﻿U S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 102 PLATE 7 



1, 2. Two spirals in legless part of abdomen of Apus longicaudatus, cf , from Kansas (Stock- 

 holm Mus.), dorsal and ventral views, X 4 (this specimen was examined and described as 

 Apus lucasanus by Packard). 



3-6. Eyes and nuchal organs of, respectively, Lepidurus lynchi, new species, cf , X 7; L. 

 lynchi echinatus, new variety, 9 , X 6; Z,, couesii, d", X 9; and L packardi, 9 , X 12. 



