ARCHIMYLACRIS (SCHIZOBLATTA) OBOVATA. Ill 



There is no trace of the anal portion of the wing, or of the remainder of the 

 cubitus. 



The wing is thick, coriaceous in texture, and convex dorsally. The whole 

 surface is covered by a dense series of irregular oblique wrinkles. In some places 

 a close-set series starts out from the sides of a vein, and dies out in the interspace. 

 In other places sets of wrinkles are interrupted by smooth interspaces, this 

 arrangement occurring at haphazard. There are a few cases in which the 

 wrinkles unite. 



Affinities. — There can be no doubt as to this specimen representing an 

 Archimylacrid. Dr. Handlirsch, who makes Archimylacris the type of a family, 

 Archimylacridce (' Proc. U.S. National Museum,' vol. xxix, p. 722, 1906), has also 

 founded a new genus, Schizoblatta, and with the type-species of this genus the 

 specimen here described is in close agreement. 



The points to which I attach importance are the following : In both, the 

 subcostal area extends for a short distance beyond the middle line, the veins in 

 each case passing out obliquely to the margin. A very wide interval separates the 

 stem of the subcosta from that of the radius in the middle of their length, and this 

 area is narrowed distally in each case by the approach of the marginal veins. 

 The radius is a large and much branched vein, and separates into two main 

 divisions, which fork at the same level and reach the apical point of the wing — - 

 in this specimen just beyond it. The median is relatively small, while the 

 cubitus has few branches, passing obliquely out, like those of the subcosta, to the 

 margin . 



The anal area in the type, Schizoblatta alutacea, is long, attaining nearly half 

 the length of the wing. In the specimen here described this part is missing, as is 

 also a part of the cubitus. The missing portion of the inner margin extends 

 beyond the middle of its length, and knowing how frequently the anal vein 

 determines the line of fracture, this extended broken area becomes significant. 



Dr. Handlirsch's definition of the genus Schizoblatta is as follows: "Front wing 

 elliptical, about two and two-fifth times as long as broad. Costal area extending 

 about three-fifths the length of the wing, with about nine or ten normal veins; not 

 expanded at the base. Radius divided into two principal stems, the superior of 

 which separates into six branches and the inferior into eight, the majority of the 

 latter ending in the apical border. The median likewise divides into two main 

 stems, the anterior of which forms five branches, and the posterior four, all of which 

 fuse in the apical margin. The eight branches of the gently vaulted cubitus take 

 up the entire inner border. The anal area attains nearly half the length of the 

 wino-. Cross-veins area not to be distinguished, but instead there is a fine-o-i-ained 

 leathery structure " (loc. cit.). 



If the genus is to be maintained apart from that of Archimylacris, I would base 

 the characters on the obliquity of the marginal veins of the subcosta and cubitus, 



