Pomona College, Claremont, California 53 



a similar patch, though less conspicuous. Another related but dis- 

 tinct species is O. sanctie-roice. 



Habitat: Mountains near Claremont, California {Baker; 

 Pomona coll. 182, part). This may be a southern subspecies of 

 O. tristella. 



A totally different Osmia from Claremont (Baker), marked 182, 

 is O. novomexicana CklL, with the hair of the thorax above less 

 brightly colored than in New Mexico specimens, but otherwise iden- 

 tical, 



Osmia uigroharhata sp. n. 



? Length a little over 10 mm.; robust; head, mesothorax and 

 scutellum dark green; pleura and metathorax much bluer; abdomen 

 shining greenish-blue; legs black, without metallic tints; head broad; 

 eyes pea-green; mandibles tridentate, the teeth very large; clypeus 

 black (except borders), with dense coarse black hair, contrasting 

 with pure white hair on sides of face; front and vertex with hair 

 mixed black and white; upper part of cheeks with white hair, lower 

 with more or less black; flagellum short, very obscurely reddish 

 beneath; mesothorax and scutellum with extremely dense small 

 punctures; area of metathorax shining except basally; mesothorax 

 with thin white hair, with some black intermixed; tubercles with 

 pale hair, but pleura with black; scutellum with abundant creamy 

 hair, a few black intermixed; metathorax with black hair on lower 

 part of sides, otherwise with pale; legs with black hair, more or 

 less brownish on tarsi, a small tuft of pure white on posterior knees; 

 tegulae black, green in front; wings brownish, especially the broad 

 apical margin; first r. n. joining second s, m. at a distance from 

 its base equal to length of first t. c. ; abdomen with white hair on 

 first segment, scanty black hair beyond, but grayish-white on sixth 

 and apical margin of fifth; scopa black. 



Habitat: Claremont, California {Baker; Pomona coll. 182, 

 part) . Easily known by the contrasting black and white hair on 

 face. It resembles O. senior Ckll., but differs by the shining area of 

 metathorax, tridentate mandibles with large teeth, etc. 



Osmia meUuwpIeiira sp. n. 

 9 Length about 7.5 mm.; dark blue-green, densely punctured 

 but somewhat shining; facial quadrangle longer than broad; mandi- 



