Sphecoidea of Nebraska 89 
Chalybion Dahlbom 
Chalybion coeruleum (Linnaeus). 
1758. Sphex coerulea Linnaeus, Syst. Nat., 1oth ed., p. 571. 
Males 42, females 40: Omaha (26), Louisville (12), South 
Bend (5), Roca (1), Lincoln (12), Red Cloud (1), Maskell (3), 
West Point (10), Badger (1), Carns (1), Brady Island (1), 
Haigler (1), Harrison (1), Glen (1), Bad Lands (1) and Sioux 
county (1); June 13 to September; visits flowers of Chamae- 
crista fasciculata, Euphorbia marginata, Monarda sp. and Cleome 
sp. 
Sceliphron Klug. 
Sceliphron coementarium (Drury). 
1770. Sphex coementaria Drury, Jl. Nat. Hist., 1, p. 105. 
Males 66, females 68: Rulo (1), Child’s Point (1), Omaha 
(38), Louisville (14), Meadow (2), South Bend (2), Ashland 
(1), Lincoln (42), Fairmont (2), Concord (1), West Point (13), 
Hitchcock county (1), Haigler (2), Halsey (1), Bridgeport (1), 
Monroe Canyon (6), Bad Lands (1) and Sioux county (1); 
June 12 to September 14; visits flowers of Melilotus alba, 
Chamaecrista fasciculata, Solidago sp., Achillea millefolium, 
Euphorbia marginata and Helianthus sp. 
LARRINAE 
KEY TO THE TRIBES 
Posterior ocelli perfect; inner margins of eyes subparallel; pronotum tri- 
SEE EMULE etre: Shoat sete nai Kerw Wk Resi ke oe ee es dinars ay whois Lyrodini 
Posterior ocelli imperfect, flattened; inner margins of eyes strongly con- 
VEEoIIo ANOVE PLrOnotiuind SIMPLE) o 4. sce ees cies 0 c.s,gan ele weleue a Larrini 
LYRODINI 
Lyroda Say 
KEY TO THE SPECIES 
Size large, 14-15 mm.; wings dark smoky; form stout, opaque black, abdo- 
men without silvery pile; anterior margin of clypeus of female not at all 
LCS R CMH LL LCUL LU henner ater ae ie icca ranean oa. ehy to ele Pots in rerio’ «1c arene atee ake triloba 
Size smaller, 7-13 mm.; wings hyaline, tips dusky; more slender than the 
above, and with silvery pile on the abdomen; anterior margin of clypeus 
of female armed with three distinct teeth laterally .............. subita 
407 
