532 Mr. T. D. A. Cockerell — Descnpfwns and 



licarl and thorax above stronoly oclireous. Another from 

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

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

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

 ance, hnt differs from the Cotnlla form hy having the short 

 stiff brush of hair near the base of the anterior basitarsns 

 anteriorly dark fuscous instead of light orange. 



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

 recognized it witli some confidence in specimens from 

 Cotulla, at Monarda pnncfafa, May 12, 1906 (./. C. Craiv- 

 ford) : San Diego, Texas, April 2S {Mitchell) ; and Corpus 

 Christi, Texas, at ^«o/7?'a pallida, AprW 12, 190G (P7'aft). 

 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 om last segment ; the last dorsal seg- 

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

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

 thorax above is white or slijjhtly 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 occurrence of similar 

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

 Cockerell. 



Megachile comata, Cresson. 



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

 from Albuquerque, New ]\Iexico, Aug. 1894 (Snoiv). Tfie 

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

 scopa pale yellowish, becoming Avhite basally ; last dorsal 

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

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

 tarsns very broad ; mandibles quadridentate. Tiiere is no 

 light hair-band in the suture anterior!)^ bounding scutellum. 



Megachile candentida, sp. n. M 



(^ . — Length a little over 7 mm. 



Black, including the very long antennae, mandibles, 

 tcgulffi, and legs ; wings stronglj'^ smoky, nervures and 

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

 ochrcous 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 



