Sphecoidea of Nebraska 83 
4. Head black; striae of propodeum becoming rugose laterally ..cressoni 
Head ferruginous; striae of propodeum more complete laterally, 
ferruginosus 
PEM M ee rtStid11 TATE SPEC. ¢cwietc sh k.c ie! n.s.0 das 1s nities plover nslduacleba tee pire 6 
RACER. fo Se, Sects ete he Sis pts yok Loha bv ciel 0 Wruield rahe RO IES 8 
6. Propodeum sharply, densely, and obliquely striated; face and clypeus 
SUMMED? «Eh cieliehi s faiaerars SF eckstiein(e, cies olsle's siere o'6 o ba PORWR SET OT alberti 
Head and clypeus black; propodeum at least centrally with transverse 
SHIGE: ak ES eR SR 0 ee ea a Th 7 
7. First joint of petiole black, i. e., with more black than second joint; 
head and thorax with silvery pubescence ................ breviceps 
First joint of petiole with more red than second joint; species of 
Lemma maSTIGLI EMORY Re fe, oct aCe a oS aver eaia vane Ye avn tao sivancuslens.s ate Ga ke pruinosus 
8. Abdomen entirely black, or with a very little red; pleura with silvery 
spots; clypeus of male produced; sides of propodeum finely rugu- 
RA MEN Cae ees OMAN R CCN Sh oes cyha icin. cc ufedaia iy archive arava neve abbreviatus 
MUM ARIRIE MISS. NEE EGU © fo re ick aa cie% <:or0 c-casP0is oo 8 Sih nae o's NE BION Oh 9 
9g. Pleura uniform dull black in color, without silvery pubescent! mark- 
INAS Se MEN re RC TOR Reh ON Ne noice 4 eer a ssh BOD a Shela ea hrc 10 
Pleura with markings of silvery pubescence; wings hyaline or nearly 
5a URE ee eRe ct GA neg ce ee At ner aae: © II 
10. Wings black, violaceous; second segment of petiole usually black 
2 Op pe oeeree Peay iae MA REN los Had UR EARS nigricans 
Wings yellowish, usually.darker apically; second segment of petiole 
TIStTCUNVERG ECA OVE matice es eet lactis sin ace, @ wise a sista e.stelpoteem extrenutatus 
11. Thorax with dense silvery pubescence throughout ......... argentatus 
Thorax with more or less sparse silvery-cinereous pubescence..... 12 
12. Propodeum dorsally with well-marked oblique striae, generally con- 
Peered bya faised miediat We Li. st. . e es ssp sd ecawe tiene one vulgaris 
Propodeum without a raised median line ............0.-eeseece ems 13 
Eeehresanotum . sttigose near the ‘Sid€s 2... 006.66. ceneeeeze cons urnarius 
Mesonotum simply punctate throughout ..............cseeeceeees 14 
a UtETINSTED ISDATSEIG. TURICLALC® 5255's u ate's eves olen wins 0.5.0 pele ure ites strenuus 
Scutellum channelled longitudinally; thorax very sparsely punctate, 
junceus 
Sphex abbreviatus (Fabricius). 
1804. Pelopoeus abbreviatus Fabricius, Syst. Piez., p. 204. 
1856. Ammophila moneta F. Smith, Cat. Hym. Brit. Mus., lV, p. 219. 
1903. Ammophila abbreviata Melander, Psyche, X, p. 160. 
Males 35, females 13: Child’s Point (3), Omaha (40), Louis- 
ville (1) and Lincoln (4) ; July 10 to September 20; visits flowers 
of Melilotus alba, Chamaecrista fasciculata and Symphoricarpos 
symphoricarpos. 
401 
