94 THE ENTOMOLOGIST. 



there is a black subbasal median spot ; on the second segment the 

 yellow is much narrowed in the middle. 



Nomada truttartim, n. sp. 



(? . Length about 8 mm., the abdomen fusiform and rather slen- 

 der ; belongs to the subgenus Xanthidium. 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 antennae) 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 ; fiagellum 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 ; tegulae 

 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. c. 

 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 Eocky 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 mallna, 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 ; antennas 

 entirely black. Face broad ; hair of face and vertex coarse and black, 

 but on each side of the antennae is a patch of white hair, recalling the 



