148 U. S. NATIONAL MUSEUM BULLETIN 216 



vex, its lower edge margined; thorax about 1.75 as long as high; 

 opening of propodeal spiracle about 4.0 as long as wide; median dorsal 

 carinae of first tergite extending about 0.65 its length; abdomen 

 weakly depressed; second abdominal tergite about 0.72 as long as wide. 



Black, the abdomen with weak dark blue iridescence. Apical half 

 of mandible largely ferruginous; palpi pale stramineous; scape variously 

 colored, according to the subspecies; apex of pedicel light brown; 

 tegula white basally, fulvous apically ; apex of front and middle femora, 

 upper side of front tibia, basal 0.4 (below) to basal 0.6 (above) of 

 middle tibia, extreme apex of middle tibia, basal 0.6 of hind tibia, 

 tibial spurs, first and often the second segment of front tarsus, middle 

 tarsus except apically, and hind tarsus except as noted under the 

 subspecies, ivory white; front coxa black, the apical part fulvous; 

 front trochanter and femur except at apex fulvous to brown; under 

 side of front tibia and front tarsus beyond the first or second segment, 

 fulvous; middle coxa, trochanter, femur except at apex, and tibia ex- 

 cept as noted otherwise, fulvous to black, the darker shades occurring 

 most frequently on the coxa and femur in female rather than in male 

 specimens; apex of middle tarsus fulvous to brown; apical one or two 

 segments of hind tarsus fulvous to black; apex of first three segments 

 of hind tarsus often dark. 



There is a Nearctic and a Neotropic subspecies, separable on the 

 color of the scape and of the hind tarsus : 



1. Scape above ivory to pale fulvous; first three segments of hind tarsus usually 

 whitish, with brownish to black apices, range: Neotropic region. 



la. caeruliventris caeruliventris (Cresson) 



Scape above brown, first three segments of hind tarsus entirely whitish; range: 



Nearctic region lb. caeruliventris borealis, new subspecies 



la. Leurus caeruliventris caeruliventris (Cresson) 



Exochus caeruliventris Cresson, 1868, Trans. Amer. Ent. Soc, vol. 2, p. 38; 



"(?"= ?. Lectotype: ?, Cordoba, Mexico (Philadelphia). 

 Leurus caeruliventris Townes, 1946, Bol. Ent. Venezolana, vol. 5, p. 59; generic 



position. 



Scape ivory colored apically and on the entire lower side, the rest 

 pale fulvous; apex of first three segments of hind tarsus usually dark- 

 ened, light brown to black; fourth and fifth segments of hind tarsus 

 black. 



Specimens: 2d\ 19, Nova Teutonia, Santa Catarina, Brazil, May 2, 

 1948 and July 7, 1940, Fritz Plaumann (Townes). d\Demerara River, 

 British Guiana, June 23, 1927 (Ithaca), cf, Port Parker, Costa Rica, 

 July 4, 1932, W. Willow, Jr. (San Francisco). d\ Balzapamba at 700 

 meters, Ecuador, June 5, 1938, Wm. Clarke-Maclntyre (Townes). 

 d\ Rio Blanco at 1,900 meters, Ecuador, June 1949, Wm. Clarke- 

 Maclntyre (Townes) . 9, on a banana ship from Honduras (Washing- 



