April, ’18] 
COCKERELL: COLORADO MOSQUITOES 
199 
land; var. mediolineata comes from the dry mesa three miles north of Ten 
Sleep. On the dry mesa near Ten Sleep the catch was 6 curriei mediolineata 
and one vexans, but in the creek bottom 7 vexans only. A. curriei goes to 
about 8,000 feet in dry localities, as at Florissant, but is absent from the 
Canadian zone. 
(10) Aedes idahoensis Theob. Our form, referred to idahoensis by Dr. Dyar, has " 
the abdomen banded, and looks distinct from the more typical form, with 
square black patches on abdomen, collected by Dyar in Montana. As we 
have neither males nor larvae of the Colorado insect, the determination may be 
subject to revision. The localities are: three miles south west of Salida; one 
mile south west of Aspen; creek between Gypsum and Glenwood Springs (a 
small specimen); Upper Twin Lake; six miles above Wolcott; 3 or 4 miles 
above Carbondale; McCoy; two miles above Minturn. Several specimens 
from different places were examined by Dr. Dyar, and the others seem to me to 
be identical. I had first regarded the species as A. hirsuteron, which is very 
close to idahoensis, but the wing scales are not all black. In Colorado, ido- 
hoensis is of the Transition and Canadian zones. 
(11) Aedes mimesis Dyar. 1 had regarded this as a new species; Dr. Dyar refers 
it to mimesis, described from Montana and British Columbia in Ins. Ins. 
Mens., 1917, p. 116. It comes from Upper Twin Lake, and four miles above 
Red Cliff (alt. 8,850 ft.); it is therefore a species of the higher mountains. 
There is a broad median brown band on thorax, in curriei style. The mark¬ 
ings of the abdomen are variable. 
(12) Aedes nigromaculis Ludlow. A species of the plains; recorded from Akron and 
Boulder. In Wyoming Henderson and Schwabe took it at Basin. 
(13) Aedes pullatus Coquillett. A male which I collected at Estes Park Village 
(6,810 ft.), June 24, has been kindly examined by Dr. Dyar and found to be 
genuine pullatus. 
(14) Aedes sansoni Dyar & Knab. I had determined this as vittatus Theob.; 
Dr. Dyar states that it is sansoni, and in Ins. Ins. Mens., 1917, p. 115, shows 
that sansoni and vittatus are the same. The name vittatus was published first, 
but it had earlier been used by Bigot for an insect which (as I learn from Dr. 
Dyar) Mr. F. W. Edwards now treats as a valid species of Aedes. A. sansoni 
is common in the Transition and Canadian Zones of Colorado: Boulder; S. 
Cottonwood Canon near Buena Vista; two miles south of Leadville Junction; 
Crystal River near Red Stone (here also a small variety which looks distinct); 
three miles southwest of Salida; Upper Twin Lake. Prof. J. Henderson took 
it at 9,200 ft., southwest of Rabbit Ears, North Park, Colo., July 14, 1911, 
along with an Aedes with black tarsi and very long proboscis, not at present 
determined. A female which I collected at Estes Park Village, June 24, is 
said by Dr. Dyar to be near to or identical with sansoni. 
(15) Aedes stimulans Walker. Recorded from Florissant, 1907 (Cockerell & 
Rohwer, on an old determination of Dr. Dyar’s, when sansoni was not dis¬ 
tinguished. It was presumably sansoni. I have, however, a very close relative 
of stimulans in a female from two miles above Minturn (P. Andrews). It is 
remarkable for the large palpi, and is certainly not sansoni. Dr. Dyar says 
it is new to him, but it is not described, as we have neither male nor larva. 
(16) Aedes triseriatus Say var. hendersoni n. var. 9 . Dorsum of thorax anteriorly 
with at least lateral thirds covered with silvery scales; abdomen strongly pur¬ 
ple, with the lateral white marks cuneiform, pointed mesad. 2 9 . Box Elder 
Creek, 19 miles west of Douglas, Wyo., August 25, 1917 (Schwabe and Hen- 
