NO. 1441. 



.1 MERia I N F. 1 LEOZO] < ' ]XSM;TS~-HA NDLIR8GH. 



789 



PTERIDOMYLACRIS PARADOXA, new species. 



Localiti/. — Ijorberiy Gap in Sharp Mountain, near Treraont, Penn- 

 sylvania. Anthracite series; stage ? 



Fig. 9V. — I'TKKlDUMVr.ACRIS I'AKADOXA. 



Length of the front wing', about IS mm. 

 Jlofofijpr.-^C'^t. ^o. :387;«, U.S.N..AI. 



Family IDIOMYLACRID.E, ne«- family. 



For the type of this family, I take a highly specialized blattoid 

 wing, which in the shape of the costal area agrees wnth the mylacrid 

 series, hut which appears to be distinguished by the unique disposi- 

 tion of the anal veins. The front wing is subelliptical, scarcely twice 

 as long as broad, with strongly curved inner margin and gently curved 

 anterior border. Costal area one-half as long as the wing, subtrian- 

 gular, broad; humeral angle rounded. The branches of the siibcosta 

 arise at the base of the wing. Radius di\ided near the base into 2 

 main offshoots, each of which forms al)out 8 branchlets. The twigs 

 of the superior branch end on the anterior liorder; those of the inf(»- 

 rior, on the contrary, on the apical margin. The media likewise sep- 

 arates into 2 branches similar to those of the radius, the twigs of 

 which (always 8) take up the last third of the inner margin. The 

 culdtus with its 8 branches is limited to th(» middle portion of the pos- 

 terior margin. The anal area occupies not much more than one-third 

 the length of the wing, and is detined by a strong!}- curved suture. 

 The anal veins are quite uniquel}- grouped, since from one stem 8 off- 

 shoots branch forward and 1 backward. The tirst branch ends in 

 the second, the second in the third, and this, as well as those follow- 

 ing, end in the inner margin. Structure finely stippled, like leather. 



