204 
[October 
“ set90 hardly longer than the body.” Yet the figures given in the 
Synopsis under B. ve.rticu Say, are 8 and 24 respectively. Now the 
setae of pulchella are 17—22 mill., and it can scarcely therefore be iden¬ 
tical with a species which, according to its describer, has setae only 8 mil¬ 
limetres long. If B. verticis Say, is ever identified, I should conceive, 
from the ornamentation of the legs and the description of the hind 
wings, that it will probably prove to be a Cloe. 
The following belong to the same group {Heptagenia n. g.) as P. 
pulchella Walsh. 
Heptagenia n. g. 
H. simplex, n. sp.— Golden-yellow ranging to whitish. Head with the eyes 
bright greenish yellow in the living insect above and below; orbits of ocelli 
blackish. Upper surface of thorax flesh-colored. Abdomen and venter perfectly 
hyaline and immaculate, except the last two or three joints, which are opaque 
yellowish or whitish; setae white, tinged with dusky at the extreme tip; anal 
appendages white. Legs white, the femora yellow or yellowish, and the ex¬ 
treme tips of all the tarsi and in the anterior legs the tips of the tibiae and some¬ 
times the tarsal incisures, fuscous. Wings hyaline, veins and cross-veins fine, 
subequal, the cross-veins on the terminal J of the costa coarse, on the other § 
very fine, and entirely absent, except the oblique basal vein, on the basal fifth 
of the costa; veins and cross-veins in both wings hyaline except on the terminal 
i or § of the front wing where they are fuscous, all the costal cross-veins being 
occasionally fuscous. 
The 9 differs from as follows:—The abdomen and venter are egg-yellow, 
except where the eggs have been extruded. The setse are scarcely tinged with 
dusky at tip. All six legs have only the extreme tip of the tarsus a little tinged 
with fuscous. All the veins and cross-veins are hyaline, except a few cross¬ 
veins towards the costal tip which are dusky, and the costal veins which have 
a yellowish tinge.—Length % 6—8 mill. 9 ^—8i mill. Exp.—20i mill. 
9 21—22i mill. Seta'^ 14—18^ mill. 9 I'i—mill. Ant. leg 6^ mill. 9 (same 
size) 6 mill. 
Ten % , nine 9 . 
The h 9 subimago difter only in the usual way from the imago. The 
wings, as well as their veins and cross-veins, are yellowish, all the veins 
and cross-veins, except on the costa of one 9 5 untinged with fuscous.-— 
Length h 6 mill. 9 6i—9 mill. Exp. % 16 mill. 9 19—25^ mill. Seta % 
10^ mill. 9 10—15 mill. One % , four 9 .—This species is remarkable 
for the unusual shortness of the anterior tarsus, which never exceeds j 
the length of the tibia in S , and i the tibia in 9 , whereas in ptcl- 
chella % it is generally from | to i longer than the tibia and in pul- 
chella 9 about as long as the tibia. It differs also from its congeners. 
