750 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



O. (Ceratosmia) lignaria Say. 



Has been captured in New Haven, 25 May, 1904 (B. H. W.), 

 4 May, 1904 (H. L. V.), and in Branford, 8, 11, 26, 29 May, 1905 

 (H. W. W.), visiting apple and quince blossoms. 



0. (Centrosmia) bucephala Cresson. O. latitarsis Cresson. 



O. (Osmia) pumila Cresson. 



New Haven, 17 June, 4 July, 1905 (H. L. V.). Visits flowers 

 of the red raspberry. 



O. (O.) major Robertson. 



New Haven, 9 June, 1905 (B. H. W.) ; Branford, 3 July, 1906, 

 (H. W. W.), visiting flowers of honeysuckle (Lonicera fragran- 

 tissima). 



O. (O.) simillima Smith. 



*0. (O.) atriventris Cresson. 

 Farmington ( ?) ; Berlin, 30 June, 1905 (W. E. B.). 



O. (O.) rustica Cresson. 



Branford, 29 May, 1905 (H. W. W.), on lilac blossoms. 

 0. (O.) vicina Cresson. 



*0. (O.) purpurea Cresson. 

 Farmington ( ?). 



*0. (Nothosmia) distincta Cresson. Howard, Insect Book, 

 PI. iii, Fig. 13. 



Farmington (?). 



0. (Monilosmia) canadensis var. cognata Cresson. Howard, 

 Insect Book, PI. iii, Fig. 18. 



*0. (Diceratosmia) conjuncta Cresson. O. quadridentata. O. 

 cressoni. 



*0. (Leucosmia) albiventris Cresson. 



Andronicus Cresson. 

 To this group belong black, slender species. 



Key to Species. 



Females. 

 I. Mandibles tridentate; clypeus coarsely punctate; ventral 



scopa whitish 2 



Mandibles quadridentate; clypeus finely punctate; ventral 

 scopa yellowish cylindricus 



