210 EXPLANATION OP PLATES, VOL. 28. 



EXPLANATION OF PLATES. 



Plate 1. 



figures page 



I, 2. Strohilops lahyrinthica {^ay) . Philadelphia 20 

 3, 4. Strobilops lahyrinthica Say). Type speci- 

 men 20 



5. Strobilops lahyrinthica ( Say ) . Kittery,York 



Co., Maine. 114775 20 



6. Strobilops labyrinthica (Say). Philadel- 



phia. 27281 20 



7. Strobilops labyrinthica (^Siy) . Ann Arbor, 



Mich. 122 20 



8,9. Strobilops labyrinthica {Say) . Silver Lake, 



Kansas. 64500 20 



10. Strobilops labyrinthica {Say) . Silver Lake, 



Kansas. 58319 20 



II. Strobilops labyrinthica {Say.) Dallas Lake, 



Wright Co., Minnesota. 67353 20 



Plate 2. 



1-4. Strobilops texasiana floridana Pils, Type 



and paratypes, Miami, Fla. 77044 26 



5-10. Strobilops texasiana P. & F. Type (figs. 7) 



and paratypes; near New Braunfels, 



Texas. 64498 24 



Figures 2, 6, 11, X 15 ; the others X 13. 



Plate 3. 



1-5. Strobilops affinis Pils. Upper Red Hook, 

 Dutchess Co., N. Y. 74414. Figs. 1, 2 

 the type 27 



6-11. Strobilops aenea Pils. Cazenovia, N. Y., 



90785. Figs. 7, 8 the type 29 



12. Strobilops aenea Pils. Brandywine Valley, 



Delaware. 85244 29 



1-5. Strobilops affinis Pils. Figs. 1, 2, the type ; 



fig. 5, base of young specimen 27 



6-11. Strobilops aenea Pils. Cazenovia, N. Y., 

 90785. Figs. 6, 7, the type; fig. 8, 9, 

 young specimens ; fig. 10, edge of parietal 

 lamella 29 



12. S. aenea. Brandywine Valley, Delaware. 



85244 29 



