BULEE TIEN 
OF THE 
BROOKLYN ENTOMOLOGICAL SOCIETY “~~ 
VoL. XIII _ JUNE, 1918 No. 7 
A PHYLOGENETIC STUDY OF THE TERMINAL ABDOMINAL 
STRUCTURES AND GENITALIA OF MALE APTERY-— 
GOTA, EPHEMERIDS, ODONATA, PLECOPTERA, 
NEUROPTERA, ORTHOPTERA, AND 
THEIR ALLIES.* 
By G. C. Crampton, PH.D. 
The insects here discussed are the Protura, Sminthurids, Japy- 
gids, Machilids, Lepismids, Ephemerids, Neuroptera, Odonata, 
Plecoptera, Embiids, Dermaptera, Zoraptera, Isoptera, Blattids, 
Mantids, Phasmids, Orthoptera, and their immediate relatives. A 
’ more detailed description of the modifications of the genitalia oc- 
curring in these different groups will be taken up in subsequent 
articles dealing with the subject; so that the present paper is in- 
tended merely to serve as the basis of the later more detailed dis- 
cussion of the genitalia of these groups, and of the higher orders 
of insects. The present paper is also offered as one of a series of 
articles dealing with the structures which appear to be of the most 
value for a phylogenetic study of the orders of insects. The 
other papers of this phylogenetic series were published in the Can. 
Ent. for June, 1917; in the Nov., 1917, issue of the Ent. News; 
in the Dec. number of the Jour. N. Y. Ent. Society for 1917; in 
Psyche for February, 1918, and in the Proc. Ent. Soc. Washington 
for 1918. 
Since I have been dependent upon the generosity of others for 
practically all of the material studied in the preparation of the 
present paper, I would make use of this opportunity of acknowl- 
* Contribution from the Entomological Laboratory of the Massachusetts 
Agricultural College, Amherst, Mass. 
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