XXxii, '21] ENTOMOLOGICAL NEWS 99 



The Dermaptera, Embiida, Plecoptera, Haplopteroida, 

 Hadentomoida, etc., have been grouped into a superorder 

 called the Panplecoptera and, with the exception of some of 

 the Plecoptera and the Dermaptera, the member? of this order 

 have not inherited much of the tendency toward the great de- 

 velopment of the anal fan, which has passed into most of the 

 Orthopteroid insects and those related to the Isoptera, although 

 the Isoptera themselves were but slightly touched by it (only 

 such primitive Isoptera as Mastotcrmcs have a pronounced 

 anal fan), and their allies, the Zoraptera, escaped it wholly. 

 The Embiid members of the superorder Panplecoptera, lack 

 the anal fan, and exhibit certain oligoneurous tendencies in- 

 dicative of a close approach to the Zorapteron type, so that 

 these insects, rather than the Plecoptera (which are in other 

 respects much nearer the type ancestral to the Zoraptera), 

 furnish the best intermediate stages in tracing the wings of 

 the Zoraptera to the point of origin in the Palaeodictyopteroid 

 types, from which the Embiids, Plecoptera, Haplopteroida, 

 Hadentomoida, and allied ancestral forms, were derived. 



The Haplopteroid type of wing is very like that of certain 

 Plecoptera (although certain other Plecoptera are more like 

 some of the Palaeodictyoptera) , while the Hadentomoid type! 

 of wing, such as that shown in Plate II, Fig. 11, more nearly 

 represents the first stages in the origin of the Embiid types 

 (such as that shown in Eig. 9) from the Palaeodictyopteroid 

 ancestral stock. Thus, the anal vein A is quite similar in Figs. 

 11 and 9. and the character of the cros? veins between 

 Cu\ and Cn2 in Eig. 11, is very suggestive of that occurring 

 in the Embiid shown in Fig. 9. Vein M has only two branches 

 in Fig. 11. while the reduction is carried still further in Fig. 

 9, in which M is unbranched, and this tendency for M to 

 remain unbranched is carried over into the Zoraptera (Fig. 5) 

 also. In both insects shown in Figs. 11 and 9, R4 and R5 

 are distinct, while R2 and R3 have apparently united to form 

 R2+3, although I am not certain of the latter point in Fig. 

 11. Some of the cross veins arc -till retained in Fig. 9, but 

 in the other Embiid shown in Fig. 7 most of them have In- 

 come lost, and certain of the Ion-it udinal veins have become 



