52 Clarence E. Mickel 
Lindenius LePeletier 
KEY TO THE SPECIES 
Females 
1. The two convexities of the enclosure of the propodeum smooth, pol- 
ished; posterior tibiae yellow at base only; clypeus black ....... 2 
The two convexities of the enclosure of the propodeum distinctly and 
obliquely striated, subopaque; posterior tibiae yellow except spot 
within .Glypeus® yellow; wanes «a eaia cae lecithin nee ieee flaviclypeus 
2. Cheeks with a blunt spine beneath; scutellum black ....... buccadentis 
Cheeks not spined beneath; scutellum marked with yellow ...... errans 
Males 
1. Cheeks not spinose beneath, unarmed; hind tibiae yellow at the base 
osha Oe aera Sinan Wine hrm gs SRG as noe A Ec errans 
Cheeks ‘with: a stfotig spine beneath... 12 cs0--cay ence oe ee eee 2 
2. Convexities of enclosure of propodeum distinctly striated; hind tibiae 
except a blotch within, clypeus and scape entirely yellow.armaticeps 
Convexities of enclosure of propodeum smooth, polished; hind tibiae 
yellow at base only; clypeus and scape posteriorly black. buccadentis 
Lindenius flaviclypeus (Fox). 
1895. Crabro flaviclypeus Fox, Trans. Amer. Ent. Soc., XXII, p. 186. 
Females 4: Mitchell (1), Glen (2) and Harrison (1); June 
17 to August 20; visits flowers of Helianthus sp. 
Lindenius armaticeps (Fox). 
1895. Crabro armaticeps Fox, Trans. Amer. Ent. Soc., XXII, p. 185. 
Males 1: Harrison, August 4, 1908 (C. H. Gable) ; visits 
flowers of Helianthus sp. 
Lindenius buccadentis Mickel. 
1916. Lindenius buccadentis Mickel, Trans. Amer. Ent. Soc., XLII, 
Pp. 427. 
Males 2, females 6: Omaha (5), West Point (1) and Glen 
(2) ; June 20 to August 18; visits flowers of Chamaecrista fascic- 
ulata, Solidago sp. and Gutierrezia sarothrae. 
Lindenius errans (Fox). 
1895. Crabro errans Fox, Trans. Amer. Ent. Soc., XXII, p. 184. 
1908. Lindenius errans H. S. Smith, Univ. Nepr. Stupies, VIII, p. 
404. 
372. 
