AMERICAN HYMENOPTERA. 323 



venter sparse; pygidium flattened broad at the tip, minutely granular. Legs 

 testaceous, tibial spurs long, wliitish, tibial spines yellow, poorly developed. 

 Length, 4 mm. 



Fig. 38; petiole. 



Three females. Fedor, Lee Co., Texas. May and October, 1899 

 (Birkman). 



This species superficially resembles mevolella Ckll. and Casad., 

 but is easily recognized by the sparse black hairs of the head. 



91. .Hiililla phaMlra Blake (154). 



One specimen, from Marble Falls, Texas, November 11, 1899, 

 differs in the erect hairs being white instead of golden. 



Group hexagona. 



92. Mutilla hexagona Say (161). 



Wood's Hole, Mass. ; Kansas (Westcott) ; Nebraska (M. C. Z.) ; 

 Fedor, Texas (Birkman). 



93. Mutilla dubitata Smith (162). 



Wood's Hole, Mass.; Bath, Illinois, August ; Virginia, Kansas 

 (M. C. Z.) ; Columbus, Texas (Cockerel!) = var. dubitata. 



Fedor, Texas, April-October (Birkman); Idaho (M. C. Z.) ; 

 Mesilla Park and Organ Mountains, New Mexico (Cockered) = var. 

 oniativentris Cresson (fig. 40 ; petiole). 



This species is remarkably variable in color, size and structure. 

 The sculpture of the pygidium is subject to variation. Normally the 

 silvery markings of the second segment of the abdomen are linear; 

 two females from Medlla Park, N M., and Santa Rosa, Mexico, 

 have these spots ovate. Not rare. 



94. >l ut ilia nestor Fox (163). 



This species was common during June, 1900, at Galveston, Texas, 

 flying over flowers like the males of the group Sphcerophthalmq. 

 It occurs off the Coastal Plain at Fedor, Texas, also. 



95. Mut ilia Grotei Blake '164). 



The Museum of Comparative Zoology contains this species from 

 Texas. 



96. Mill ilia proniethea Blake (165). 



A single male was taken at Fedor, Texas, by Mr. Birkman. 



TRANS. AM. KNT. SOC, XXIX. OCTOBER. 1903 



