PLATE V. 



HlSTIOSTOMA PYEIFOKME, page 221. 



Length (without rostrum), 2 about '3 mm., $ about 



25 mm. 



Fig. 1. Adult ? seen from above, X 130. 



2. Adult $ seen from below, X 130. 



3. Adult ? seen from below, X 130, lately 



emerged specimen. 



4. Adult ? seen from above, covered with Vorti- 



cellas, as sometimes found. 



5. Nymph, about half grown, X 250. 



