694 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXIX. 



Order HAPALOPTEROIDEA, new order. 



This order i.s to be regarded as provisional, and, moreover, iiieludes 

 but one American fossil of which there is only one front wing- known, 

 and which permits itself at present to be ranked in no other order. 



The neuration of this wing may ])e easily traced to the paheodic- 

 tyopteran type, yet in the redaction of the cubitus and in the more 

 vaulted (instead of extending in a curve to the lower margin) anal 

 veins, it shows itself more highl}^ specialized. A separation of the 

 anal area has not yet been attained, and the wing appears to have 

 been of a very tender, delicate, membranous nature. As neither the 

 body nor the hind wing is present, I have not attempted to place this 

 interesting fossil in one of the other Paleozoic orders, although it is 

 always possible that it belongs in the protorthopteran group. It may 

 be, however, that in this specimen we must seek a forerunner of the 

 perlida^, the venation of which can quite easily be traced in that of 

 the present fossil. However, in any case, further discoveries must 

 be awaited before we can here render a iinal decision. 



HAPALOPTERA, ne>A^ genus. 

 HAPALOPTERA GRACILIS, new species. 



LocaUti/.--'6\\?iY\) Mountain Gap, near Tremont, Pennsylvania. 

 Anthracite series; stage undetermined. 



Length of wing, 15 mm. The greatest width amounts to scarcely 

 one-third the length and lies somewhat below the middle of the wing. 

 The tip is rounded oft' obliquely; the costal border is so slightly curved 

 as to ])e almost straight; the costal area is narrow. The sulicosta 



^ , fuses with the radius 



just above the tip of the 

 wing. Radius simple, 

 ' not far removed from 

 the subcosta. Radial 

 sector originating near 

 the base of the wing, 

 with 3 simple branches 

 extending obliquely to 

 the apical border. Media independent, not uniting with the radius; 

 it lirst sends oft* an oblique branch to the inner margin and then forms 

 a large long fork, whose branches continue obliquely to the lower end 

 of the apical border. The cubitus is restricted to a single long fork, 

 below which 2 distinctly vaulted, simple anal veins are then to be seen. 

 Midway thi-ough the medial group stretches a furrow, but the limits 

 of the anal area are not ftxed. The cross veins are not XQvy distinct, 

 but appear to have been rather regularly distributed. The wing joins 

 the thorax with a broad base. 

 JJoloti/j>e.—Cixt. No. 38731, U.S.N. :Vl. 



Fig. 22.— HAPALOPTERA GKACILIS. 



