NO. 1806. BEES IN THE NATIONAL MUSEUM. l.—COCKERELL. 653 



The following localities produced a rather small variety, inter- 

 mediate between texana and crucis: 



(14) Kerrville, over 50, only one being a male. Collected in April, 

 many at Marrulium vulgare lowers (Pratt and Dunham). 



(15) Devils River, at Monarda citriodora, May 6 (Bishopp); at 

 Gaillardia pulclieUa, May 2 and 6 (Bishopp); at Sumach, May 3 

 (Bishopp) ; at Marilaunidium origanifolium, May 3 and 4 (Bishopp 

 and Pratt). 



(16) Del Rio, a,t Ratihida columnaris and Pyrrhojmppus carolinianus, 

 May 1 (Bishopp). 



(17) Brewster County, Rio Grande, June 13-17 (Mitchell and 

 Cushman). 



NOMADA TEXANA CRUCIS (Cockerell). 



Nomada crucis was described in 1903 as a doubtful subspecies of 

 N. texana, based on the smaller size and coarser sculpture of the' 

 metathorax. As it occurs in southern New Mexico it 

 appears sufficiently distinct from typical N. texana of 

 east-central Texas, but the abundant material now 

 before me clearly shows intergradation in south-central 

 Texas, north of the Rio Grande. I give a figure of the 

 genitalia of N. crucis fi'om Devils River. I also pre- 

 pared a slide of the genitalia of quite typical texana 

 from Piano, and so far as I can see there is no essential 

 difference. As we go down the valley of the Rio 

 Grande, practically normal N. crucis is found to be 

 mixed with larger individuals, which can be regarded 

 as rather small texana. The females lead in this in- 

 crease of size, but in humid Texas both sexes are of full genitalia of male 



„ 1, / PI Nomada Texana 



texana size, and even at CotuUa (10 males 6 females crucis. 

 examined) this is the case, with rare exceptions. It is 

 not unlikely that crucis is largely or even wholly an environmental 

 product, not gametically different from true texana. 



A single male crucis (here a mutant or dwarf of texana?) comes 

 from Ardmore, Indian Territory, August 18 (Bishopp). The Texan 

 material is as follows : 



(1) Eagle Pass, March 30; male with third antennal joint shorter 

 than usual (Jones and Pratt). 



(2) Del Rio, both sexes. May 1 (Bishopp). Some are from flowers 

 of Pyrrho pappus carolinianus. 



(3) Cotulla, a single male from Verbesina encelioides, May 11 

 (J. C. Crawford). 



(4) Devils River, 28 males, 1 female. Collected fi'om Marilauni- 

 dium origanifolium, May 3 (Pratt); SpJixralcea angustifolia,'Msij 3 

 (Bishopp); Aster sp.,M.Sij 1 (Bishopp); Sumach, May 6 (Bishopp); 

 Monarda citriodora, May 4 (Pratt) ; Gaillardia pulchella, one specimen 

 Bishopp). ( 



