Che Canada Entomologist. 
Ol. V2 LONDON, ONT., MAY, 1373. No. 5 
HYPENA SCABRA (Fasr.) AND H. ERECTALIS, Guen. 
BY J. A. LINTNER, ALBANY, N. Y. 
In the examination of my last season’s collections of Æyfena scabra 
(scabralis, Guen.,) and “ & erectalis,” for sexual determinations, I was 
surprised to find of the former, only the male represented, and of the 
latter, only the female. Collections of each having been made during the 
same period of time (from September 1st to September 24th) and at the 
same place (the wall and ceiling of the piazza of my residence)—such a 
remarkable occurrence seemed to be so removed from accident, and 
inexplicable from any difference of sexual habits, that I was led to suspect 
the identity of the two species. On referring to my cabinet, I there 
found individuals labelled as ¢ and © of each species ; but, on a critical 
- review of these determinations by an infallible method of distinguishing 
sex in the Heterocera, viz., the structure of the frexzum (simple in the 
male and compound in the female), my “ 2 ” scabra proved to bea Z, 
and my “ Ÿ ? erectalis a 2. Among my duplicates of the collections of 
several years, the same result obtained. Mentioning these facts to my 
friend, Mr. Meske, of this city, he was quite positive of having in his 
cabinet the sexes of each species, but he subsequently found that a 
frenulum inspection of all his examples gave him only one sex of each 
form. There was, therefore, no longer room for doubt of the identity of 
the ‘two species ”—that “ crectalis” is only the femaie (though uniformly 
smaller) of scabra. 
It is interesting, in connection with the above, to notice that Guenee, 
in his description of scabralis, refers to seven fs under his observation, 
and says, “‘ Je ne connais pas la 2.” Of erectalis he says, “ 3 f,1 9.” 
Mr. Grote (Trans. Amer. Ent. Soc., iv, p. 102) cites f and © of erectalis 
