164 
Psyche 
[December 
Megachile dakotensis n. sp. 
c? . Face up to level of anterior ocellus densely clothed with 
whitish pubescence, directed downward on the clypeus, upward 
on the supraclypeal plate, and outward on the inner orbits, 
thinner but entirely pale on the vertex and upper cheeks, longer 
and pure white on the cheeks below; clypeus closely and dis- 
tinctly punctate apex entire; mandibles reddish apically, 3- 
dentate, middle tooth the smallest, the inferior tooth submedian, 
slightly nearer the base, punctures sparse apically, fine and close 
basally; cheeks shining, rather closely punctate, inferior angle 
simple (not grooved or toothed); vertex rather closely and 
deeply punctate, but shining between the punctures; lateral 
ocelli nearer to adjacent eyes than to edge of the vertex; antennae 
black, obscurely reddish below. 
Thorax with pubescence entirely pale, pure white below, 
rather loose and thin above; mesonotum closely punctate, tes- 
sellated between the punctures which are crowded anteriorly 
and laterally; scutellum more shining, with punctures somewhat 
finer; pleura with punctures contiguous; propodeum shining, 
very finely punctate, the punctures indistinct posteriorly, basal 
triangle impunctate, very finely tessellated; tegulae ferruginous, 
shining, with minute punctures; wings subhyaline, dusky api- 
cally, nervures piceous, second submarginal cell receiving the 
recurrent nervures at about equal distances from base and apex, 
transverse median slightly before basal nervure. 
Front coxae bare in front, black, shining, sparsely punctate, 
with short, flattened, triangularly pointed spines which are 
strongly divergent with respect to each other, no patch of red 
bristles, spines and coxae with long white pubescence posteriorly; 
front femora and tibiae black, inclined to reddish, white pubescent, 
the femora keeled beneath, red on the face anterior to this keel, 
finely punctate on the opposite face, smooth and shining above; 
outer face of tibiae rather coarsely punctate, black except apex, 
the two inner faces shining and reddish, apex of tibiae yellowish; 
spur similarly colored; tarsi simple, not to any degree hollowed 
out, but yellowish and with a prominent hair fringe behind, first 
joint slightly shorter than joints 2-4; four posterior legs black, 
but all the tibiae ferruginous apically, and the tarsi piceous, middle 
