Bees from Xew Mexico. 11 



]'erbascunt thapsus (very many), Rhus glabra, anil \'crbeiui 

 Mncdougali. 



Mtyachile relali'va, Cress., 1878. 



This ami the next form a little group distinguished in the 

 female by the ferruginous scopa, punctures of me.sothorax 

 relatively sparse in the middle, abdomen with hair-bands 

 mostly interrupted, and the clypeus normal. M. relativa is 

 rather small (about 11 millim.) and has the hair-bands of the 

 abdomen white, overlapped with orange hairs, so as usually 

 to ap))ear yellowish or orange. In monardarum there are no 

 overlapping hairs, unless it may be some black ones. 



Kio Kuidoso, July 30, 1 ? (C M. Barber); Rociada, 

 Aug. 20, 1 ? (IF. Porter)] Harvey's Ranch, Aug. 22 

 {W. Porter) ; Beulah, July '2Q, Aug. 18, Aug. 25, many 

 females, one at flowers of Poleinvnium jilicinum [W. Porter). 



The species evidently extends right across the northern 

 part of the continent, as I have a female from Olyujpia, 

 Washington State, at flowers of Potentilla^ June oO [T. 

 Ktncaid). 



Megachile monardarum, sp. n. 



? .—Length 13-16 millim. 



Similar to relativa, but diff'ering in its larger size; the 

 abdominal hair-bands (very broadly interrupted on the second 

 and third segments, narrowly interrupted or entire on the 

 lourth and filth) white instead of orange ; the black hairs on 

 the dark parts of the abdomen longer, conspicuous at the 

 sides when the abdomen is viewed from above ; the vertex 

 more sparsely punctured at the sides, and the two apical teeth 

 of the 4-dentate mandibles perhaps not so long. 



llab. Hill near Beulah, Aug. 19 (IF. Porter); Rio 

 Ruidoso, 6500-0700 feet, at flowers of Monarda btricta and 

 Astragalus humistratus, July 27-31 {Townsend) . 



Megachile pruina, Smith, 1853. 



Our insect is M. facuuda, Cress., now considered to be 

 identical with pruina. The following reconls are based on 

 the male, which is distinguished from the allied males Hying 

 in the same region by the simple anterior tarsi and the large 

 teeth at the apex of the abdominal venter. It is a larger 

 insect than M. Townsendiana, though variable in size 

 (11-14 millim.), and docs not have the cmarginate apical 



