1972] 
Kurczewski & Evans — Bothynostethus 
99 
each bearing three minute sensilla. Head setae sparse and short, the 
longest 40 fi; clypeus with few setae. 
M'outhparts. Labrum (Fig. 10) truncate apically, bearing 8 
setae across disc and 16 across apical margin, the margin with some 
minute, inconspicuous sensilla and rather weakly bristly; epipharynx 
strongly spinulose medially, with smaller and sparser spinules later- 
ally; epipharyngeal sensory areas each with four sensilla. Mandibles 
(Figs. 11, 12) slightly more than twice as long as their basal width, 
with three teeth on inner margin in nearly same plane; base with 
a single seta; upper surface roughened in area of teeth. Maxilla 
(Fig. 13) protruding, rounded, without an evident lobe on inner 
margin, densely spinulose along mesal margin; palpus about 80 ji 
long, galea more slender, slightly more than half as long as palpus. 
Hypopharynx very densely spinulose. Labium (Fig. 14) with pre- 
mentum densely and extensively spinulose; palpi about 60 /i long, 
slightly curved, much exceeded by spinnerets. 
Comments on larval characters. In the artificial key to genera 
of Sphecidae presented by Evans (1959, p. 1 6 1 ) , the larva of 
Bothynostethus runs to Entomognathus , a genus reconsidered in the 
paper that follows (Miller and Kurczewski, 1972). In the table 
of subfamily characters (ibid, p. 168) it runs to the couplet sepa- 
rating the Larrinae and Crabroninae, agreeing with the Crabroninae 
except in having accessory finger-like lobes on the prothorax as in 
many Larrinae. Distinctly crabronine features of Bothynostethus 
larvae are as follows: spiracular atrium weakly sculptured and 
opening into subatrium unarmed; mandibles slender and with teeth 
in about the same plane; mesal margin of maxilla not lobed. Very 
similar 3-toothed mandibles occur in Lindenius pygmaeus (Rossi) 
(Grandi, 1928) and similar but 4-toothed mandibles are found in 
L. tylotis Court and R. Bohart and in other crabronine genera such 
as Crossocerus and Entomognathus (Evans, 1959). In most Cra- 
broninae the spinules on the labium occur in two separate patches, 
but Bothynostethus is like Entomognathus in having the entire oral 
surface clothed with spinules. In several other features the larvae 
of these two genera are very similar: body setae and spinules are 
similar in size and distribution; the labrum is similarly shaped and 
with a similar distribution of setae and spinules; the form of the 
palpi, galeae, and spinnerets is virtually the same; and the spinules 
on the hypopharynx, maxillae, and labium are similarly dense and 
abundant. Entomognathus has no lobes on the prothorax, more head 
setae, and, as mentioned above, four-toothed mandibles. [This com- 
