OF ARTS AND SCIENCES. 173 



2. Wiiiijs very larjje, i"eacliin<j a lensfth of nine centimetres ; externo- 

 median vein beginning to fork far beyond the middle of the wing ; 

 branches of internomedian vein superior to upper fork. 



P. superba, n. sp. Mazou Creek, 111. (L. M. Umbach). 



2. Wings much smaller than the preceding, not exceeding four centi- 



metres in length ; externoraedian vein beginning to fork before the 

 middle of the wing ; brandies of internomedian vein terminal. 

 P. Lacoana, n. sp. Near Pittston, Penn. (R. D. Lacoe, No. 

 2015). 



3. Upper branch of internomedian vein several times forked, com- 



mencing scarcely beyond the basal externomedian fork ; anal 

 branches more ramose next mars;in than in the followiiiif 



species P. vetusta Smith. Paoli, Indiana. 



3. Upper branch of internomedian vein forking only once, at a long 

 distance from the basal externomedian fork ; anal branches com- 

 paratively simple. Length 5.5 mm. . , . P. Gurleyl, n. sp. 



Orange Co., Indiana (W. Gurley). 



Besides these, Brongniart mentions and names several species from 

 Commentry, but without any exact indication of their relationship or 

 any characterization. Facts concerning them will, doubtless, soon be 

 forthcoming, as it is understood that he is engaged on the entire 

 carboniferous insect fauna of Commentry. 



Since presenting the above paper, Mr. Brongniart has kindly sent 

 me drawings of the wings of his Diet. Monyi and Diet. Goldenhergi, 

 the former an enormous wing about three decimetres long. They 

 both fall in one genus, in the vicinity of Goldenbergia, but must be 

 separated from that on account of the vast number of nervules, and 

 tlie completely simple internomedian vein. 



