The Sphegoidea of Nebraska 55 
Genus Tachytes Panzer 
SYNOPSIS OF THE SPECIES 
Males with fore femora emarginate beneath at base and fore coxae 
with an elongated process; thorax of females not densely pubescent 1 
Males with fore femora entire; fore coxae simple; thorax of female 
Penecoilymcensel ya PUbESCEML <j.) « scittes,s ciel cieleieiels eicieyeerasotelels disuse els 2 
1. Size larger, 11-21 mm.; wings yellowish; tibiae, tarsi, and part 
of femora reddish; pubescence golden.............. distinctus 
1. Size smaller, 10-14 mm.; wings subhyaline; legs black; pubescence 
S Thy Clayman ences tetera oot Nake varct «avs tehesesas ack aootes ote So otat cote. ck eterna tars Sericatus 
2. Abdomen mostly reddish; apical segment of male antennae 
abnormal (there is occasionally a variety male with a black 
abdomen, but this is distinguishable by the abnormal an- 
(SUT [eg Sigler BS aia lan Ie aac ie er PS fulviventris 
2. Abdomen black, usually with silvery bands................. 3 
3. Legs excepting apical joint of tarsi, black; hind tarsi of male 
PAthetAStLOMS ly eSPINOSEr <aielet clyde sia se eae aloe <feucsars ela pepticus 
a. Apex of femora, tibiae, and tarsi ferruginous:......3.....2..0.60.\ 4 
21> UE INES, Ree Pe Am Oars Pee aie eae pee lev as so AAR A ne RAEI sie 8 5 
Aree CHIN UGS imate is ctvsig ste ete eas uiom Peroieierotaiisteraiciere wai cic) ote eltos gona ye eta 6 
Dwele tagsy Cite: Stronsly- SpMOSE.!. soc ca saint nus vise wie te Hee eats harpax 
bee blatrcle tarsi emOty SPillOS@res ¢cfacia ceies ie s.cloleeteltsaie e.caie deceit mandibularis 
6. Metanotum without a strong sulcus medially; pygidium 
with silvery ptbescence; size smaller................. harpax 
6. Metanotum with a strong sulcus medially; pygidium with 
COpperye piubescemces Size areer scm onyeups sce sess orm cinuene eae 7 
7. Anterior margin of clypeus medially produced into a quadrate 
tooth, with several small teeth on each side.....mandibularis 
7. Anterior margin of clypeus not produced into a quadrate tooth, 
atwinost «thickened <tmediallliv.:t 4.016 tie ec cic cmemne 6 CYASSUS 
Tachytes distinctus F. Smith. 
1856. Tachytes distinctus F. Smith, Catalogue of Hymenoptera in the 
British Museum, iv, p. 307. 
1892. Tachytes distinctus Fox, Transactions of the American Ento- 
mological Society, xix, p. 246. 
1892. Tachytes elongatus Fox, Ibid., p. 246. 
Six specimens, both sexes, from Lincoln, during August and 
September, on Euphorbia. The ferruginous on the femora of 
the female is much greater in extent than on that of the male. 
Tachytes sericatus Cresson. 
1872. Tachytes sericatus Cresson, Transactions of the American En- 
tomological Society, iv, p. 216. 
S77 
