State Agricultural Society. 
895 
P0IRT8 OP DIPPBRBNCE BETWEEN THESE TWO 8PECIE8. 
same parts taking on the red color in each instance and thus indi¬ 
cating this coloring to be constant, it began to appear as though 
these were a third species instead of a connecting link between 
two remote varieties. I thereupon resolved to give this matter a 
thorough re-examination, to determine the true relations of these 
respective individuals to each other. During nearly a score of 
years another specimen of the Red-lined species has come to me, 
whereby I have three examples of it before me for comparison, 
and quite a number of the Yellow-lined species. I first remark 
that several of the latter are of a larger size than either of the 
former, and that each of the partly red examples are small, though 
some Yellow-lined males are equally small. And I next notice the 
important fact that the partly red examples are each one males, 
and those which are wholly red are females, and from my notes I 
learn that the red specimen in Dr. Harris’s collection is also a 
female. It thus appears that this remarkable difference in their 
colors is sexual. Mr. Say, however, states that the specimen from 
which he drew his description was a male. But I am constrained 
to suspect he was in an error. In females which are newly dis¬ 
closed from the pupa, and before the ovipositor has been pro¬ 
truded for use, the tip of the abdomen is small and undeveloped, 
whereby they at first glance appear to be males, and in such cases 
it is only on a close examination of good specimens that the sex 
can be accurately determined. Further observations will, I think, 
establish it as a fact that the Red-lined specimens are all females 
and those that are partly red are their males, as some other spe¬ 
cies of this family present equally remarkable differences in the 
colors of the two sexes. 
On coming next to particularly examine and compare the several 
specimens, I discover such differences in some of the details of their 
structure, their colors and also their habits, as conclusively show 
the yellow-lined ones to be a distinct species from those which are 
partly and wholly lined with red. Tho latter have the whole sur¬ 
face of their wing covers netted with veins and veiulets, whilst the 
former have them thus netted only at their tips, the longitudinal 
veins on the disk and base of the wing covers being unconnected by 
short transverse veinlets, save in the middle cell, which is crossed 
by three or four of these veinlets, the corresponding cell in the red- 
lined species always having a larger number than this. On the 
head of the yellow-lined species the two middle stripes aro parallel 
