14 Prof. T. D. A. Cockerell on 



abdominal segments black, very conspicuous at the sides 

 when the abdomen is viewed from above ; white pubescence 

 dense on sides of face, pleura, tubercles, sides of metathorax, 

 sides of first abdominal segment, and on hind margins of 

 segments 1 to 5, forming conspicuous entire white bands ; 

 ventral scopa white or with a yellowish tinge, black on last 

 segment ; pubescence on inner side of tarsi dull ferruginous ; 

 clypeus ordinary, with strong punctures, well separated in 

 the middle ; antennas short ; vertex with large punctures ; 

 mesothorax microscopically tessellate, with large punctures, 

 well separated on the disk ; abdomen inversely mitre-shaped, 

 strongly punctured ; tegulai black, punctured all over ; wings 

 dusky. 



This agrees almost exactly with Cresson's description of 

 the female M. grandis, but that is the female of M.pollicaris, 

 which our insect certainly is not. Among the females found 

 in New Mexico it is known by the white scopa, black on 

 the last segment, normal clypeus, rather broad form, and the 

 absence of any spots of white pubescence on the mesothorax 

 or white band between the mesothorax and scutellum. The 

 absence of the last-mentioned marks at once separates it from 

 the superficially similar M. sidalceoz. 



$ . — Length 11 millim. 



Abdomen rather parallel-sided ; antennae long, last joint 

 not modified ; punctures of mesothorax closer ; mesothorax 

 and scutellum with scarcely any dark hairs; face densely 

 covered with silky white hair ; black hair on abdomen incon.- 

 spicuous ; cheeks simple ; anterior coxae armed with black 

 spines of moderate length ; anterior femora ferruginous 

 beneath and with a ferruginous patch above ; anterior tarsi 

 simple, but fringed with white hair ; margins of tegulse more 

 or less ferruginous ; apex of abdomen emarginate, irregularly 

 denticulate on each side of the emargination ; apex of venter 

 with three very short teeth. 



This appears to be the male which Cresson supposed (erro- 

 neously, as I hold) to belong to his M. texana. It differs 

 from that of M. rufimanus by the armed anterior coxaa. 



Hab. Santa F6, July 5-25, many males, one at flowers of 

 Cleome serrulata, 1 ? (Ckll.) ; Las Vegas, June 28-July 20, 

 both sexes numerous at flowers of Cleome serrulata, 1 ? at 

 flowers of Medicago sativa (alfalfa), one of each sex at flowers 

 of Verbena Macdougali (M. Holzman, N. Stern, E. K. Rishel, 

 A. Garlick, W. Porter, M. Winters, Ckll.) ; Albuquerque. 

 1 ?, June 30 (0&//.). 



