134 THE CANADIAN ENTOMOLOGIST 



sac, comparable to the sheath of the eversible hook, which is present in the 

 same situation in many Blattidae, sometimes on the right side, sometimes on the 

 left. There is, however, no hook in Gryllohlatta on the left side, although the 

 toothed prominence on the right side is apparently its homologue. The pur- 

 pose of the coiled sac is not evident. It seems to be too far from the opening of 

 the ejaculatory duct to serve as an eversible seminal reservoir or a bursa copula- 

 trix, for although I was unable to detect the genital aperture it is extremely 

 probable that it lies in the fissure between the two lobes. 



The disto-medial angle of the left lobe is produced into a rounded process, 

 which fits into a fold of the right lobe. Its inner surface is somewhat grooved 

 and lies in the fissure, possibly functioning as a seminal channel. It much 

 resembles the "'penis" of Periplaneta, Blaberus and other Blattidae. 



Probable Copulatory Position. 

 In the absence of any actual knowledge of the copulatory position in 

 Grylloblatta it is perhaps of little value to speculate as to its nature, but the fol- 

 lowing suggestion may be of some use as a guide to future observations. 



It is probable that the copulatory position is radically different from that 

 of the Blattidae and Mantidae, in which, on account of the shortness of the 

 ovipositor, an end-to-end connection is possible. I have a female specimen of 

 Stagmomantis Carolina wdth a portion of the male body attached, and it shows 

 that the decurvcd dorso-caudal margin of the ovipositor is received within the 

 genital cavity of the male, the body of the latter being twisted so that its dorso- 

 ventral axis is perpendicular to that of the female. Such a position would be 

 impossible in an insect with so long an ovipositor as Grylloblatta, and it is, 

 therefore, extremely probable that the copulatory position is more nearly com- 

 parable to that which is usual in the Orthoptera and Phasmoidea, i.e., the 

 genitalia of the male are applied to the vulva of the female, the two sexes facing 

 the same direction. This is the more probable in that the genital aperture of 

 the female Grylloblatta opens directly on the ventral surface at the base of the 

 ovipositor, not being covered by a subgenital plate. 



The scoop-shaped left coxite seems adapted to receive the base of the 

 ovipositor, covering the vulva. This would place the right coxa on the right 

 side in such a position as to receive the lower edge of the right dorsal valve of 

 the ovipositor in the notch between its distal part and the chitinous spur (cxp) 

 on its upper edge, which, from its direction would be on its inner side (Fig. 15). 

 The inner edge of the right ventral valve would then be received between the 

 right coxite and the toothed process of the right lobe of the phallus, or possibly 

 between the latter and the transverse laminae (Im). This position would also 

 bring the oblique fissure more directly in line with the longitudinal axis of the 

 body of the female, and thus permit a more direct passage for the spermatic 

 fluid or spermatophore into the vagina. 



The Male Nymph. 

 The earlier of the two stages represented (stage A) measures 11 mm. in 

 length, the hind tibiae 2.75 mm. The antennae, one of which is incomplete, 

 have 22 segments. It is quite similar to the adult in form, except in the some- 

 what less tapering antennae, and slightly stouter femora, particularly the pro- 

 femora, which are nearly half as broad as long, and the terminal abdominal 

 segments and genitalia. 



