242 
CHLOROPERLIDAE 
Hastaperla Ricker 
Hastaperla brevis (Banks) 
Krison 19354, 1p. 431 
present paper, p. 340 
Alloperla Banks 
Alloperla caudata Frison 
Present paper, p. 342 
Alloperla banksi Frison 
Present paper, p. 343 
ISOPERLIDAE 
Isoperla Banks 
Isoperla bilineata (Say) 
Frison 1935a, p. 437 
Isoperla confusa Frison 
Frison 1935a, p. 441 
Isoperla conspicua Frison 
Frison 1935a, p. 445 
Isoperla decepta Frison 
Frison 19354, p. 447 
Isoperla minuta (Banks) 
Frison 1935a, p. 453 
Isoperla mohri Frison 
Frison 1935a, p. 455 
Tsoperla richardsoni Frison 
Frison 1935a, p. 459 
Isoperla marlynia Needham & Claassen 
Frison 1935a, p. 439 (clio), and present 
Papert, ep-.050 
Isoperla burksi Frison 
Present paper, p. 332 
Isoperla longiseta Banks 
Present paper, p. 318 
(cydippe), and 
PTERONARCIDAE 
Because of their large size for stoneflies, 
gill remnants on adults and general dis- 
tribution, the species of Pteronarcys have 
long attracted the fancy of students of 
insect life. In spite of all the work done 
to date, however, there remain taxonomic 
problems and gaps in our knowledge which 
can be solved only, or best, by the rearing 
of series of specimens from numerous lo- 
calities. 
One of the problems confronting the 
writer has been the determination of the 
number of eastern North American spe- 
cies in the complex in which the nymphs 
lack the lateral lobes or hooks on the sides 
of the abdomen. This, in turn, has led to 
some discoveries regarding existing nomen- 
clatorial matters. My conclusions to date 
regarding these matters are presented 
under the headings of Pteronarcys dorsa- 
ta (Say) and picteti Hagen. 
The bibliography and synonymy listed 
for dorsata and pictetii do not include all 
references to these two species in litera- 
ture, but these listings do account for all 
references involving synonymy and nomen- 
Intinois Naturat History SurRvEY BULLETIN 
V ol.-22, Arie 
clatorial problems. It is a fairly safe as- 
sumption that all American references 
since Smith (1917) for dorsata should 
now be associated with dorsata and those 
for nobilis Hagen should now be associated 
with pictetit. 
Pteronarcys dorsata (Say) 
Sialis dorsata Say (1823, p. 164). Original 
description. 
Pteronarcys regalis Newman 
176). Previous synonymy accepted. 
Kollaria insignis Pictet (1841, p. 123). 
Previous synonymy accepted. 
Pteronarcys nobilis Hagen (1861, p. 15). 
New synonymy. 
Pteronarcys proteus Hagen (1861, p. 14). 
Is 
ir 
(18384, p. 
New synonymy. 
Pteronarcys regalis Hagen (1873, p. 286 
Previous synonymy accepted. 
Pteronarcys nobilis Hagen (1873, p. 285 
New synonymy. 
Pteronarcys frigida Gerstaecker (1873, p. 
65). Previous synonymy accepted. 
Pteronarcys rectus Provancher 
189). Previous synonymy accepted. 
Pteronarcys flavicornis Provancher (1876, 
p. 191). Previous synonymy accepted. 
Pteronarcys nobilis Klapalek (1907, p. 153). 
New synonymy. 
Pteronarcys dorsata Needham & Claassen 
(19252 p93 Oe 
Pteronarcys shelfordi Frison (1934, p. 25). 
Bert synonymy of frigida by Ricker (1938, 
p. : 
In her revisional paper dealing with the 
North American species of Pteronarcinae 
and Perlodini, Smith (1917) established 
the association of the specific name of 
dorsata with a common northeastern spe- 
cies of Pteronarcys which in the female 
has the posterior margin of the eighth 
abdominal sternite straight and in the male 
has the tips of the lobes of the tenth ab- 
dominal tergite bent upward. This con- 
cept of dorsata may or may not represent 
the species actually described by Say, but 
this interpretation of Say’s species was ac- 
cepted by Needham & Claassen (1925) ; 
there is no good reason for not following, 
and from the standpoint of stability of 
names there is good reason for favoring, 
the perpetuation of this earlier nomen- 
clatorial decision. 
It is unfortunate, however, that, when 
adopting the use of the name dorsatd, 
Smith (1917) did not correctly interpret 
nobilis Hagen (1861). The female of 
nobilis in the original description is char- 
acterized as having the “2 antepenulti- 
mate one [ventral segment] truncated, 
orange, two short setiform appendages! 
(1876, p. 
