No. 466.] GENUS DIADASIA. 745 
Hab.— Between Las Cruces and Mesilla Park, New Mexico, at flowers 
| of Spheralcea fendleri lobata (Wooton), middle of August (Cockerell). It 
was accompanied by Macroteropsis latior (Ckll.). 
The distribution of the species in States, etc., so far as known, 
is as follows: — 
Mrxico.— D. diminuta Cr.; sumichrasti Cr. ; enavata Cr. (Lower Cali- 
fornia). . 
CALIFORNIA.— D. albovestita Prov.; afflicta Cr. (tricincta Prov.) ; nigri- 
frons Cr.; bituberculata Cr.; nitidifrons Ckll.; Zaticauda Ckll.; friesei 
Ckl.; exavata Cr.; diminuta Cr. (Palm Spring, Davidson); australis ` 
rinconis Ckll.; australis opuntie Ckll. 
NEVADA. — D. bituberculata Cr. 
ARIZONA.— D. diminuta Cr. (Bill Williams’ Fork, Snow ; Grand 
Canon, Hopkins); australis rinconis Ckl. (Bill Williams’ Fork and Oak 
Creek Cañon, Snow) ; enavata Cr. (Oak Creek Cañon, Snow). 
New Mzxico.— D. diminuta Cr.; spheralcearum Ckll.; australis Cr.; 
australis rinconis Ck. ; enavata Cr. ; megamorpha Ckll. 
Trxas.— D. australis rinconis Ckll. (part of Cresson's original austra- 
lis, as shown by a 9 cotype) ; ezavata Cr.; enavata v. densa Cr. (a color 
variation merely) ; aflicta Cr. 
Kansas. — D. australis Cr. (Wallace Co., and Morton Co., Snow) ; 
‘enavata Cr. (Wallace Co., Snow) ; diminuta Cr. (Hamilton Co., Snow); 
afflicta perafflicta Ckll. 
CoLoRADOo.— D. enavata Cr. (Lamar, Snow, Palisade, Gilette, Jules- 
burg, Ball, Trinidad, Titus) ; enavata v. densa Cr. (Rocky Ford, in beet 
field, P. K. Blinn); diminuta Cr. (Fort Collins, Trinidad, Colo. Agric. 
Coll.) ; australis Cr. 
D. sumichrasti Cr., is peculiar for the densely punctured 
mesothorax, but the blade of maxilla is broad at base and nar- 
row apically, as in true Diadasia. The maxillary palpi are long, 
6-jointed. The sexes do not look much alike, but close com- 
parison confirms their identity. 
D. australis and its subspecies may be found visiting the 
flowers of Opuntia. The small species, diminuta and its allies, 
are addicted to the Malvacee. D. megamorpha (9) was 
recorded from the flowers of Spheralcea angustifolia, but the 
plant was really S. fendleri lobata, which had not then been 
differentiated. 
UNIVERSITY OF COLORADO, 
BOULDER, COLORADO. 
