1934 ] 
A New American Myrmosid 
57 
A NEW AMERICAN MYRMOSID (HYMENOPTERA : 
MYRMOSIDiE) 
By Neal A. Weber 
Harvard University. 
The following new species in a small genus of Scoloioid 
wasps allied to the Mutillidse is here described in order to 
use the name in a revision, now in progress, of the ant genus 
Myrmica Latreille. My thanks are due Professor C. T. 
Brues and Mr. Richard Dow of Harvard University for 
their opinions concerning its taxonomic status. 
Myrmosa dakotensis n. sp. 
Female: Length 3.6 mm. 
Color of head blackish brown with a mahogany red trans- 
verse band across the base of the mandibles and extending 
to a level with about the anterior % of the eyes ; of thorax 
mahogany red with a blackish brown anterior margin on 
the second segment, extending over the dorsal surface and 
down to about the middle of the sides, pronotum paler than 
the second segment; of first abdominal segment and mar- 
gins of second, mahogany red, other sutures and pygidium 
duller brown; of appendages mahogany red, heavily in- 
fuscated on the apical antennal segments and on the dorsal 
surfaces of the femora and tibiae. 
Hairs moderately abundant, mostly subappressed and 
short, except on the abdomen, where longer; joints of flagel- 
lum densely and finely pubescent, sparsely and inconspicu- 
ously so elsewhere. Posterior metatarsi with long and dis- 
tinct spines. 
Surface of body sfiining; head densely and coarsely, ab- 
domen less densely and more finely, punctate ; dorsal surface 
of thorax sharply and irregularly vermiculate, irregularly 
and sharply tuberculate on the propodeum; sides of prono- 
