Doe 
The types of pacifica are in the collec- 
tion of the Museum of Comparative Zo- 
ology and bear the type number “11,304” 
and the locality of ‘Pullman, Washing- 
ton.” In the typic series are three speci- 
mens, one male and two females. Through 
the kindness of Dr. Nathan Banks I was 
permitted to relax and study closely in 
fluid the genitalic characteristics of one 
male, and I herewith designate this male 
specimen as the lectotype. 
The holotype, allotype and paratypes ot 
kincaidi were sent to me for study through 
the kindness of Professor Trevor Kincaid 
of the University of Washington, and the 
holotype and allotype of raynoria were 
studied through the courtesy of Professor 
J. Chester Bradley of Cornell University. 
I synonymized raynoria and kincaidi 
with pacifica in my most recent stonefly 
paper (1942) because of my belief that 
all observable differences fall within the 
limits of specific variation and involve no 
marked differences in kind of structures. 
The differences observed included varia- 
tion in the size and shape of the rearward- 
pointing appendages on the tenth abdom- 
inal tergite and the lobes protruding up- 
ward from the bases of the cerci, as well 
as differences in pigmentation of the ab- 
dominal segments. It may be that some of 
these differences predominate in certain 
geographical areas, and such names as 
raynoria and kincaidi can be used in the 
future for geographical races or subspecies. 
For instance, the rearward-pointing lobes 
on the tenth abdominal tergite of the type 
of raynoria, which comes from “Yosemite, 
California,” is larger than in many spect- 
mens I consider as pacifica in the Illinois 
Natural History Survey collection from 
Oregon, Washington and British Colum- 
bia. 
Claassen (19375) gave an illustration 
of the lateral view of the terminal abdom- 
inal segments of his raynoria, and better to 
show its similarity with pacifica I include 
here a dorsal view of the terminal abdom- 
inal segments of the holotypic male, fig. 
12, and a ventral view of the terminal ab- 
dominal segments of the allotypic female, 
fig. 12, which Claassen did not illustrate. 
Taeniopteryx kincaidi, from several lo- 
calities in Washington, was placed in the 
synonymy of pacifica (Frison 1942) for 
the same general reasons as just given in 
the case of raynoria. In her key involving 
Itttno1is NatuRAL History SURVEY BULLETIN 
V ol. 22, Art 
the separation of the species of Taeniop- 
teryx from Washington, Hoppe (1938) 
keys out pacifica from kincaidi on the 
basis of the presence of two raised rear- 
ward-pointing appendages on the tenth 
abdominal tergite of the male in pacifica 
and their lack in kincaidi. No good spe- 
cific characters for the separation of these 
aes ‘ 
Q ABDOMINAL STERNITES 
d' ABDOMINAL TERGITES 
Fig. 12.—Brachyptera pcaee 
two species are given in the original de- 
scription of kincaidi. An examination of 
the males in the typic series of kincaidi 
reveals the presence of these lobes exactly 
as in pacifica. ‘The statements in the key 
regarding ‘““Hind margin of the tenth ter- 
gite extended rearward” undoubtedly re- 
fer to the ninth tergite, and this particular 
structure seems to vary considerably in 
specimens of pacifica. 
Taeniopteryx pallida (Banks 1902), de- 
scribed from “Little Beaver, Colo., July 
18, 1898,” is yet another species which 
must be considered in the final synonymy 
of the pacifica complex. Although at the 
present time I cannot certainly separate 
the typic female of pallida from othe 
females of the pacifica complex, I have 
hesitated to sink this name in synonymy) 
because of lack of males associated witl 
females which may be considered as pal 
lida. There is a possibility that the mal 
when found might be distinct enough t 
warrant specific recognition. On the othe: 
hand if the male that goes with pallid: 
falls within the pacifica complex, then thi 
name pallida will be antedated only by 
pacifica. 
It has been most interesting to discove 
that pacifica is not restricted to the west 
ern states and that it occurs in cold rapi 
streams in the mountainous parts of Mary 
land, New Hampshire, New York, Nort! 
Carolina, Tennessee, Virginia, and m 
