66 THE CANADIAN ENTOMOLOGIST. 



Osmia p/ienax, n. sp. 



$. — Length, 9 mm. This so closely resembles prunorum that I 

 had confounded it with it. It dififers in the following particulars : Head 

 and thorax olive green, clypeus strongly purple on the disc. Flagellum 

 ferruginous beneath. Pubescence somewhat thinner, and entirely rather 

 dull white. Tegulge shining rufotestaceous. Wings faintly dusky all over. 

 Abdomen duller, olive green with faint purple tints, punctures larger and 

 closer. Ventral scopa thin and short, pale fulvo-ochreous, uniform in 

 colour. Small joints of tarsi more or less rufescent. 



Hab. — Mesilla, N. M., at flowers of honeysuckle, April 13, 1895 

 (Miss J, E. Casad). Also one taken some time ago at Las Cruces, by 

 Prof. Townsend. Easily known by the colour of the tegulse, which is 

 very unusual for Osmia. A specimen was compared by Mr. Fox with the 

 Cresson collection, and returned with the note : " Near distincta, colour 

 paler, and wings clear throughout, tegulge testaceous, punctures of dorsu- 

 lum stronger." 



Osmia cerasi, n. sp. or var. 



9. — Length, 9^ mm.; stoutly built, very dark blue, greenish on 

 vertex and dorsum of thorax, purplish on clypeus. Pleura sometimes 

 black. This agrees with Cresson's description of O. densa in almost every 

 particular, and may be only a southern variety of it ; but it has the 

 pubescence of the occiput and thorax above bright rust-red, as Cresson 

 describes for rnstica. The thorax is distinctly green anteriorly. The 

 apical margins of the abdominal segments are dark blue, concolorous with 

 the rest. Pubescence of pleura and face entirely black ; ventral scopa 

 black. Tegulse black. Pubescence of abdomen short, black, except that 

 on first segment, which is longer and pale fulvous. The punctures of the 

 head and thorax are large, and about as close as it is possible for them to 

 be ; those of the abdomen are also close. Legs with black hairs. 



Hab. — Mesilla, N. M., on flowers of cherry, April 14th, 1895 (Miss 

 |. E. Casad); College Farm, Mesilla Valley, April 9th, 1895, on flowers 

 of plum (Miss J. E. Casad). Also one taken at Las Cruces by Miss 

 Agnes Williams (now Mrs. Herbert). The above three are all the species 

 of Osmia observed in the Mesilla Valley. 



