124 Annals Entomological Society of America [Vol. XI, 



b. Orthoptera. — In regard to the Orthoptera it may be said 

 that they are of course here, as elsewhere in structure, a very 

 generalized group. To begin with, the tables show the presence 

 of eleven, or at least parts of ten, somites and all four pairs of 

 appendages in all the forms studied. This is particularly 

 remarkable in connection with Appendage II, the commonly 

 called "mesal," or "median" pair of appendages, which are so 

 many times entirely lacking in the female. 



In no case is the latter pair so prominent in the above men- 

 tioned genera as in Mantis. However, in case of every mod- 

 ification of the genitalia, whether it be for the purpose of digging 

 in the ground, as is true in the grasshopper and the cricket, or 

 whether for holding the spermatophore, the habit of the female 

 Xiphidium, it is possible easily, not only to work out and see 

 plainly this appendage, Appendage II, but also to see that it 

 follows immediately upon Appendage I in an extreme ventro- 

 caudal position. 



Table of Sclerites and Appendages. 



SOMITES appendages 



Periplaneta orientalis 7, 8, 9, 10, 11 I, 11, III, IV. 



Female t+ t+ t+ t+ t+ + + + + 



s4-+s+ s-f s-j- s+ 



Male t+ t+ t+ t+ t+ +. + + + 



s-i- s-j- s-(- s-j- s-|- 

 Melanoplus differentialis 



Female X+ t-|- t-|- t-F t-h + + + -h 



s-j- s-j- s-j- s-j- s-j- 



Male t-h t-h t-H t-h t-h + + + + 



s-h s-f s-f- s-l- s-l- 

 Dissosteira Carolina 



Female i+ t-|- t+ t+ t-f + + + + 



s-h s-j- s-j- s-j- s-j- 



Male t+ t+ t+ t+ t+ + + + + 



s-\- s-f- s-f- s-|- s-f 

 Xiphidium 



Female t-f- t-f- t-f- t-f t-f- -f -f- -f -f- 



s-f s-f s-f s-f s-f 



Male t-f t-f t-f t-f t-f -f -f -f -f 



s-f s-f s-f s-f s-f 

 Grylhis 



Female t-f t-f t-f t-f t-f -f + -f -f 



s-f s-f s-f s-f s-f 



Male t+ t-f t-f t-f t-f -f + -f -f 



s-f s+ s+ s-f s+ 



