34 Psyche [April-June 



Fig. 6. Lateral view of terminal structures of larval Trichop- 

 teron. 



Fig. 7. Frontal view of pupal head of Philopotamus only man- 

 dibles shown. 



Fig. 8, Dorsal view of thorax and wing bases of Mnemonica 

 auricyanea, Wals. 



Fig. 9. Frontal view of pupal head of Mnemonica auricyanea, 

 Wals. 



A COMPARISON OF THE GENITALIA OF MALE HY- 

 MENOPTERA, MECOPTERA, NEUROPTERA, DIP- 

 TERA,TRICHOPTERA, LEPIDOPTERA, HOMOPTERA, 

 AND STREPSIPTERA, WITH THOSE OF LOWER 

 INSECTS. 



By G. C. Crampton, Ph.D., 

 Massachusetts Agricultural College, Amherst, Mass. 



Since the same plates have been used to illustrate both the 

 present paper, and the preceding one dealing with a comparison 

 of the lower Lepidoptera with the Trichoptera, the same list of 

 abbreviations will serve for both papers, and by referring to the 

 explanation of the labeling, given on page 32, this will obviate 

 the necessity of repeating in the present paper, the list of abbre- 

 viations there given. For the Strepsipteron here described, I 

 am indebted to Dr. C. T, Brues. Dr. Bethune-Baker has loaned 

 me the lepidopterous material used; Dr. R. J. Tillyard has fur- 

 nished the neuropterous material; and Mr. S. A. Rohwer has 

 furnished the sawfly material used in the preparation of this 

 paper. Mr. Nathan Banks has very kindly identified the Trichop- 

 teron referred to, and Mr. A. N. Caudell has had the Homoptera 

 identified for me. To all of these gentlemen, I would express my 

 deep appreciation of their generosity and assistance so freely given. 



The genitalia of male insects have been discussed in several 

 recent articles; but the correct interpretation has not been given 

 to the parts in all cases. Recently, however, I have been able to 

 examine a far wider and more inclusive range of forms than was 

 at first available for study, and the added evidence, together with 

 that furnished in Dr. Walker's excellent account of the parts of the 



