THE CANADIAN ENTOMOLOGIST '•< 



a larger number of small segments; the cerci are flattened and 



distally tapering. 



In the Mantidse, the eyes are larger and much more prominent, 

 the antennae setaceous, the front legs raptatorial and the front 

 femora nea r ly always spinose along the outer edge; the prothorax 

 is usually elongated and the cerci are much shorter than the hind 

 femora. 



In the Phasmidae the prothorax is smaller than the mesothorax, 

 the meso- and metathorax are both greatly elongated, the coxa' 

 small and short, pulvilli are present and the cerci are unsegmented 

 and shorter than the hind femora. 



From the families of saltatorial Orthoptera the Grylloblattida* 

 differ in the generalized structure of the hind legs, the five-jointed 

 tarsi and the jointed cerci. 



Gryllobatta is thus seen to combine characters possessed by 

 several different Orthopterous families, but to be amply distinct 

 from all of them. On the whole, it appears to be most nearly 

 related to the Blattidae, though the general form of the body is 

 most like that of the Forficulidae. It resembles the Blattidae very 

 closely in the form of the head, the depressed body and cursorial 

 legs, but the form of the body is less specialized and the peculiarities 

 of the blattid leg, such as the greatly enlarged and closely approxi- 

 mated coxa 1 with the correlated reduction of the sternal plates, 

 though present in Grylloblatta, are much less marked than in the 

 cockroaches. The scattered tibial spines and five-jointed tarsi 

 are also characters that are common to both families. The simple 

 antenniform cerci recall those of Campodea, and are probably of a 

 more primitive type than the short flattened cerci of the Blattids. 



The position of the base of the antennae close to the front o- 

 clypeal margin is another primitive character in which Gryllo- 

 blatta resembles the Plecoptera. 



On the other hand, Grylloblatta appears to be more specialized 

 than the Blattids in the absence of styli and the presence of the 

 Tettigonid type of ovipositor. Apart from these latter features 

 this genus is distinctly more primitive than any of the other 

 families of Orthoptera, as far as external features are concerned. 



Of the three families of saltatorial Orthoptera, Grylloblatta is 

 most like the Gryllidae in the depressed form of the body and shape 



