104 
Psyche 
[September 
Tribe Cerapachyini Forel 
Genus Eusphinctus Emery 
Diameter greatest at the sixth abdominal somite decreasing grad- 
ually toward the anterior end (except for a slight enlargement of 
meso- and metathorax in mature larvae) and more abruptly toward 
the posterior end. No leg vestiges. Hairs rather numerous, uni- 
formly distributed, short and bifid. Cranium about as long as its 
greatest breadth ; broad above, narrowed below. Head hairs simple 
(except one or two pairs which are bifid) and minute. Labrum small, 
not covering the bases and tips of mandibles ; about twice as broad 
as long; slightly narrowed distally; a few sensilla on the anterior 
surface near the distal border; central cluster of sensilla on the 
posterior surface. Maxillary palp a short stout peg. Labium with 
a few spinules. 
Eusphinctus steinheili Forel. — Figure 1. Elongate, slender, sub- 
cylindrical, arcuate (i.e., rather evenly curved ventrally). Diameter 
greatest at the sixth abdominal somite ; decreasing gradually toward 
the anterior end (except in mature specimens in which there is a 
slight enlargement of the meso- and metathorax) and more abruptly 
toward the posterior end which is round-pointed. Anus ventral. 
Anterior portion of prothorax constricted rather abruptly to form 
a sort of wedge-shaped neck, which is naked except for a few ventral 
hairs. Ten differentiated somites. No leg vestiges. Spiracles small. 
Body uniformly and rather densely covered with short bifid hairs 
about 0.04 mm. long. Intersomitic membranes and anterodorsal sur- 
face of prothorax naked. Head small. Cranium about as long as 
its greatest breadth ; broad above, narrowed below ; occipital border 
slightly curved. Mouth parts large and prominent. Head hairs few 
and scattered; one or two pairs bifid, the rest simple; minute (length 
0.018 - 0.028mm.). Antennae of moderate size; with two or three 
sensilla. Labrum a small thick flap, about twice as broad as long, 
slightly narrowed distally; a few sensilla on the anterior surface 
near the distal border; a central cluster of six sensilla on the pos- 
terior surface. Mandibles rather feebly sclerotized; long and slen- 
der; base moderately stout; distal two-thirds narrow and thin, tap- 
ering to an acute apex which is slightly curved backward and 
medially; distal half of medial border serrate with five or six den- 
ticles. Maxillae lobose, round-pointed, rather long; palp a short 
stout projection bearing five or six sensilla; galea a slender truncate 
cone bearing a sensillum on the apex. Labium subhemispherical; 
