An Odonate Nymph from a Thermal Spring. 



65 



and ends in a stout spine ; the superior laterals are shorter — 

 seen fro 11 above, they are spine-like, with spinous apex dis 

 curved ; the lower laterals are broad, with stout, decurved 

 apex ; margins convex with rows of brown setae. The wing- 

 covers reach the ninth abdominal ring. 



The smaller specimens are much lighter in color and meas- 

 ure 7 mm. in length ; the wing-covers are very rudimentary ; 

 There are no other notable differences. 



Figure 1 was drawn from the mature individual ; Figure 2 

 from the tip of the abdomen of a small one ; it shows the parts 

 flattened by the compressorium, and the lateral appendages, 

 more or less nearly from the side. 



The type specimens are preserved in the Museum of the Cincinnati 

 Society of Natural History, being entered in the Accession Catalogue 

 as Nos. 9315 and 9316.— J. L. 



3 



