410 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



Abdomen differs from that of dilatata dilatata Spinola by having the 

 first abdominal segment reddish with the red extending irregularly 

 onto the second tergum; the second tergum also has a broad irregular 

 patch of yellow along the posterior border; venter largely yellow to 

 amber; pygidium and remamder of tergum 6 is amber. 



Male. — Length 9-10 mm. Black with reddish-amber and brown- 

 ish-yellow markings; structure like that of the subspecies dilatata 

 dilatata Spinola. 



Head coloration typical of the subspecies dilatata dilatata Spinola 

 except the antennae are somewhat lighter. 



Thorax coloration pattern follows very much that of the female 

 except the red of the propodeum is somewhat less in extent; legs are 

 light amber; wings are light amber. 



Abdominal coloration follows the pattern of the female of the 

 subspecies. 



Types. — The type female and allotype male, from Chisos Mts., 

 Big Bend National Park, July 6, 1942 (H. A. ScuUen), are in the U.S. 

 National Museum, no. 66161. Paratypes are as follows: 



Arizona: ?, southern Arizona, August 1902 (F. H. Snow); 2cfcf, 5 mi. W. 

 Southwestern Research Station, Portal, 5400 ft., July 18, 1956, Melilotus alba 

 (M. Cazier) ; ? , same locahty, Aug. 24, 1956 (E. Ordway). Texas: 7 c? cf, Chisos 

 Mts., Big Bend National Park (J. Bequaert); cf, same locality, July 6, 1942 

 (E. C. Van Dyke); 7? 9, led^cT, same locality, July 3-6, 1942 (H. A. Scullen); 

 cf, Davis Mts., Jeflf Davis Co., Aug. 22, 1936 (J. N. Knull); 9, cf, Davis Mts., 

 July 10, 1942 (E. C. Van Dyke); lOd'd', Davis Mts., June 21, 29, July 9, 1942 

 (H. A. Scullen); 2c?cf, Davis Mts., Madera Canyon Park, July 20, 1950 (Ray 

 F. Smith); 9, El Paso, June 23, 1942 (E. C. Van Dyke). Mexico: 9, 

 Chihuahua, Chih., Aug. 12, 1951, Baccharis glutinosa (P. D. Hurd) ; 2c?'c?, 18 

 mi. W. Jimenez, Chih., Aug. 10, 1951, Baccharis sp. (H. E. Evans); cT, 33 mi. S. 

 Hidalgo del Parral, 6400 f1., Oct. 24, 1957 (H. A. Scullen); 9, 10 mi. W. Nami- 

 quipa, Chih., 6600 ft., July 3, 1947 (C. D. Michener) • 9 , San Juan Del Rio, 

 Durango, 5200 ft., July 30, 1947 (C. D. Michener). 



Distribution. — This subspecies has been taken mostly in the 

 Chisos Mountains of the Big Bend National Park, Texas, but limited 

 numbers have been collected in nearby mountains and in northern 

 Mexico. 



Prey record. — None. 



Plant record. — Baccharis glutinosa (Chihauhau, Mexico), Meli- 

 lotus alba (Arizona). 



28. Cerceris fumipennis Say 



Figures 36, 131a,b,c 



Cerceris fumipennis Say, 1837, p. 381. — Dahlbom, 1845, p. 204. — Smith, F., 

 1856, p. 465.— LeConte, 1883, p. 762.— Cresson, 1865, p. 113.— Packard, 

 1866, p. 60.— Cresson, 1872, p. 227.— Tasehen berg, 1875, pp. 397-8.— 

 Schletterer, 1887, p. 493.— Cresson, 1887, p. 282.— Marlatt, 1890, p. 147.— 



