Raymond. — Isotelus gigas Dekay. 



PLATE 3. 



Fig. 1. — Isotelus iowensis Owen. A large specimen from the Trenton at 

 Trenton Falls, N. Y. 7 mm. longer than natural size. No. 422, 

 M. C. Z., Walcott coll. 



Fig. 2. — The same species. A small specimen from the same locality as the 

 last, for comparison with fig. 3, and with fig. 6, Plate 2. No. 421, 

 M. C. Z., Walcott coll. 



Fig. 3. — Isotelus gigas Dekay. A small specimen showing all the character- 

 istics of the adult. For comparison with fig. 2. From the Tren- 

 ton at Trenton Falls, N. Y. No. 41, M. C. Z., Walcott coll. 



