218 Mr. T. D. A. QockaroW— Descriptions and 



as M. communis, Cresson, having been so determined by 

 Mr. Fox. The total absence of black hair on the thorax, 

 the very large second submarginal cell, and the entirely 

 ferruginous tarsi, separate it sufficiently from M. communis 

 of the Eastern States. The variety differs from the type 

 much as M. ayilis differs from M. aurigenia. 



Xenofflossodes guiierrezia:, sp. n. 



$ . — Agrees with X eriocarpi (CklL), except in the 

 following characters : — 



Larger (length 10 ram. or rather more) ; flagellum black, 

 and rather longer; mandibles with no yellow spot or patch ; 

 ii])per margin of yellow on clypeus straight ; labrum black ; 

 hind margin of first abdominal segment much more narrowly 

 pallid. 



Hub. Fillmore Caiion, Organ ]\Its., New ]\rexico, at 

 flowers of Gutierreziae (the hind legs are loaded with the 

 bright orange pollen), Aug. 29 (C. H. T. Townsend). 



Diadasia euavata, Cresson. 



At Mesilla, New Mexico, July 18, I took three females at 

 flowers of Heiianthus annuus. 



Crocisa WaUacei, sp. n. 



S • — Length 9 mm. (but abdomen much retracted in 

 specimen measured) ; wing 9| mm. 



Belongs to the group of C. histrio (scutellum with W-like 

 margin, abdomen with lateral marks not divided), and has 

 the blue patches consisting of very bright and shining scales, 

 in the manner of C. cceruleifrons. Ditiers from C. nitidula 

 by havdng two blue spots on the scutellum, and the first 

 abdominal segment with very large quadrangular lateral 

 blue patches, leaving a black median band and the hind 

 margin, like a reversed T. The entirely black tarsi, without 

 any blue scales, and the smaller size separate it from 

 C. abdominalis, Friese (from Jav»). The abundant blue 

 spotting on the thorax and other characters separate it 

 from C. nana, Friese. Apical half of labrum ferruginous ; 

 clypeus except anterior margin (which is broadly black and 

 densely punctate) and sides of face up to level of ocelli 

 covered with very brilliant silvery blue-green scales ; middle 

 of front black and punctured, the punctures of two sizes, 

 not dense; antcnnie bhick, the flagellum greyish; third 

 antcnnal joint a little shorter than fonith; front and vertex 



