312 TIIK CANADIAN KNTfOIOLOOIHT. 



Osmia atriventris Cress., var. a. — Two males. 



Osmia amala Ckll. — One male. The hind margins of ihe abdominal 

 segments in this example are not violaceous (cf. Can. Ent., 1909, p. 131); 

 a better character to separate the species from O. intfgrella is the long, 

 dense, conspicuous fringe in the deep but narrow emargination of the 

 third ventral segment ; in integre//a the fringe is short and inconspicuous. 



Oim'ui pseudainala, n. sp. — One mil.;. Length nearly 10 mm., 

 superfici.illy similar to O. a/na/a, but very different in details of structure ; 

 head and thorax olive green, pleura and mesothorax blue-green ; hair 

 thick and long, faintly tinged with ochreous above, some long black hairs 

 on cheeks anteriorly, but none on head or thorax above, or on pleura ; 

 mandibles bidentate, the teeth of equal length (in O. vallico/a the apical 

 tooth is very long) ; flagellum 4 mm. long, rather thick, obscure reddish 

 beneath, not moniliform (it is moniiiform in O. />hysaria, chloropi, etc.), 

 much longer than in O. mertensice; teguliw with at least the anterior half 

 green ; wings ordinary, b. n. going just basad of t. m.; legs more or less 

 metallic, their hair partly black and partly white ; second and third joints 

 of middle tarsi ordinary (not globose or swollen as in O. integrdla, etc.) ; 

 hind tibia thick, with a slender base ; hind spurs not at all hooked at 

 end; abdomen shining greenish blue, the hind margins concolorous ; 

 second segment with some black hair, sul)a|Mcally, following segments 

 with much coarse bUck hair ; sixth without evident light hair, but 

 a brush of while hair on middle of seventh, conspicuous in lateral view ; 

 sixth segment wiih a deep semicircular emargination ; seventh bidentate, 

 the teeth short, and more or less concealed by hair ; venter strongly blue ; 

 first segment entire ; third with a deep wide emargination, fringed with 

 pale yellowish hair, the fringe long at sides, but even, without any long 

 falciform portion such as is found in O. seueciophila and breris. The 

 hind basilarsus is not toothed (it is toothed in O. WheeUri, enena, 

 apri/ina, Paiadeiut and o/ivacea ). 



Osmia eutrichosii, n. sp.— One male. Length about Zy-i mm.; dark 

 bluish green, the abdomen shining, the whole insect unusually hairy, the 

 hair dull white, faintly ochreous dorsally, no black anywhtre ; legs bl.jck 

 with light hair, the hind femora faintly submetallic ; antennw ordinary, 

 flagellum truncate at apex, more or less stained with ferruginous beneath ; 

 tcgula; green in front ; wings normal, b. n. meeting t. m ; middle tarsi 

 normal, very hairy ; claw joints ferruginous ; hind basitarsus unarmed ; 



