388 
[February 
gate, cylindric, convex above, finely and densely punctured, shining, 
black j apical segments very much incurved; the five basal segments 
with an apical fringe of whitish pubescence, more dense on the two 
first segments and narrow on the others; apical segment obtuse, ab¬ 
ruptly depressed above into a large deep fovea; ventral segments flat¬ 
tened, with several small obtuse projections; apical segment forcipate. 
Length lines. 
Rab. —Pike’s Peak, Colorado Territory. Two specimens. Coll. Ent. 
Hoc. Phila. 
2. M. obsoleta, n. sp. 
Male .—Head black, finely and densely punctured, sparsely clothed 
with pale hairs, which are more dense about the insertion of the an¬ 
tennae; clypeus flat, clothed with short decumbent silvery-white pile, 
its apical margin truncate; antennae black, the flagellum tinged with 
rufo-piceous towards the tip. Thorax black, finely and densely punc¬ 
tured, rather sparsely clothed with whitish hairs which are short in 
front and beneath, and long on the scutellum and metathorax, the lat¬ 
ter longitudinally impressed on the disk. Wings subhyaline, stained 
with fuscous towards the tip; nervures dark fuscous. Legs black, 
sparsely clothed with short pale hairs, which are long and white on the 
anterior femora beneath. Abdomen elongate, cylindric, convex above, 
finely punctured, shining, black; apical segments very much incurved; 
the apical margins of the second and three following segments with an 
obsolete fringe of pale pubescence; apical segment depressed as in 31. 
argenti/rons; ventral segments flattened, and having on each side a 
short obtuse projection, apical segment forcipate, tinged with rufo- 
piceous. Length lines. 
Rab. —Pike’s Peak (Coll. Ent. Soc. Phila.), Hudson’s Bay Territory 
(Coll. Mr. E. Norton). 
Closely resembles the preceding species in size and form, but is 
evidently distinct; the wings are difierently colored and the clypeus 
is not emarginate in front. The specimens are apparently somewhat 
rubbed. It answers tolerably well to the description of Chelostoma 
albifrons Kirby, but it cannot belong to that genus as it has the 
maxillary palpi five-jointed instead of three. 
M. borealis, n. sp. 
Female .—Head rather large, black, finely and densely punctured. 
