248 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 40. 



DIANTHIDIUM SIMILE Cresson. 



Two males; Kerrville, Texas, April, 1907, collected by H. Durham, 

 one dated April 14, at flowers of Marrubium vulgare. The Texas 

 D. simile is not altogether typical, and should perhaps be separated. 1 



DIANTHIDIUM PARVUM Cresson. 



Two of each sex; Flagstaff, Arizona, at flowers of 7m, June 11, 

 1909 (F. C. Pratt). This species has the same structure as D. simile, 

 and is perhaps only to be regarded as a western race. The male of 

 D. pudicum Cresson is distinct by the more strongly lobed apex of 

 abdomen. 



DIANTHIDIUM TEXANUM Cresson. 



One of each sex; Dallas, Texas; the female, March 2, 1908 (with 

 a second label, evidently erroneous, giving date April 28, 1908); 

 the male, May 3, 1908 (C. E. Hood). Cresson describes only the 

 male, but the female looks just the same, except that the middle 

 third or more of the clypeus is black. The ventral scope is yellowish 

 white. 



ANTHIDIUM PECOSENSE Cockerell. 



One male and two females; Flagstaff, Arizona, at flowers of Iris, 

 June 11, 1909 (F. C. Pratt). The male type of pecosense has the 

 second r. n. meeting the outer t. c; in the three Arizona specimens 

 it goes beyond it, in the manner of Dianthidium. A minute com- 

 parison of the males leaves no doubt that they belong to the same 

 species. The female is similar but rather smaller, with the clypeus 

 and lateral face marks yellow, as in the male; mandibles with much 

 yellow; labrum black; a yellow occipital stripe, broadly interrupted 

 in the middle; cheeks black; thoracic yellow markings better devel- 

 oped than in male, with the axillse and hind margin of scutellum 

 (narrowly interrupted in middle) broadly yellow; legs with more 

 yellow, the femora with a large yellow stripe or band; band on first 

 abdominal segment notched behind, not divided into four spots; 

 sixth segment yellow, with broad low rounded lateral lobes; ventral 

 scope glittering pale fulvous. 



ANTHIDIUM POUDREUM Titus. 



This has been printed pondreum, a misprint for poudreum. Mr. 

 Pratt took four males and two females at Flagstaff, Arizona, at Iris 

 flowers, at the same time as the A. pecosense cited above. The 

 Arizona males are more robust than Colorado specimens usually are- 

 The female is like that of A. pecosense, but the clypeus has a large 

 black triangle with the apex pointing downwards, the whole clypeus 

 being divided into three subequal triangular areas, one black and 

 two yellow. The yellow of the mesothorax is confined to a stripe 



J See Cockerell, Proc. Ent. Soc. Washington, vol. 9, 1908, p. 72. 



