Vol. XXviii] ENTOMOLOGICAL NEWS. 4O3 



In Grylloblatta and Embia the "eutrochantin" ahc (Figs. 9 

 and 6) is very similar, and is divided in the same fashion into 

 regions a, b and c, essentially the same in both insects, even to 

 the subdivision of the region a by an oblique suture, which, how- 

 ever, is not as distinct in Embia as in Grylloblatta. Furthermore, 

 the laterosternite v of Embia (Fig. 6) is represented in Gryllo- 

 blatta (Fig. 9) by a sclerite v of exactly the same nature, al- 

 though it is more closely connected with the sternum St in Gryl- 

 loblatta than in Embia. On the other hand, these sclerites in 

 both insects are very different from those of the Blattid's 

 (Fig. 2). 



In the neck region also there is a very close correspondence 

 in the cervical sclerites of the two insects. Thus, the region 

 designated as s in Grylloblatta (Fig. 9) is represented by a 

 region designated by the same letter in Embia (Fig. 6), and the 

 lateral cervical sclerite labeled i, with its partially detached por- 

 tion, labeled 0, is astonishingly similar in both insects, even to 

 the presence in plate i of a longitudinal suture (to which ex- 

 tends the broken line from the letter "i") which is present in 

 but few insects other than the Grylloblattids and Embiids. We 

 find no such agreement between the Grylloblattids and Blattids, 

 and the more features one examines in the insects in question, 

 the more it becomes apparent that the Grylloblattids have prac- 

 tically nothing in common with the Blattids, and practically 

 everything in common with the Embiids. The similarity be- 

 tween the Grylloblattids and the Embiids, (and the dissimilari- 

 ty between the Grylloblattids) extends to the other struc- 

 tures of the body as well, as will be discussed in a series of 

 papers dealing with these subjects, and these remarkable sim- 

 ilarities between the Grylloblattids and Embiids (with the re- 

 sulting dissimilarities between Grylloblattids and Blattids) must 

 be explained before one can claim that the Grylloblattid line of 

 development is to be traced back to Blattid-like rather than to 

 Embiid-like ancestors, (and through the Embiid-like ancestors, 

 to Plecoptera-like forebears). 



The contour of the head is quite similar in the Phasmid 

 Timema (Fig. 8) and Grylloblatta (Fig. 9), the character of the 



