18 ENTOMOLOGICAL NEWS [Jan., ’20 
half except for a median blackish spot; mandibles black and polished, 
heavier than in Labena grallator Say, their teeth poorly developed, rudi- 
mentary and rounded, greatest width of under side of mandibles : greatest 
length of mandibles :: 8 : 14; outer surface of mandibles triangular in 
outline, the height of the triangle : the length : : 6 : 14; labrum visible 
between the mandibles and the clypeus, cheeks yellow, rectangular be- 
neath and back of the eye, more highly developed than in Megarhyssa 
lunatrix Fabricius, occipital carina represented only by a band-like carina 
on the lower third of the cheeks and extending to the gular carina which 
it meets almost at the insertion of the mandibles; at the lower posterior 
angle of the cheek half way between these two carinae is a broad, flat- 
tened, rounded tooth; palpi similar to the palpi in Megarhyssa lunatrix 
Fabricius; occiput black and reddish; antennae much the same as in 
Megarhyssa lunatrix F., except in the terminal joint which in this species 
is shaped more like the end joint of the index finger than in M. lunatrix F.; 
antennae mostly dark reddish, the apical fourth mostly yellowish, con- 
trasting with the darker tip and darker basal three-fourths, third, fourth 
and fifth joints of the flagel blackish above. 
Pronotum mostly reddish, its sides partly yellow, partly black, its 
hind margin straight, a tooth near its lateral margin and half-way be- 
tween the anterior margin and the tegulae, directed outward and back- 
ward; dorsulum reddish except for a yellow anterior margin, a median, 
longitudinal yellow mark and a posterior black mark, uniformly, coarsely 
and transversely ribbed, notauli completely wanting, mesopleurae mostly 
yellow, anterior margin and prepectus black, a reddish and black mark 
on each posterior, upper fourth, scutel yellow with its posterior margin 
black, with three transverse carinae, the first and second arcuate, the 
third straight; metanotum yellow, with a reddish and black posterior 
margin and with an almost semilunar area bounded by an arcuate ridge 
anteriorly and a straight ridge posteriorly, tegulae oblong, yellowish and 
brownish stramineous. 
Wings almost colorless except as follows: apical eighth of wings mostly 
covered with an almost circular dark brownish macula; venation much as 
in Megarhyssa lunatrix F., notably differing in the absence of a ramellus, 
in the recurrent vein being received by the areolet before but near the 
middle and in the submedian vein joining the nervulus at the junction of 
its upper third with its middle third, nervellus not interstitial with the 
transverse cubitus, veins blackish, except for the costa which is dark 
stramineous and concolorous with the stigma. 
Legs short, mid and hind tarsi hardly longer than their tibiae, fore tarsi 
nearly twice as long as their tibiae, legs mostly yellowish, tarsi dark with 
yellowish tips except for the mid and hind onychii which are black or 
blackish like their claws, hind coxae, trochanters femora and tibiae red- 
dish, hind tarsi with the basal joint mostly blackish. 
Metapleurae almost square, yellow, reddish and black along the anterior 
edge; propodeum with its upper aspect mostly reddish on the basal half 
