10 Prof. T. D. A. Cockerell on 



Megachile latimanus , Say, 1823. 



The female is easily distinguished by its rather large size 

 (13-15 millim.), shovel-shaped abdomen, ventral scopa whitish 

 at base, becoming ferruginous at apex, broad face, and the 

 greyish-white pubescence of the vertex and mesothorax 

 hardly at all mixed with black. 



Santa F6, July and August (CkIL) ; Las Vegas, June 1, 

 $ , June 9, ? (R. Devine) ; July 6, at flowers of Verbena 

 Macdouga/i, 1 ? (W. Porter) ; July 11, at flowers of Gleome 

 serru/ata, 2 $ (M. Winters & CM/.) ; June 19, at flowers of 

 Medicago sativa, 1 ? (CM/.) ; Aug. 11, at flowers of Peta/o- 

 stemon candidus, 1 $ ( W. Porter} ; Aug. 9, at flowers of 

 Grinde/ia squarrosa, 1 ? (W. Porter) j San Ignacio, Sept. 1, 

 ? {Porter ■$ CM/.). 



This is a species of the transition zone, and it is remarkable 

 that it was neither found at Beulah nor in the White 

 Mountains. 



Megachi/e fortis, Cress., 1872. 



This species in the male exhibits a dichroism like that of 

 Anthophora occidenta/is ; the pale form is the M. comata, 

 Cress., 1872, but in a long series it becomes impossible to 

 recognize it as a separate species. The female has never been 

 described as such, but from analogy with M. /atimanus and 

 the facts of distribution I feel certain that it is the insect 

 described by Cresson in 1878 as M. texana. The male 

 assigned to texana by Cresson is a different species. 



This species inhabits higher altitudes than M. /atimanas, 

 though it also occurs in the transition zone. Las Vegas Hot 

 Springs, Aug. 10, at flowers of Senecio Doug/asii and Verbena 

 Macdouga/i, 3 £ ( W. Porter) ; Gallinas River, at La Cueva, 

 Aug. 6, 1 cJ {W. Porter); San Ignacio, Sept. 1, <J ? 

 (Porter $ CM/.) ; Beulah, end of August, 1 ? (CM/.) ; Mesca- 

 lero Indian Reservation below the Agency, at flowers of 

 Bige/ovia graveo/ens, var. g/abrata, Oct. 1 and 2, 7 ? (CM/.) ; 

 Rociada, Aug. 20, 1 ? ( W. Porter) ; South Fork of Eagle 

 Creek, 8000-8200 feet, Aug. 18-20, <$ at flowers of He/iopsis 

 scabra, ? at flowers of Erigeron macranthus and Senecio 

 Bigelovii (Townsend) ; Rio Ruidoso, July 8, at flowers of 

 Pentstemon, ? (Wooton) ; July 21-Aug. 3, 6500-7600 feet, 

 males at flowers of Verbena Macdouga/i (some of these var. 

 comata), Vicia near pu/cheUa, Monarda stricta, He/iopsis 

 scabra, Astraga/us humistratus, and PotentiUa Thurberi, but 

 only single specimens on the last two ; females at flowers of 



