no. 1818. BEES IN THE NATIONAL MUSEUM. 2—COCKERELL. 249 



above each tegula, the abdominal bands are lighter, and the femora 

 are black without the large yellow stripes. Some of the characters 

 formerly cited to separate male pecosense from poudreum, are not 

 constant. A constant character in the Arizona males is the absence 

 of yellow on the mesothorax. 



The following key separates some females of AntMdium in which 

 the scopa is pale. My A. blanditum prsedentatum seems to belong 

 rather with placitum. The female of A. pecosense so nearly agrees 

 with the description of A. blanditum from Nevada as to suggest that 

 the two represent variations or races of one species. 



Clypeus yellow, with at most lower edge, and two dots near upper margin, dark; 



mesothorax with an angular pale stripe on each side 1. 



Clypeus at least largely dark 2. 



1 . Pubescence pale blanditum Cresson. 



Pubescence fulvous, especially above; legs with less black. . . pecosense Cockerell. 



2. Mesothorax without light markings; bands on abdominal segments 1 to 5, each 



broken into four spots maculosum Cresson. 



Mesothorax with light markings 3. 



3. Mesothorax with an angular pale stripe on each side 4. 



Mesothorax with a straight mark or a spot on each side 5. 



4. Clypeus with a median black stripe placitum Cresson. 



Clypeus with a black bidentate mark on upper part; legs with more black. 



placitum prsedentatum Cockerell. 



5. Sixth abdominal segment above yellow, except at base; wings darker. 



poudreum Titus. 

 Sixth abdominal segment with two rounded pale spots; wings paler. 



montivagum Cresson. 

 Through the kindness of Professor Gillette I received a pair of 

 supposedly authentic A. poudreum, collected at Fort Collins and 

 Palmer Lake, Colorado. They are both A. tenuiflorae Cockerell, but 

 it is clear from the description of poudreum that it could not have 

 been based on specimens of tenuiflorse. 



ANTHIDIUM PORTERS Cockerell. 



Two males and one female; Marfa, Texas, June 6, 1908 (Mitchell 

 and Cushman). 



ANTHIDIUM TENTJIFLOR.E: Cockerell. 



Two males; Helena, Montana, August 6 (W. M. Mann). New to 

 Montana. 



ANTHIDIUM PHILORUM Cockerell, var. ABBOTTI, new variety. 



Male. — Length, 10 mm.; all the pubescence white; clypeus, lateral 

 face-marks, and mandibles except apex, cream-color, as also a spot 

 above top of each eye; antennae wholly black; thorax without light 

 markings; tegulse black; basitarsi light yellow, the other tarsal joints 

 light ferruginous; abdominal bands all interrupted in the middle 

 (though the last two very narrowly), and deeply and broadly exca- 

 vated (that on second segment interrupted) at sides; no light mark- 

 ings on first or last segments; apical segment with broad divergent 



