250 
NORTH AMERICAN MYRMOSIDAE 
^Iassachusetts; oods Hole, common, (A. L. Melander). New Aork; 
Rochester Junction, June 19, 30, July 11, 1914, 4 cf, (AI. D. Leonard), [Cornell 
University]; Ithaca, August 6, 1885, 1 o’, (E. H. Sargent), [Cornell Univer- 
sity]; June 24, 1900, 1 cf, [Cornell University]; August, 1916, 1 9, (the 
author), [Cornell University]; AIcLean, Cortland County, August, 1916, (the 
author), [Cornell University]; Rhinebeck, July 27, 1907, 1 o’, (C. R. Crosby), 
[Cornell University]. Pennsylvania. Virginia: Falls Church, June 27, 30, 
July 4, 5, 14, 20, 21, 28, September 4, 12 o’, August 2, 4, 11, 17, September 
7, 5 9 , (X. Banks), [N. Banks and Cornell University]; Glencarlyn, July 11, 26, 
3 o’, (X. Banks), [X. Banks]; High Island, June 23, 1 o’, (X. Banks), [X. 
Banks]; Great Falls, June 25, 3 o’, (X. Banks), [X. Banks]. Illinois: Lake 
County, common, (A. L. Melander). “ Xorthwest Territory” (Say). Fox 
states Canada and Virginia westward to Colorado. 
This is evidently a species essentially of the Carolinian Fauna. 
Where it extends into the Transition, as at Ithaca, it is of very 
rare occurrence. Rochester Junction, in New York State, where 
it is more common, is a region distinctly more Carolinian in its 
tendencies. 
Myrmosa (^Myrmosa) banks! new species, 9 . 
9 . Mahogany red, the abdomen except tip of first segment reddish black, 
legs a trifle more pallid, head a httle darker; clothed with only minute and 
sparse pubescence. Length, 3.2 mm.; paratypes, 3.4 mm. 
Head much romided, narrowed behind the eyes, ver\’ sparsely and minuteh' 
punctulate; oceUi minute, about .02 mm. in diameter, the posterior pair .15 
mm. from each other and .28 mm. from the eyes; face with a prominent spine 
between the antennae; border of clypeus not margined. First segment of the 
flagellum as broad as long, equal to the pedicel and shorter than the second seg- 
ment. 
Thorax with its sides contracted well toward the caudal end, but not strongly; 
the dorsum finely rugulose; lateral pieces of pronotum striolate; pleura 
impunctate and polished; caudal aspect of propodeum smooth and polished. 
Petiole smooth and pofished, toward its apex with two transverse, sinuous 
ridges, beyond which it is minutely punctulate, ventrally it bears a short thin 
keel, which is truncate in front and behind and notched beneath; second and 
following segments minutely and very sparsely punctulate, polished; pygidium 
with setigerous punctulations at its base. 
The paratypes generally have the head a trifle less finely punc- 
tulate, but sparsely so; the thora-x and first abdominal segment 
sometimes Sanford’s brown. Two specimens from Pennsylvania, 
presumably of this species, differ in being considerably larger, 
about 5 mm. in length, and with the head rather coarsely punc- 
tured, in one of them both closely and coarsel}" punctured. 
