. Annals of the Entomological Society of America. Entomology. 130 Annals Entomological Society of America [Vol. IX, Long duration of copulation, the absence of a spermatophore and the superposition of the body of the male during copulation divides the Phasmids and the Acrididse at once from the Locustidae and the Gryllidae. Minor peculiarities in these factors permit a division between the Acrididas and the Phasmids. The Locustidae and the Gryllidae have a short duration of cop- ulation, and a spermatophore which is usually visible. The Locustidae and the Gryllid^ may be divided upon the groun
. Annals of the Entomological Society of America. Entomology. 130 Annals Entomological Society of America [Vol. IX, Long duration of copulation, the absence of a spermatophore and the superposition of the body of the male during copulation divides the Phasmids and the Acrididse at once from the Locustidae and the Gryllidae. Minor peculiarities in these factors permit a division between the Acrididas and the Phasmids. The Locustidae and the Gryllidae have a short duration of cop- ulation, and a spermatophore which is usually visible. The Locustidae and the Gryllid^ may be divided upon the ground that there is a superposition of the body of the female in the Gryllidae and an "end to end" position of the bodies in the Locustidae. The mole crickets may be divided from the other Gryllidae because of their peculiar modification of the usual body position. GRYLLIDAE GRYLLOTALPIN^ ACRIDIDAE Af \ / \PHASMIDAE LOCUSTIDAE. Fig. 4. Classification based upon the development of spermatophores in- those forms showing an inclination toward this structure. Acrididas and Phas- midae, having sperm masses resembling spermatophores but not enclosed in a membrane, are placed at one extreme. Gryllidae have definite spermatophore, but highest development is reached in Locustidae, which are placed on the left extreme. An attempt is made in Figure 5 to summarize the factors that have been named as well as some additional ones. The main division is made because of the following facts: The Blattidae and the Mantidae have a definite egg capsule or ootheca; they have no development of an external ovipositor for inserting eggs into the ground or into twigs and they neither produce sounds nor have organs for the reception of sounds. The other groups are united because they possess ovipositors, because they have organs for producing and receiving sound and because they do not lay their eggs in a capsule. The posi- tion of the Phasmids is doubtful but a consideration of all their breeding
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