PLATE XL 



HEBRUS AND RHAGOVELIA. 



Fig. 1. Adult female Hehms concinnus. 



Fig. 2. Antennae of Hebrns to show the five segmented condition plus 

 the small segments. 



Fig. 3. First Instar nymph of Hebrus. 



Fig. 4. Fore and hind wings of Hehrus. 



Fig 5. Female Rhagovelia obesa. 



Figs. 6 and 7. Tarsus of middle leg to show the cleft condition with 

 its tuft of fringed hairs. These spread beneath the surface of the 

 water, as in 7, and aid in rowing over rapid water. 



Fig. 8. One of the fringed hairs enlarged. (6, 7 and 8 from Bueno.) 



Fig. 9. Male Rhagovelia obesa. 



(288) 



