BEES OF BOULDER COUNTY, COLORADO 249 



. Anterior femora bright red; lateral teeth of scutellum much smaller; apex of 

 abdomen narrower, last ventral segment curved downward (Boulder, fls. Grinde- 



lia, Aug., W. P. Ckll.) grindelise Ckll. 



Anterior femora black above; lateral teeth of scuteUum much larger; apex of 

 abdomen broader, last ventral segment not curved downward (South Boulder 



Canyon, Aug. 9, 1906, W. P. Ckll.) heUanthi Robertson 



Mr. Rohwer notes of T. martini'^, "upper part of eyes in Ufe lemon-yellow, rest 

 black." 



BOMBOMELECTA Patton 

 Thorax and basal segment of abdomen above with red hair, rest of abdomen black 

 without spots (Boulder, fls. Pulsatilla hirsutissima, April, W. P. Ckll.) 



fulvida (Cresson) 

 Abdomen with six conspicuous Hght spots (near Ft. Collins) . johnsoni Ckll,* 



CGELIOXYS Latreille 

 Female about 12 mm. long; legs red (Boulder, fls. Grindelia, Aug. 20, W. P. Ckll.) 



deplanata Cresson 

 CHELYNIA Provancher 

 Abdomen black with ivory-colored bands (Florissant) . monticola (Cresson)* 



Abdomen blue with whitish or very pale yellowish bands i. 



Larger, abdomen with four bands; hair of pleura black (Boulder, fls. Astragalus, 



June, W. P. Ckll.) pulchra (Crawford), var.$ 



Smaller, abdomen with five bands; hair of pleura hght (Florissant) 



elegans (Cresson) 5* 

 STELIS Panzer 

 Blue, with black hair; no light markings; looks Uke a small Osmia (Florissant) 



montana Cresson* 



ANTHIDIUM Fabricius 

 Females I, 



Males rj^ 



Face all black 2. 



Face with light markings 3. 



Scutellum all black; scopa strongly stained with brown (Boulder, fls. Psoralea 



tenuiflora, Aug. 8, W. P. Ckll.) tenuiflorae Ckll. 



Scutellum with light markings; scopa white (Ward. fls. Phacelia) . . . 



emarginattun (Say) 



Clypeus black, but sides of face with pale marks; scopa white (Boulder, fls. Psoralea, 



Aug. 8, W. P. Ckll.) porterae personulatum CkU. 



Clypeus at least partly hght 4. 



Abdominal bands entire; size large; scutellum with two yellow spots (Boulder, 



fls. Helianthus lenticularis, Aug. 29, 1906, Rohwer) . . . occidentale Cresson 



Abdominal bands interrupted in the middle 5. 



Lateral yellow face-marks extending above level of antennae; large species with 



bright yellow markings; scopa pale reddish-yellow (Ward, fls. Phacelia) 



conspicuum Cresson 



