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 
My r mica 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 shining; 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- 
