10. 
ii. 
12. 
Sphecoidea of Nebraska 95 
Tachytes Panzer 
KEY TO THE SPECIES 
Females 
. Clypeus with the anterior margin in the middle, produced into a large 
quadrate tooth or lobe, and with several small teeth laterally... 2 
Clypeus with the anterior margin not or scarcely produced into a lobe, 
ante! most thickened ain the middle. ....(:25. ccc. ceeecne sc euece 4 
. Propodeum strongly sulcate medially, the sulcus wide; pygidium with 
SECO IER MAUISTOI A irate oi ese scene crane ane a jnloletese) oracle eiatets, shore mandibularis 
Propodeim mot) strongly sulcate medially 22. .66 sc 6..'0 ove cece odes 3 
. Third joint of antennae about one quarter longer than the fourth; 
thorax sparsely clothed with grayish pubescence; propodeum finely 
eee EMRE DR AA ae rege a. Bes ES Meets Ree kava niuty clasaber wae harpax 
Third joint of antennae but little longer than the fourth; front and 
fhOras With ‘Silvery. PUDESCEMCE sys sacle picssres oaics cas dawns calcaratus 
. Clypeus armed with a large prong on either side.............. mergus 
Glenens= withoubea, lateral Drongee 6 css ssocleclaccscak s clcwsistase tice Os 5 
PCemNGtia el att “AED UTC lcs Okie faa ceed cau e adele lawo tig woue nek ee 6 
PunAMMINEaT) RGRERE CLO BIA RS. ot2's ce a's Sis cis. bie b vle is Swigeyn v's Drrempew ee ee 8 
. Third and fourth joints of antennae equal in length; clypeus rather 
deeply emarginate medially; disc of propodeum granular..austerus 
Third joint of antennae longer than the fourth .................6- Fi 
. Pygidium not at all constricted near the apex, bronzy; species with 
considerable erect pile on the head and thorax ......... fulviventris 
Pygidium a little narrowed before the apex; pubescence rather sparse, 
rufofasciatus 
. Clypeus without teeth, its anterior margin subtruncate, with a slight 
production medially; abdomen with brassy or silvery fasciae; wings 
AVERT UISCO US. c shoue islets sicrceale oy orat ela oho oleratnscc alata ew ele fesreretetbon obductus 
Clypeus rounded out, armed laterally with more or less distinct teeth. 9 
. Metatibiae with at least the basal half of the outer posterior row of 
spines short, blunt, and thorn-like, the spines much stouter than 
those on the first’ joint of the hind tarsi; mandibles very narrowly 
ATC GILE Ce ER CSIRO Vow ergy al eyass craic Oye oh ole a) si erey eins <, dow Mota vdeo bleiets Inaba s obscurus 
Metatibiae with the outer row of spines not short as in the above, 
usually well pointed and differing but little from those of the first 
HOMMENO TER CML IN tae Sisters o Soe yevaleescioie vie asters «hasta s eretuinta ciate aetere ee 10 
Abdomen not silvery fasciate; small species, 6-8 mm.......... maestus 
Abdomen silvery fasciate; large species, 14-22 mm............... II 
Abdomen dorsally with three silvery bands; front golden ......... 12 
Abdomen dorsally with four silvery bands; front silvery .......... 13 
Posterior femora ferruginous; wings yellowish, darker at the apex, 
distinctus 
413 
