NO. 1411. AMERICA}^ PALEOZOIC IXHEVTS—UANDLIR^rll. 7()1 



Sciidder took tho hind wing-s for the front ones, and referred the 

 form to the liomothetids (Paheodietyoptera Neuropteroidea); Bi-auer 

 fonnd aftinitv with the sialids, and only Brongniart recognized the rehi- 

 tionship with the orthopteres in a (strict sense. 



llolotype.—C^i. No. ;iS135, ILS.N.M. 



PROGENENTOMUM, new genus. 



Closely allied to the genus (Tenentornnni. The front wing is sonie- 

 wliat more pointed, its anterior margin slightly arched; subcosta 

 reduced; radius simple, its sector emerging- far above the middle, with 

 4 in part furcate anterior branches. Media with (?) 5 nearly parallel 

 principal offshoots, the first of which comes in contact with the radial 

 sector at one point. Cubital and anal parts not preser>'ed. C^ross 

 veins almost straight, rather regular and numerous, but not very 

 strongly imprinted. 



PROGENENTOMUM CARBONIS, new species. 



Locality. — Mazon Creek, near Morris, Illinois; Fennsylvanian; 

 Kittaiming ( (Allegheny) stage. 



Fig. 28. — Progenentomxtm carbonis. 



A piece, 35 mm. long, of a wing whose length was about 50 nun. 

 Daniels collection. Reverse of holotj'pe in the U. S. National Museum: 

 Cat. No. 35580. 



Family GKRARID.F, new family. 



In tills family 1 place a series of larg^er American forms, which in 

 the main are not sufficiently well preserved to be accurately described, 

 yet permit it to l)e clearly seen that they belong to the protorthop- 

 teres. The bodies of these insects are not Avell preserved, neverthe- 

 less they appear to haAe been rather slender and the prothorax seems 

 compressed, with margins, borders, or processes perhaps similar to 

 those which we find in man}^ recent Orthoj^tera. Unfortunately, in 

 all the fossils of this group at hand the front and hind wings lie over 

 one another — that is, are folded over the abdomen, so that the deciph- 

 ei'ing of the neuration is attended with considerable difficult3^ 



It is possible that this family may coincide with the oedischiids when 

 better preserv^ed examples become known. 



