ROCKY MOUNTAIN BEES l8 5 



smooth area bounded by a strong 

 rim; body coarsely punctured. 



Heriades Spin. (P.) 



Base of abdomen not thus formed, the basal 



area not surrounded by a rim; 



body more delicately punctured. 



Chelostoma Latr. (P.) 



Maxillary palpi 4-jointed. _ _ 



Female clypeus smooth and shining, emar- 

 ginate in the middle; first joint 

 of labial palpi nine-tenths length 

 of second. Titusella Ckll. (N.) 



Clypeus ordinary. 



First abdominal segment at base 



with a wide impunctate 



basin; male with abdomen 



ending in four small 



teeth. 



AshmeadieUa Ckll. (N.) 



First abdominal segment at base 



rounded, with a narrow 



sulcus; male abdomen 



not ending in four teeth. 



Robertsonella Titus (N.) 



Maxillary palpi 5-jointed; male antennae modified. 



Alcidamea Cresson (one species) (N.) 



cc Rather large bees, resembling Osmia, but black, with long, 

 parallel-sided abdomen; male with clypeus subemarginate, 

 and antennae approaching the Alcidamea type, but without 

 an apical hook; maxillary palpi 5-jointed. _ 



Monumetha Cresson (one species) (N.) 



(The few black species of Osmia will come in here and 



will be distinguished by the 5 -jointed maxillary palpi, 



combined with normal antennae in the male.) 



b Metallic, dark or brilliant blue or green, pollen-collecting bees, with 



a pulvillus; maxillary palpi 5-jointed. Osmiinae 



r Osmia Panzer (P.) 



c Metallic or non-metallic parasitic bees, with or without light markings; 

 postscutellum not toothed. Stelidinae. 



Second submarginal cell receiving both recurrent nervures. 



Chelynia Provancher (N.) 



Second recurrent nervure received at or beyond apex of second 



submarginal cell. Stelis Panzer (P.) 



d Non-metallic, sometimes partly red, parasitic bees, rather like Coe- 

 lioxys in form, but eyes not hairy; postscutellum with a median tooth; 

 no pulvilli. Dioxynae. Dioxys Lepeletier (P.) 



e Black bees with conspicuous yellow or whitish markings; pollen- 

 collecting. Anthidiinae. _ 



No pulvillus; cottony material used in preparing nests, which 

 are in burrows. Anthidium Fabr. (P.) 



Pulvilli present; nests made of resin, on rocks, etc. 



Dianthidium Ckll. (P.) 



