532 Mr. T. D. A. Cockerel! — Descriptions and 



head and thorax above strongly ochreous. Another from 

 Cotulla, at Opuntia, April 16, 1906 {Pratt), is of normal 

 size, with tlie normal pallid hair. One from Victoria, 

 Texas, April 27, 1907 (/. D. Mitchell), is of normal appear- 

 ance, bnt differs from the Cotnlla form by having the short 

 stiff brnsh of hair near the base of the anterior basitarsus 

 anteriorly dark fuscous instead of light orange. 



The female of M. arnica has remained unknown, but I 

 recognized it with some confidence in specimens from 

 Cotulla, at ]\lonarda 'punctata, May 12, 1906 {J. C. Craiv- 

 ford) ; San Diego, Texas, April 23 (Mitchell) ; and Corpus 

 Christi, Texas, at Anogra pallida, April 12, 190o {Pratt). 

 This female looks very much like M. brevis, but is especially 

 to be recognized by the very long hairs standing out from 

 the posterior border of the middle tarsus. The ventral 

 scopa is white, black on last segment ; the last dorsal seg- 

 ment is somewhat concave in profile, and has coarse, but 

 rather short, erect, black hair. The hair on the head and 

 thorax above is white or slightly greyish, sometimes (San 

 Diego specimen) largely fuscous on vertex. The clypeus is 

 normal and densely punctured. The reference of this female 

 to arnica is strengthened by the occuri-ence of similar 

 characters in the middle tarsi and scopa of M. soledadensis. 

 Cock or ell. 



Megachile comata, Cresson. 



Described from the male, but two females are before me, 

 from Albuquerque, New Mexico, Aug. 1894 {Snow). Tfie 

 female is large and robust, about 16 mm. long ; ventral 

 scopa pale yellowish, becoming white basally ; last dorsal 

 segment witli fine, erect, Avholly pale hair ; when abdomen is 

 seen from above, no black hair projects at sides ; hind basi- 

 tarsus very broad ; mandibles quadridentate. There is no 

 liffht hair-band in tlie suture anteriorly bour)diug scutellum. 



Megachile candentula , sp. n. 



^ . — Length a little over 7 mm. 



Black, including the very long antennae, mandibles, 

 tegulse, and legs ; wings strongly smoky, nervures and 

 stigma rufo-piceous ; eyes dark brown ; face with short 

 ochreous hair, not hiding surface, vertex with short sparse 

 black hair, lower part of cheeks with long abundant pure 

 white hair ; clypeus extremely densely punctured, with a 

 slender smooth median line ; front dull, rugoso-punctate ; 

 vertex with very large well-separated punctures ; mesothorax 



