1918] Crampton—Genitalia of Male Neuroptera, ete. 47 
THE GENITALIA AND TERMINAL ABDOMINAL STRUC- 
TURES OF MALE NEUROPTERA AND MECOPTERA 
WITH NOTES ON THE PSOCIDAE, DIPTERA AND 
TRICHOPTERA.! 
By G. C. Crampton, Pa.D. 
Since the Neuroptera form one of the most important groups for 
a phylogenetic study of the higher insects, the discussion of the 
condition met with in them, and in the closely allied Mecoptera, is 
here offered as the basis of a later, more detailed consideration of 
the genitalia of the Trichoptera, Diptera, and other higher forms 
which can be more profitably taken up in separate articles, and 
are therefore only briefly referred to in the present paper. The 
homologies here proposed are based upon a more extensive con- 
sideration of the genitalia of the males of the lower insects, pub- 
lished in the June, 1918 issue of the Bulletin of the Brooklyn 
Entomological Society, and forms one of the series of phylogenetic 
studies there listed. 
Many of the accompanying rough sketches were made from 
material kindly loaned by Mr. Nathan Banks, to whom I am like- 
wise indebted for identifications of specimens, and for the loan of 
valuable literature dealing with the subject. Dr. R. J. Tillyard 
has also furnished me with a number of intensely interesting Neu- 
roptera for study, in addition to much valuable literature on 
Australian Neuroptera and Mecoptera. Since I have been 
largely dependent upon the generosity of others for material in 
carrying on the present investigation, I would make use of this 
opportunity of acknowledging my deep obligation and expressing 
my very sincere gratitude to Mr. Banks and Dr. Tillyard for their 
ready and generous response to a request for aid in furnishing ma- 
terial and literature for such a study. 
It is indeed surprising that so little has been published concern- 
ing the homologies of the genitalia of male Neuroptera and 
Mecoptera, which are of the utmost importance for the correct inter- 
pretation of the parts in the higher forms. Since those who have 
referred to the genitalia of the groups in question have, for the 
1 Contribution from the Entomological Laboratory of the Massachusetts Agricultural College, 
Amherst, Mass. 
