) and are here considered as such. 

 The wing-like expansions of the endoparanieres have essentially 

 the same relation to the spermatophore sac as in the Gryllidae, 

 especially in such genera as Nemohius and Oecanthus. Thc}^ 

 extend far beyond the end of the sac, however, the latter 

 being of comparatively small size and doubtless quite 

 functionless. 



The distal parts of the penis, including the rami, rest in the 

 concavity of a single large lobe, which may be called the 

 subventral lobe. It is separated from the floor of the genital 

 cavity by a flattened space, the siihgenital sac, which extends 

 far forward beneath the penis. 



The plan of structure just described for Dissosteira was 

 found to be essentially the same in various species of Acridinae, 

 Oedipodinas and Locustinse and is doubtless general throughout 

 the family."^ 



The variations in details of form, however, particularly of 

 the pseudosternite and the parts surrounding the outlet of 

 the penis, are numerous and often striking, even within the 

 limits of a genus, and in certain genera, such as Melanopliis, 

 they would afford useful taxonomic characters if they could 

 be more readily seen in dried specimens. 



The pseudosternite bears two pairs of ventral apophyses, 

 to which muscles from the ninth tergum and sternum are 

 attached and is elevated into a variety of prominences, cristate, 

 spinous or tuberculate (ppst), according to the species. In 

 Melanopliis there is a pair of anterior dorsal crests, which vary 

 in size in diff'erent species, being, e. g., moderately high in M. 

 bivittatus Say (Figs. 55, 56) and extremely high in M. femnr- 

 rubrum DeGeer. 



In this genus the ectoparameres are free (Fig. 57} and 

 are enclosed by the ventral lobes, which are not valve-like as in 

 Dissosteira, but broad and collar-like, surrounding the outlet 

 of the penis. They are flexible, but little chitinized, and are 



* This excludes the Acrydiinae, which are here considered as a distinct family, 

 Acrydiidae. 



