234 
[October 
Note 22, p. 179.—Lestes eurina Say. There is a typical speci¬ 
men of this species in the Harrisian Cabinet at Boston. My friend 
Mr. Scudder has kindly furnished me with the following description 
of it:— 
Greenish blue; mouth yellow; labrum luteous ; top of the head and dorsum 
of thorax bright metallic blue with greenish and subviolaceous reflections, the 
dorsal and lateral sutures yellowish-brown, so as to show each a yellowish- 
brown inconspicuous line ; sides of the thorax metallic blue, the sides of 
the mesothorax with a biserrate yellow spot occupying its lower posterior third ; 
the side of the metathorax yellow with an oblique triangular fuscous stripe. 
Base of all the Ugs and under surface of the femora, especially of the posterior 
ones, yellow; upper surface of the femora, lower surface of the tibise and tarsi 
brownish green; upper surface of the tibiae fuscous. Wings subhyaline or 
slightly flavescent; pterostigma black. Abdomen above with segments 1—5 
blue, 6—10 blackish green; beneath pale fuscous, more dusky posteriorly, their 
apices blackish. Superior appendages forcipated, denticulate in the middle ex¬ 
ternally, beneath bidentate interiorly; the first tooth at the extremity of the 
basal fourth, sharply pointed and directed posteriorly, the second one just be¬ 
yond the middle, flattened, (depressed,) laminate, minutely denticulate, di¬ 
rected towards the corresponding tooth in the other appendage. Inferior ap¬ 
pendages removed. Postcubital cross-nervules 13 on one side, 15 on the other. 
Length to the base of the forceps 1 4-5 inch [46 mill.] Alar expanse inch 
[59-1- mill.] Pterostigma 1-10 inch [2^- mill.], surmounting 3—3^ cells, variable 
before and behind in either wing. One .” 
On comparing the above with Say’s description and with mine, I am 
fully satisfied of the identity of my insect with eurhia Say. There is 
considerable variation in the coloring, but not more than we often meet 
with in Agrionina. For example, I possess a % specimen of Afgrion Ram- 
burii, captured this year amongst a crowd of others, in which the 
‘‘narrow green lateral vitta” of the dorsum of the thorax is entirely 
obsolete in the middle and is represented at each end only by a green 
spot similar to the occipital spots. Again, in a host of species, e. g. in 
A(jr. aivile^ in Agr. apicale^ as observed by Say himself, and in the 
unnamed species described by me {III. Pseudoneur., p. 386) for which I 
now propose the name of Agr. IIagem\ what is sky-blue in the mature, 
is pale reddish-brown in the immature insect, both in the receut and 
in the dried specimen. Finally, in Agr. hinotatum Walsh, the fiorsunli 
of the thorax is “ pale reddish brown, reddish brown, or in the living ma¬ 
ture insect purple fading to reddish brown in death.” I have already 
stated that my specimen of eurina was “ somewhat immature,” and I have 
little doubt that what I described as “ fuscous ” in the dorsum of the tho- 
