The Sphegoidea of Nebraska 29 
Family MELLINIDAE 
Genus Mellinus Fabricius 
SYNOPSIS OF THE SPECIES 
At least three basal segments of abdomen red; legs black and yellow; 
abdomen of female without yellow maculae.............. abdominalis 
Petiole only of abdomen red; remaining segments black with yellow mac- 
Wlae daterallys lees red ‘and, yellow... s.r. sc cc doce ce cth oo ec rufinodus 
Mellinus abdominalis Cresson. 
1881. Mellinus abdominalis Cresson, Transactions of the American 
Entomological Society, ix, p. 39. 
1894. Mellinus abdominalis Fox, Entomological News, v, p. 202. 
Found only in the northwestern corner of the state, ten speci- 
mens of both sexes from Glen, August 20-21, (P. R. Jones, H. S. 
Smith) being before me. This species, as indicated in the above 
table, may be recognized by the almost entirely red abdomen. 
Mellinus rufinodus Cresson. 
1865. Mellinus rufinodus Cresson, Proceedings of the Entomological 
Society of Philadelphia, iv, p. 475. 
1894. Mellinus rufinodus Fox, Entomological News, v, p. 201. 
One specimen from West Point, September (L. Bruner). The 
red first segment or petiole serves to distinguish this species from 
the other members of the genus. 
Family TRYPOXYLIDAE 
Genus Trypoxylon Latreille 
. 
SYNOPSIS OF THE SPECIES 
NG OIMenMeritibe ya Dlacks sac chien bicia cc sidicoig aleuachg cleeinen cata dale niece 1 
Pie ommone DatidedenwaAtht= GeGddiShiiec,. ciereciciieve ovate slew! s « ates stots cere le overeltios 2 
1. Size large, 18 to 25 mm.; wings purplish black, body with black 
pile; metanotum punctured; posterior tarsi whitish. ..albitarse 
1. Size small, 7 to 10 mm.; wings hyaline, apical margins darker; 
body with silvery pile; metanotum striated; posterior tarsi 
TAOARTMNLU ew fe ooh tts cord cere Glee eter Waa a See Se EE ee frigidum 
2. Thorax, front and abdomen with beautiful golden pubes- 
cence; antennae with basal joints fulvous............. texense 
2. Thorax, front and abdomen with silvery pubescence; an- 
pemiiesenrirely plac” oc v2. kane bet eee SOAs hes hanee 3 
3. Front with a strong projection; only slightly over one-half of 
dorsal portion of first abdominal segment black... .tridentatum 
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