454 Mr. T. D. A. Cockerell on 



coarsely roughened, nude ; hind margin of prothorax marked 

 by a line of snow-white pubescence; base of metathorax dull, 

 hardly sculptured, more or less overlapped by a thin tuft of 

 long hairs springing from just behind it; pleura and sides of 

 metathorax with white hair ; tegulai dark brown, pubescent 

 in front and behind ; wings perfectly clear, nervures piceous, 

 a small but distinct stigma ; second submarginal cell receiving 

 the first recurrent nervure almost at its extreme base, the 

 second near its end ; legs black, with white hair, small joints 

 of tarsi ferruginous, basal joints of tarsi with orange-fulvous 

 hair on inner side ; tibias conspicuously dentate-tuberculate on 

 the outer side ; abdomen shining, sparsely punctured, bare, 

 hind margins of segments with narrow pure white hair-bands; 

 apex with dark purplish-ferruginous hair ; ventral scopa 

 white. 



Hab. La Cueva, Organ Mountains, N. M., on flowers of 

 Echinocactus Wislizenii, Sept. 4, 1898 (G. H. T. Townsend). 



This is clearly distinct from L. apicalis, as determined by 

 Mr. Fox ; it also differs from the other described species. 



Melissodes crenulaticornis, sp. n. 



$ . — Length about 10 millim., antennas about 8^ millim. 



Black, with dull white pubescence, that on anterior part of 

 mesothorax fulvous, on hind part of mesothorax and scutellum, 

 except the hind border, fuscous, but not mixed at allioith black. 

 Head considerably broader than long, facial quadrangle nearly 

 square ; clypeus with the upper half black, the lower half 

 primrose-yelloic ; labrum and mandibles black; antenna 

 wholly black, strongly crenulate, the joints without, the longi- 

 tudinal keels of M ruidosensis ; mesothorax with strong but 

 shallow punctures; base of metathorax roughened, with a 

 longitudinal impressed line ; tegulas black, shining, with 

 minute punctures ; wings perfectly clear, nervures dark 

 brown, third submarginal cell narrowing more than half to 

 marginal ; legs black, with white pubescence, pale orange on 

 inner sides of tarsi ; abdomen short and broad, dull and 

 closely punctured ; second to sixth segments with broad 

 conspicuous apical white hair-bands ; there is no trace of a 

 band on the first segment, except perhaps at the extreme 

 sides, but the segment is quite hairy. 



Hab. Prude's Summit, liuidoso, New Mexico, July 29, 

 1898 (C. M. Barber). 



This is closely related to a male which Mr. Fox lias iden- 

 tified as M. dentiventris, Sm., but differs from that at once 

 by the black antennas and dark nervures. It may also be 



