1978] Thayer & Newton — Revision of Genus Glypholoma 33 
scattered long setae. Apical antennal segments simple, without 
apical gutters or invaginations (see figs. 9, 10), with fairly dense 
short setae in addition to scattered long setae (see fig. 10, compare 
basal segments, fig. 7). 
Labrum transverse, narrowly rectangular to slightly bilobed 
anteriorly, ventrally as in fig. 8. Mandible (of pustuliferum and 
rotundulum, at least) without preapical teeth, with a medial setose 
area about midway from base to apex and a well-developed molar 
lobe (see figs. 8, 14-17). Molar lobe apparently articulating dorsally 
and ventrally with mediobasal area of mandible proper. Maxilla 
more or less as in fig. 13, the palp generally filiform with fourth 
(apical) segment 2.5 to 5 times as long as third, a group of sensilla as 
in fig. 1 1 on its dorsolateral surface near the base. Hypopharynx (of 
pustuliferum and rotundulum, at least) about as in fig. 12. Labium 
apparently bilobed, with three-segmented palps arising from separ- 
ate palpigers; segments of palp subequal in length and width (see 
fig. 7, also Newton, 1975, fig. 3). Mentum large and trapezoidal; 
gular sutures separate, their minimum separation 0.12 to 0.18 times 
the head width (see fig. 7). 
Pronotum 1.5 to 1.8 times as wide as long, about 0.35 times as 
long as elytra; widest point variable, from posterior corners to just 
behind middle; with complete sharp lateral margins, explanate in at 
least basal half; lacking lateral foveae with internal pillars. Post- 
coxal process of pronotum acutely triangular, apparently a bar to 
coxal flexation (see figs. 18, 20). Prosternum with or without 
median longitudinal keel; prosternal intercoxal process extending 
one-half to two-thirds of the (antero-posterior) length of the 
procoxae. Procoxa with external longitudinal keel and mesal 
transverse articulating groove (see figs. 18-21). Protrochantin ex- 
posed, shorter than postcoxal pronotal process, dorsal pleural-coxal 
(trochantinal-coxal) articulation visible, pleural-sternal articulation 
present (the last possibly absent in tenuicorne), as in fig. 20. 
Mesosternum 0.5 to 0.6 times as long as metasternum, with a 
nearly acute process (except in rotundulum, see figs. 35, 37) 
extending between the mesocoxae for four to seven tenths of their 
length (figs. 34, 36). Mesosternal process not medially longitudinally 
carinate. Anterior part of mesosternum with cavities for reception 
of procoxae 0.4 to 0.75 times as long as whole mesosternum. 
