128 
Psyche 
[December 
the coxites and styli of such primitive insects as Machilis, 
etc., despite the fact that the forcilate genitalia of male 
Hymenoptera (and Coleoptera) are clearly homologous with 
the forcipate genitalia of male Mecoptera, Diptera, Trichop- 
tera, etc., and if the forcipate genitalia of male Hymenoptera 
and Coleoptera represent parameres, then the forcipate geni- 
talia of all Holometabola represent parameres throughout 
the series of closely related insects. 
There are marked sexual differences in the shape and 
structure of the vestigial wings of the two sexes of Boreus. 
As is shown in the accompanying figure, the wings of the 
male are slender curved tapering structures, and the front 
wings of the male are lined along both the anterior and pos- 
terior borders by a row of stout bristles to aid in holding the 
female in copula. The wings of the female, on the other 
hand, are flat lobe-like structures, having no apparent func- 
tional significance. 
