1863.] 
1^07 
Ephemera. 
Note 20, p. 178. E. myops n. sp. 
The % of this species differs from E. flaveoki Walsh, only in the fol¬ 
lowing respects :—The size is much larger, the expanse of the smallest 
myops being 7 millimetres greater than that of the largest flaveola^ of 
which 15 specimens have been measured by me; yet the eyes are not 
only relatively but absolutely smaller, and are separated by a space 2i 
times their own diameter instead of only by one diameter. The lateral 
abdominal fuscous vitta found in Jlaveola is absent, which however 
occurs also in two specimens of Jlaveola. In the more mature speci¬ 
men both venter and abdomen are ferruginous from 1 to 5, 6 and 9 
paler, 7 and 8 yellowish; in the other specimen the whole abdomen is 
yellowish, and I think it was so with both in the living insect.—Length S 
12—13 mill. Exp. S 26—27 mill. SetaS 27—29 mill. Interm. setaS 
19—21 mill. Ant. leg S 11 mill. TwoS ; 9 unknown. OneS was bred 
from the subimago, and the subimaginal integument having been pre¬ 
served shews the three setae to have been exactly equal and 16 mill, 
long. But for the eyes, which give this insect the appearance of a 9 
Baetisca, I should have supposed it to be a mere variety of Jlaveola. 
Cloe. 
Note 21, p. 178. C. viciNA Walsh, non Hagen. Say gives the 
length of C. posticata as 7^ or 8 mill., and the setae 18 or 19 mill., de¬ 
scribing only the % imago. Of 7 S imagos of C. vicina Walsh, mea¬ 
sured by me—and I had noticed many more in the field which did not 
appear any larger—the length was 4—5 mill, and the seta 74—10 
mill. Is not this rather too great a discrepancy to allow us to consider 
the two species identical ? Vicina being preoccupied, I should pro¬ 
pose for my species, if it be really new, the name oVpropinqua. 
OBONATA. 
N. B. The following drawing of the hind wing of Gomphns, copied 
with a few additions from the original of Dr. Hagen, (Mon. Gromph. PL 
22,) is intended to illustrate the pterological nomenclature of Odonata. 
With the exception of the anal angle (2;), and the anal triangle ( T’ ). 
the same parts with the same names occur slightly modified in the/7^onr 
wing of Gomphus, and generally in both wings throughout Odonata, 
