1863.] 
199 
The % 9 subimago differ from vittigera in the same two characters 
as the 9 imago. In % the coloring is unusually bright, but the setae 
are pilose and the wings fringed under the lens. Both % 9 differ 
from 9 subimago of vittigera in the wings being whitish-opaque, in¬ 
stead of yellowish-opaque.—Length % 19 mill. 9 22 mill. Exp. % 32 
mill. 9 41 mill. Seta S 15 mill. 9 17 mill. Interm, seta % 3 mill. 9 
14 mill. One % , one 9 . 
Note 17, p. 175. P. BTLINEATA Say, and P. limbata Pictet. 
Nothing is easier than to distinguish living specimens of these insects 
by the color of the eyes. In the former the upper half of the eyes is 
cinnamon-brown, in the latter bright greenish yellow; in both the 
lower half of the eyes is black. The dried specimens, especially those 
of S ^ are very difl&cult to distinguish. I incline to believe that both 
the abnormal % from Rock Island, the 3 % from Chicago, the % from 
Red River (Uhler), and the h habitat unknown, are all properly refer¬ 
able to limhata and not to hilineata. In the middle of July, when on 
the shallow arm of the Mississippi, known as “ the Slough ” at Rock 
Island, hilineata appears in prodigious swarms, so that the bushes ab¬ 
solutely bend down with their weight, I examined many hundred % S , 
but could not find a single one with the setae other than dusky-brown 
to the naked eye, although under the lens there is occasionally a very 
small whitish annulus, as is noticed in Dr. Hagen’s description, at the 
base of the joints. The 9 9 5 on the contrary, almost universally had 
the setae very pale brown, verging on white towards the tip and darker 
at base, with conspicuous dark brown incisures, which were scarcely 
ever absent. In no one instance could I perceive an individual % with 
the setae as they are described by Dr. Hagen in the 3 % from Chi¬ 
cago, and as they are in % P. limbata, viz., brown with the basal half 
of the joints pale. Neither could I see a single individual S or 9 with 
the tips of the hind wings hyaline, as they are said to be in the abnor¬ 
mal % from Rock Island, and in the S without habitat. Lastly, I am 
sure that in the thousands of individuals both % and 9 which black¬ 
ened the bushes, there was not one with the upper surface of the eyes 
yellow or yellowish; the only variation I noticed from the normal 
color was, that one % had the eyes a shade or two paler than the rest 
on their upper surface. I have now before me in the dried specimen 
13 S 189 of hilineata, and 5 S 3 9 of limhata, and the following Table 
