NO. 1411. A MERICA N PA LEOZOIC INSECTS— HA NDLIRSCH. 751 



(ARCHIMYLACRID/E) EVERSA (Scudder). 



GcrabluUina eversn Scitddkr, Bull. U. S. (leol. Surv., No. 124, 1S95, p. 122, pi. x, 

 fig- 14. 

 Locality. — Cassville, West Virginia. Dunkard formation; Lower 

 Permian. 



Is most probably a species of Phylohlafta. 

 IIolotijpe.-Q.^t. No. 38066, U.S.N.M. 



(ARCHIMYLACRIDiE) CORIACEA (Sellards). 



Etohlatt ina coriacea ^KhLARDs, Amer. Jour. Sci. (4), XVllI, 1904, p. 218, tijr. 29, 

 pi. I, fig. 11. 



Locality. — Lawrence, Kansas. Upper Coal Measures; Le Koy 

 (Lawrence) shales. 



Family SPILOBLATTlNIDyE, new family. 



In this family I unite a series of forms from the upper part of the 

 Upper Carboniferous and from the Permian formation of Europe and 

 America. These forms permit themselves to be readily derived from 

 the archimylacrids, from which they differ only in a character of rela 

 tively limited morphological importance. In the central portion of the 

 front wing- the interspaces between the main veins are remarkably 

 broad, and it seems as though the wing membrane in this place must 

 have been very delicate, for on the impression along the veins there 

 is always a thicker edge, in which remnants of cross veins are to be 

 seen; these, however, do not extend over the entire interval, so that 

 in all large interspaces fenestrate, empty patches occur. 



The costal area is always band shaped, of various lengths, and the 

 branches of the subcosta successively arise in a pectinate manner. 

 The radius separates either in 2 widely compound main ])ranches or it 

 sends out forward a larger number of feebly compound offshoots. 

 The media only rarely divides into 2 equally branched principal stems, 

 but mainly forms a series of branches running out forward; posteri- 

 orly the branches run out in a single fold. The cubitus is formed 

 like that in the archimylacrids, as well as the anal area, the veins of 

 which always end in the inner margin. 



SYSCIOPHLEBIA, new genus. 



Front wing subreniform, with strongly arcuate front margin and 

 slightly ourved inner border, about 2^ times as long as wide, with 

 more or less broadly rounded apical edge. Costal area reaching at 

 least one-half and rarel}" more than two-thirds the length of the wing. 

 The branches of the media always run off' forward and are directed 

 toward the apical margin. The 1)ranches of the radius take up the 

 entire anterior margin; those of the cubitus the entire posterior bor- 

 der. Anal area marked off' by a strongly curved fold. 

 Proc. N. M. vol. xxix — 05 52 



