236 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 41?' 



viticollis Cresson, 1878. Mexico (Sumichrast). 



Female mesothorax black, with four longitutinal yellow lines. 

 volatilis Smith, 1879. Canada. 



Notes on type; Trans. Amer. Ent. Soc, vol. 31, p. 312. Subg. Gnathias. 

 washingtoni Cockerell, 1903. Washington State. Tab. 9. 

 *wheeleri Cockerell, 1903. Texas (Belfrage). Tab. 10. 



Type.— Cat. No. 13170, U.S.N.M. 

 *wheeleri engelmannise Cockerell, 1911. Dallas, Texas (W. S. Pierce). 



Also in Kansas. 



Type.— Cat. No. 13432, U.S.N.M. 

 wootonella Cockerell, 1909. Mesilla Park, New Mexico (Cockerell). 



Visits Sophia in April. Allied to N. sayi. 

 *xaniholepis Cockerell, 1911. Los Pinos, Colorado (Carl F. Baker). 



Type.— Cat. No. 14022, U.S.N.M. 

 xanthophila Cockerell, 1900. Las Vegas, New Mexico (W. Porter). Tab. 1. 



Resembles N. superba. 

 xanthura Cockerell, 1908. Sea Cliff, Long Island, New York (N. Banks). 



Allied to N. denticulata. 

 *zehrata Cresson, 1878. "Colorado; Kansas (Ridings)." Tab. 1, 5. 



"The male of this species is readily distinguished by the short dilated scape" 

 (Cresson). 



ADDITIONAL NOTES ON BEES OF THE GENUS NOMADA. 



[The material discussed below is in the U. S. National Museum.] 

 SPECIES FROM COLORADO. 

 NOMADA (XANTHIDIUM) PERIVINCTA Cockerell, var. b. 



Female. — Length fully 11 mm.; first abdominal segment broad; 

 mandibles yellow, piceous at apex; clypeus all yellow; posterior orbi- 

 tal margins largely yellow; third and fourth antennal joints the same 

 light red, third much shorter than fourth; black disk of mesothorax 

 with two broad red bands; scutellum strongly bilobed; patch on 

 lower part of pleura all red; legs with much yellow, the general effect 

 being yellow flushed with red, the hind femora and tibiae largely black 

 behind; tegulse yellow, suffused with red posteriorly; apices of first 

 four abdominal segments with reddish-black bands; first ventral seg- 

 ment red, with a trilobed yellow mark; bases of third to fifth segments 

 rufopiceous; third s. m. very broad below, greatly narrowed above; 

 b. n. going a little basad of t. m. Differs from N. sulpJiurata Smith by 

 having third antennal joint the same color as fourth; stripes on disk 

 of mesothorax red and broad (yellow and narrow in sulphurata) ; and 

 the greater amount of yellow on abdomen. Differs from N. citrina 

 Cresson by the absence of black on the anterior and middle legs 

 (though the middle tibiae have a fuscous patch behind), and the 

 large amount of red on legs; the square face; etc. i 



One from the Baker collection, labeled " Colo. 2075." N. perivincta 

 was based on a single specimen in the collection of the Colorado Agri- 

 cultural College, simply marked "Colorado." Another specimen in 

 the same collection, also marked "Colorado," differed so much that 



