94 THE ENTOMOLOGIST. 
there is a black subbasal median spot; on the second segment the 
yellow is much narrowed in the middle. 
Nomada truttarum, 0. sp. 
3. Length about 8 mm., the abdomen fusiform and rather slen- 
der; belongs to the subgenus Xanthidiwm. Head broad, orbits not 
greatly diverging above; face with appressed silvery hair, not con- 
cealing the surface; mandibles simple; mandibles except apex, 
labrum, clypeus (a black sutural spot on each side), quadrate supra- 
clypeal patch, and large lateral face-marks (filling in the whole area 
between clypeus and eyes, and extending from upper corners of 
clypeus, touching the antennal sockets, to a point some distance 
above antennee) all pale yellow; a narrow yellow stripe, becoming 
reddish, extends up posterior orbital margins, and there is a ferru- 
ginous patch above summit of eye; third antennal joint scarcely 
over half length of fourth ; scape moderately swollen, yellow in front, 
black behind, the junction of the colours reddish ; flagellum stout and 
long, red, with the first five joints strongly blackened above, and the 
third to fifth strongly undulate ; apical joint obtuse; thorax black, 
with the hair all white, especially conspicuous on pleura; scutellum, 
four rather obscure stripes on mesothorax, part of prothorax above, 
and a large spot on anterior part of pleura, all ferruginous ; tubercles 
pale yellow suffused with red; mesothorax entirely black; tegulz 
shining hyaline testaceous, with two pale yellow spots ; wings dusky 
at apex, otherwise nearly clear; stigma dark ferruginous; b. n. going 
a long distance basad of t. m.; second s. m. large, broad above, 
receiving the r. n. at the beginning of its last third; third t. ec. 
abruptly bent; legs red, without yellow, except that the anterior 
femora are suffusedly yellowish in front; a little black at base of 
anterior femora, more on middle femora, and hind femora broadly 
black beneath except at apex; abdomen rather well punctured ; first 
segment black basally, and with the broad band red without any 
yellow ; second segment red, with an exceedingly broad lemon-yellow 
band, narrowly interrupted in the middle (by a longitudinal red band) 
and notched at each upper lateral corner; segments three to six red 
with yellow bands, on three and four widely interrupted, on six a 
median patch, not reaching the sides of the segment; apical plate 
broad, strongly notched ; venter red, suffused with blackish, and with 
a large diamond-shaped yellow spot at extreme apex. In the tables 
of Rocky Mountain Nomada runs to N. vicinalis, Cresson, from which 
it differs by the large lateral face-marks, first abdominal segment 
without yellow, &c. 
Hab. Trout Spring, Gallinas Canyon, New Mexico, May 
24th (T. D. A. Cockerell). 
Osmia malina, n. sp. 
@. Length about 9 mm., thick-set, brilliant dark indigo-blue, the 
hind margins of the abdominal segments concolorous and very nar- 
rowly impunctate; legs black, without metallic tints; antenne 
entirely black. Face broad; hair of face and vertex coarse and black, 
but on each side of the antenne is a patch of white hair, recalling the 
