1863.] 
179 
It is the smallest Ephemerinous species known. It belongs to Mr. 
Walsh’s section B “ four wings, cross-veins sparse.” 
C^NIS. 
C. HiLARis Say= AMIGA Hagen. I do not possess this species. It 
is in the Berlin Museum; and I have no other remarks to make on it 
than those in my description.—I received in 1860, from the upper 
Wisconsan Biver, through Mr. Uhler, a new species C. nigra mihi. 
ODONATA. 
Synopsis p. 65, 4th line from bottom, for two antecubital trans¬ 
verse nervules,” read “ Pterostigma regular.” 
Ibid. Line 2 from bottom, “ the 4th apical sector broken.” This 
4th sector is a very constant vein in all Odonata, and separates from the 
“principal sector” between the “nodal” and the pterostigma. M. 
Selys names it now the “ ultranodal sector.” M. Charpentier was the 
first to observe that the 4th sector is broken in Lestes, and after him 
authors have always employed this character. As the Synopsis of 
Lestes and Podagrion appeared last year, I note here what there is in 
it relating to North America. 
Lestes alacer : We have received the 9 • —stulta is very pro¬ 
bably L.forcipata. —L. vidua (and L. minuscula Uhler) are L. conge¬ 
ner. —L. tenuata : we have the 9 • In. the Synopsis of N. A. Neur. dele 
p. 69, last line, “ similar to L. forjicula.” —L. hamata (No. 12) is the 
true L.forcipata of Bambur; so M. Selys has named No. 13 (my L.for- 
cipatob) L. hamata. —Finally, we have described two new species, L. 
DISJUNCTA Me., Ill., Nova Scotia, Bed Biver, Saskatchawan, &c., and 
L. VIGIL AX New Jersey, Uhler, a species received before from the 
Vienna Museum. I am not yet sure but it is synonymous with L. 
insequalis Walsh; at all events it must be closely allied, especially the 
abdominal appendages. — Lestes Eurina Say, Walsh, I do not know. 
\_See note 22.]—There are altogether in our Synopsis 50 species of 
Lestes. In the Synopsis of Podagrion there is nothing new in refe¬ 
rence to North America. 
I have read with much interest Mr. Walsh’s exposition, p. 381—3. 
It is a veritable progress, and I entirely approve of his ideas. In 
general M. Selys and myself have used Bambur’s nomenclature, with 
