2l8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



Fig. 12. — Athoiis, Lepttiroides, Hemicrepidius, and Ludius. 



a, Athous ciicullatus (Say), urogomphi, dorsal view, b, Leptiiroides linearis 

 (Linnaeus), urogomphi, dorsal view, r, Athoiis iiiittilatits Rosenhauer, uro- 

 gomphi, dorsal view, d, Hemicrepidius sp., mediotergite of fourth abdominal 

 segment, lateral view, e, Ludius divaricatus (LeConte), ninth abdominal seg- 

 ment, dorsal view. /, Hemicrepidius )jiciiuionius (Herbst), ninth abdominal seg- 

 ment, dorsal view (drawn from a larval exuvium). 



