NO. 1441. . 1 MERICAN PA LEOZOIC INSECTS— IIANDLIRSCH. 721 



Radius forked .somewhat above the middle of the wing, the superior 

 branch with about 3 or 4 twigs, the inferior strongly vaulted, with 

 about ♦i twigs, all of which are oriented toward the front margin. 

 The branches of the strongly arcuate media issue posteriorly and turn 

 ill part to the apical border, in part to the inner margin, so that for 

 the 4 to 5 branches of the cubitus but little more than the middle third 

 of the margin remains. The anal area occupies about two-tifths of the 

 length of the wing and is marked off by a strongly curved fold; it con- 

 tains about 6 veins. Pronotum somewhat less than twice as broad as 

 long and nearly semicircular in form. The intercalary venation is not 

 known. 



Type of genus, Adelohlntta cohiinh'unKi (Scudder). 



ADELOBLATTA COLUMBIANA (Scudder). 



rm</<nt.ohlaUinaco/iuiihiaii.a^i:vi)i>Kii, Bull. U. S. (Teol. Surv., No. Ili4, IHtlfi, p. I'M, 

 pi. XI, fig. 9. 



Locality. — Mazon Creek, near Morris, Illinois. Penn.sylvanian; 

 Kittanning ''. (Allegheny) stage. 



? ADELOBLATTA GORHAMI (Scudder). 



Etohlatthia gorhatni Scudder, Bull. U. 8. Geo). Surv., No. 101. 1S!)3, p. 16, pi. 

 II, fig. a; No. 124, 1895, p. 80, pi. v, fig. 8. 



Locality. — Pawtucket, Rhode Island. Pennsylvanian; Ten-mile se- 

 ries; ? Alleghen}' or Conemaugh stage. 



PLAGIOBLATTA, new genus. 



Front wing more than 2^ times as long as broad, nearly elliptical, 

 with strongly curved anterior margin and more slightlj' arcuate inner 

 border. Costal area not expanded at the base, extending about live- 

 eighths the length of the wing, with about 8 branches. Radius vaulted, 

 its superior principal branch separated into -i to 5 twigs, which end in 

 the anterior border, besides 4 to «! mostly compound branches generally 

 oriented toward the apical margin. Media proc(?eding obliquely back- 

 ward and divided into 2, always 3 to 4 parted forks, whose branches in 

 part fuse in the inner margin, so that the 5 to (> offshoots of the cubitus 

 take up not more than the middle third of thi» posterior l)order. The 

 anal area reaches about two-hfths the length of the wing. The inter- 

 calary venation consists of distinct regular cross veins. The prothorax 

 (preserved in one species) is almost transversely elliptical, and about 

 one-fourth l)roader than long. 



Type of genus, I*J(i<jiohlatto jxiiuillcla (Scudder). 



