82 Clarence E. Mickel 
Chlorion pennsylvanicum (Linnaeus). 
1763. Sphex pennsylvanica Linnaeus, Syst. Nat., 12th ed., I, p. 941. 
1906. Chlorion (Protorosphex) pennsylvanicum Fernald, Proc. U. S. 
Nat. Mus., XXXI, p. 405. 
Males 29, females 15: Omaha (6), Union (1), Louisville (15), 
Lincoln (19), West Point (1) and Glen (2); June 21 to Sep- 
tember 10; visits flowers of Melilotus alba, Asclepias syriaca, 
Petalostemum sp., Symphoricarpos symphoricarpos, Solidago 
glaberrima, Chamaecrista fasciculata and Euphorbia sp. 
SEHECING 
KEY TO THE GENERA 
1. Front wings with two cubital cells; petiole long, two-jointed, as in 
Sphex; submedian cell as long as the median ............ Coloptera 
Front wings with three cubital cells; submedian cell a little shorter 
than thesmediant 2723.55 of8ss WoO cae tw te eelae Mile na eee ere 2 
2. Petiole of the abdomen very long, two-jointed, the second segment 
being elongate and slender, forming with the first a long petiole, 
Sphex 
Petiole of the abdomen not especially long, one-jointed, the second seg- 
ment bell-shaped; clypeus in the female with a more or less dis- 
LITICE MIM EMIAN ena IMAC IOR, bcretees ee sele| ners ss) etches ee arera) 7 oat Psammophila 
Coloptera LePeletier 
Coloptera wrighti Cresson. 
1868. Coloptera wrightti Cresson, Trans. Amer. Ent. Soc., 1, p. 378. 
1903. Coloptera wrightii Melander, Psyche, X, p. 162. 
Females 2: Bridgeport, July 10, 1912 (L. M. Gates); Pine 
Bluffs, August 27, 1893. 
Sphex Linnaeus 
KEY TO THE SPECIES 
1. Pronotum or mesonotum or both, more or less transversely striated 
Ot) Rides he a dine ho Ree niaels Wenn ne oii eee eee ose en ea 2 
Mesonotum either smooth or punctured, but not’ with complete trans- 
VEESBis SERIAGI hee Sati ote ele Races weet onndicl avait vaieli eres aatle Rete eee 5 
2! Thorax and‘lees, entirely black: - 22:5. %ntist «os lees emis op = ere See B 
Thorax and lees iin’ part hed. ccs see aoc atonal mide een eee 4 
3. Size large, 22-30 mm.; pleura with pubescent stripes ........ procerus 
Size small, 14-16 mm.; pleura entirely silvery pubescent ....... politus 
400 
