372 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XV. 



All figures are three-fourths natural size, a, lateral view; b, dorsal view. 



Fig. L Plagiola lineolata (Rafinesque). Half -grown male from the Ohio River, 

 Cook's Ferry, Beaver Co., Pennsylvania, collected September 10, 1908; C. M. Cat. No. 

 61.3565. 



Fig. 2. Plagiola lineolata (Rafinesque). Adult gravid female from the Ohio River, 

 Cook's Ferry, Beaver Co., Pennsylvania, collected September 12, 1908; C. M. Cat. 

 No. 61.3565. 



Fig. 3. Plagiola lineolata (Rafinesque). Half-grown gravid female from the Ohio 

 River, Cook's Ferry, Beaver Co., Pennsylvania, collected September 10, 1908; C. M. 

 Cat. No. 61.3565. 



Fig. 4. Paraptera fragilis (Rafinesque). Male of Ohio-form from the Ohio River, 

 Industry, Beaver Co., Pennsylvania, collected September 23, 1908; C. M. Cat. No. 

 61.3549. 



Fig. 5. Paraptera fragilis (Rafinesque). Male of Lake Erie-form from Lake Erie, 

 Presque Isle Bay, Erie, Erie Co., Pennsylvania, collected July 12, 1910; C. M. Cat. 

 No. 61.4807. 



Fig. 6. Paraptera fragilis (Rafinesque). Female of Lake Erie-form from Lake 

 Erie, Presque Isle Bay, Erie, Erie Co., Pennsylvania, collected July 12, 1910; C. M. 

 Cat. No. 61.4807. 



Fig. 7. Proptera alata (Say). Male of Ohio-form, about half-grown, from Ohio 

 River, Industry, Beaver Co., Pennsylvania, collected August 30, 1909; C. M. Cat. No. 

 61.4108. 



