10 Prof. T. D. A. CockerelUn 



Megachile latimanus, Say, 1823. 



The female is easily distiiiguislied by its rather large size 

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

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

 greyish-white j)ubescence of the vertex and mesothorax 

 hardly at all mixed with black. 



Santa F(5, July and August {Ckll.) ; Las Vegas, June 1, 

 J , June 9, ? {R. Devine) ; July 6, at flowers of Verbena 

 Macdougali, 1 ? (W. Porter) • July 11, at flowers of Cleome 

 serrulata, 2 ? [M. Winters cfc Ckll.) ; June 19, at flowers of 

 Medicago saliva^ 1 ? {Ckll.) ; Aug. 11, at flowers of Petalo- 

 stenion candidus, 1 ? (IP'. Porter); Aug. 9, at flowers of 

 Grindelia squarrosa, 1 ? ( IF. Porter) ; San Ignacio, Sept. 1, 

 ? (Porter ^ Ckll.). 



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

 that it was neither found at Beulah nor in the White 

 Mountains. 



Megachile fortis, Cress., 1872. 



This species in the male exhibits a dichroism like that of 

 Anthophora occidentalis ; tiie pale forui is the M. comatay 

 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. latimanus and 

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

 described by Cresson in 1878 as M. texa^ia. The male 

 assigned to texana by Cresson is a different species. 



This species inhabits higher altitudes than M. latimamcs, 

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

 Springs, Aug. 10, at flowers of Senecio Douglasii and Verbena 

 Macdougali, 3 c? {W.Porter) ; Gallinas River, at La Cueva, 

 Aug. 6, 1 S (^- Porter) ; San Ignacio, Sept. 1, c? ? 

 {Porter ^ Ckll.) ; Beulah, end of August, 1 ? {Ckll.) ; Mesca- 

 lero Indian Reservation below the Agency, at flowers of 

 Bigelovia graveolens, var. glabrata, Oct. 1 and 2, 7 ? {Ckll.) ; 

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

 Creek, 8000-8200 feet, Aug. 18-20, c? at flowers of Heliopsis 

 bcabra, ? 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 Macdougali (some of these var. 

 comata), Vicia near 2>^^(^hellaj Monarda stricta, Heliopsis 

 scabra, Astragalus humistratus, and Potentilla Thurberij but 

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



