THE ANNALS 



AND 



MAGAZIiNE OF NATURAL HISTORY. 



[RIG PITH SERIES.] 

 No. 87. MARCH 1915. 



XXT. — Descriptions and Records of Bees. — LXV. 

 By T. D. A. CocKERiiLL, University of Colorado. 



Mesotrichia cuernosensis, sp. n. 



? . — Length about 23 mm., anterior wing 24. 

 Very robust, black, thorax above (except a naked smooth 

 shining space in middle of mesothoiax, marked anteriorly 

 by a groove) densely covered with short bright fox-red hair, 

 intermixed with black ; abdomen strongly and rather closely 

 punctured, its hair entirely black, not iiiding the surface. 

 Head broad ; face with mixed black and pale yellowish hair ; 

 on vertex the hair is mostly black, but on occiput ferrugi- 

 nous, on posterior part of cheeks above yellow, paler lower 

 down, the lower part of cheeks with long black hair ; 

 mandibles bidentate ; labrum with a very strong median 

 tubercle ; clypeus dull, very densely punctured, with a 

 raised but not shining median line ; ridge between antenna; 

 obtuse, very feebly grooved ; third antennal joint a trifle 

 longer than next three together ; flagellum, except basally, 

 dull ferruginous beneath ; tubercles and upper part of 

 pleura with red hair, the rest with black ; tegulse black, 

 basally with red hair. 'Wings very dark fuliginous, with 

 rosy tints, the apical field with greeu ; first t.-c. incomplete 

 at lower end. Legs with black hair, anterior tibiae with a 

 fringe of yellow hair behind ; hind femora with a small red 

 button-like spot or lobe on each side apically ; scale-like 

 Ann. i& Mag. N. Hist. Ser. 8. Vol xv. 18 



