Records of Bees. 265 



verhesince i\\& \\\\\(\ basitarsus much exceeds the other joints 

 together.) From M. sidalce<p, (!kll., the new species is easily 

 known by tlie absence of the cons[)icuou3 white line of hair 

 across the thorax, and the total absence of black hair on the 

 scutelliira. 



The vertex has a small amount of fuscous hair among 

 the white, but the mesothorax none. The second abdominal 

 segment has a little fuscous hair, almost concealed by the 

 white. 



IJah. Upper Hio Grande, at llinconada, New Mexico, at 

 flowers of Verbesina exauriculata, Sept. 20 [Cockerell) . 



Alegachile popuU, Ckll. 



Renewed study convinces me that M. opuntiarum ^ Ckll., is 

 conspecific with populi. 



Megachile emoryl^ Ckll. 



This fine species has hitherto been known only by the 

 unique ty])e, but Mr, S. A. Rohwer took a female at Boulder, 

 Colorado, Aug. 30, 1907, at flowers of Ilelianthus pumilus. 



Megachile perihirta, Ckll. 



rjopeland Park, Boulder County, Colorado, Sejjt 6, 1907 

 {S. A. liohiLcr). This is the second specimen known. 



Megachile mucorosa, sp. u. 



($ . — Length about 11 mm., width of abdomen about 1^. 



Black, with dull white pubescence, abundant on head and 

 thorax, pure white and dense on face and lower part of 

 cheeks ; no black or fuscous hair angwhere, but inner side of 

 tarsi with orange hair. Head rather large ; eyes yellowish 

 green, slightly converging below; antennse black, faintly 

 crenulated, not flattened or expanded at apex ; clvpeus 

 normal ; vertex and mesothorax dull, with feeble punctures; 

 tegulse reddish, darker basal ly. Wings nearly clear, the 

 nervurcs and stigma rather dark ferruginous. Legs black, 

 the anterior ftviora largely red above and the anterior tibicc 

 with the inner surfacts red, their tarsi simple; coxal spines 

 distinct but short, with a little patch of sliining copper-red 

 hair at outer base ; hind tarsi rather thick. Abdomen with a 

 large shining basin on first segment, the other segments 

 strongly depressed basally and furrowed apically ; sixth 

 segment densely punctured above, ivith a strong longitudinal 

 keel, which points toward the apex of the transverse Icetl, 



