1912} Homologies in the Wing-veins of May-flies 105 
REFERENCES. 
Comstock, J. H. 1888. An Introduction to Entomology. Ithaca, N. Y., pp. 
1-234, figs. 
Comstock, J. H., and Kellogg, V. L. 1895. The Venation of the Wings of Insects. 
pp. 75-91, in Elements of Insect Anatomy. Ithaca, N. Y., pp. 1-91, figs. 
Comstock, J. H., and Needham, J. G. 1898-99. The Wings of Insects. Amer. Nat. 
Chap. IV. The Venation of the Wings of Ephemerida, pp. 117-126. 5 figs. 
Eaton, A. E. 1883. Revisional Monograph of Recent Ephemeride. Transact. of 
the Linnean Soc. London. Transact. (2), 3. 
Kellogg, V. L. 1895. The Ephemeride and Venation Nomenclature. Psyche, 
Vol. 7, pp. 311-315. 3 figs. 
Needham, J. G. 1903. A Geneologic Study of Teeeteae Wing Wenation: Pro- 
ceed. U. S. Nat. Mus. Vol. XXVI, pp. 703-764. Pls. XXXI-LIV. 
Redtenbacher, J. 1886. Vergleichende Studien uber das Flugelgeader der Insecten. 
Annalen des k. k. naturhistorischen Hofmuseums. Bd. 1, Heft 3, s. 153-231, 
t. [IX-XX. Wien. 
EXPLANATION OF PLATES. 
PLATE V. 
(In the wing-pads continuous lines represent tracheae and tracheoles; dotted lines represent developing 
veins.) 
Fig. 1. Wing-pad of Chirotonetes albomanicatus. Needham. 
toy 2. Wiprot bs 
“8. Wing-pad of Heptagenia sp.? 
aS Wane ot 
“5. Wing-pad of Heptagenia sp. (nymph No. 3 Needham). 
“6. Wing of 
& 7... Wing-pad of Epeorus humeralis Morgan. 
“<8. Wing of 
“9. Wing-pad of Tron fragilis Morgan. 
lO Wiiesob 
“11. Wing-pad of Ameletus ludens Needham. 
“12. Wing of 
“138. Wing-pad of Hexagenia Sp. ? 
“ 14. Wing of 
PiateE VI: 
Fig. 15. Wing-pad of Polymitareys albus Say. 
“ 16. Wing of 
eee Ais Wee pad of Ephemera sp. 
“18. Wing of 
“19. Wing-pad of Caenis diminuta Walker. 
“ 20. Wing of 
ae he eRe pad of Ephemerella rotunda Morgan. 
22. Wane ob 
“ 23. Wing-pad of Leptophlebia sp? 
noize.) Wang OF 
“ 25. Wing-pad of Choroterpes sp? 
“ 26. - Wing of 
“ 27. Wing-pad of Blasturus cupidus Say. 
~ 28. Wing of 
