JAMES A. G. REHN 
175 
jiroportionately narrower: eyes in basal outline, in lateral view, deeper and 
more elliptical, less sharj) ovoid ventrad. Pronotum with strangulation 
slightly less marked: caudal angle of disk less acute produced and subrec- 
tangulate. Tegmina surpassing apex of abdomen by approximately the 
dorsal length of i)ronotum, and surpassing apices of caudal femora by ap- 
I)roximateh" the combined length of head and pronotum, in shape more 
elongate with distal section moderately attenuate, ^^'ings more falcate 
attenuate distad (see figure 4), apex of axillary field much more obliquely 
arcuato-lobulate: jjosterior ulnar area broad, the ulnar vein moderately 
sigmoid and not subparallel to anal vein as in typical .4. c. cnrUnianus, ulnar 
area at three-fifths of length nearly twice as wide as adjacent portion ofmed- 
\tvn area: interaxillary area relatively narrow compared with ])ost-axillary 
area, narrowest point at two-thirds of wing length: radiate field of wing 
with margin more evidently sinuato-lobate. 
Allotype . — d' ; Same data as type. [Hebard Collection]. 
The female .sex shows the same characters of differentiation as the male 
sex, although to a slight^ less marked degree. 
The coloration of the species as a whole will be discussed at a later date 
in a study of this and related genera. Xo marked color features differenti- 
ate the new subspecies. The infuscate area j)resent on the proximal section 
of the wing in the majority of specimens of *4. catiinianus airliniaiiuH is 
rarely indicated in .4. c. .'itrepitun, but it is by no means a fixed feature in 
series of typical carlinianns and is not a diagnostic feature of that subsj)ecies. 
In car. carlinianm from Garrison, ^Montana, it may be evident or absent. 
In atyj)ical individuals of the same form from the Snake Kiver region, hlaho, 
it is almost always absent, and here conditions of aridity nearer akin to those 
prevalent in the area of distribution of .4. c. strcpitus may be the cause. At 
all events the presence or ab.sence of wing cloud infuscation is not a subspecific 
'eature in this species. In the series of slrepitus we find the wing cloud weakly 
indicated in one topot_ype and more evident in one female from Wells, Nevada, 
tendencies or evident clouds indicated in all or nearly all from Green Kiver, 
\\'yoming; Grand Junction, Colorado, and INIilford, Utah. This clouding is 
entirely independent of the pronounced pencilling of the radiate veins of 
the wing, which is found without exception in all s]jecimens of the species. 
Measurements {in millinieters) 
Ijength 
Ijcngtli 
Length 
Length 
of 
of 
of 
of 
car. carlinianus 
tiody 
I^roiiotiiin 
tegmcn 
caudal 
femur 
cf, Fort Collins, Colorado 
. . . 32 
7.3 
27. S 
14.(1 
cf. Fort Collins, Colorado 
31.. a 
S 
2S 
14. S 
cf. Garrison, Montana 
2.0 
(1.4 
24.4 
12.7 
o', Garrison, Montana 
29.3 
7 
2.')..') 
13.4 
9, Fort Collins, Colorado 
33. S 
7.S 
30 .0 
1.0 . 0 
9, Garrison, iMontana 
32.3 
7.4 
29 
ll.C) 
9, (iarrison, Montana 
TRAN.S. .\M. ENT. SOC., XLVII. 
34 
7 . T) 
27.9 
15 
