96 
Psyche 
[September 
blunt setae in each diverging row, similarly shaped setae on the an- 
terior edge, and three or four short curved setae between the tormae. 
Mandibles (Fig. 7) slightly longer than greatest width, heavily 
sclerotized, dark brownish-black, with a single apical tooth; outer 
surface convex, with slight irregularities basally, a row of stiff 
setae paralleling the base, a somewhat elongate, mesal, preapical pit; 
inner surface convex, with a concave area mesally between apex 
and small acute tooth on the inner margin; inner margin compressed 
distal to the small tooth and more rounded proximal to it. Maxilla 
(Figs. 3, 4) : cardo somewhat rhomboid, with one long setae on 
external distal surface; stipes two times as long as broad, with long 
setae on external lateral surface; palpus with three segments, the 
first short and broad, circled apically by about eight long setae, the 
second almost twice as long as the first, with two apical setae, the 
third subequal to the second, narrowed distally, apex with tiny 
sensory setulae; galea extending just beyond apex of second segment 
of the palpus, with numerous stout curved setae proximally; lacinia 
consisting of a well sclerotized spine, a number of short setae basally 
on the internal side. Labium (Figs. 10, 11): mentum large and 
fleshy, prementum smaller, about two-thirds width of the mentum; 
on the internal surface, mentum bearing numerous spicules laterally, 
two short stiff setae anteriorly and mesally, prementum with live or 
six setae on either side, two pairs of short setae projecting between 
the palps; on the external surface, the mentum with a group of 
about six long setae on either side, the prementum bordered basally 
by a sclerotized band, with numerous long setae anteriorly; labial 
palpus with two segments, the basal low and membranous with a 
small triangular sclerotized area on the internal surface, ultimate 
article longer than the first, apex with tiny sensory setulae. Preanal 
sclerite (Fig. 6) small, V or U-shaped, with arms asymetrically de- 
veloped, enclosing only the very anterior end of the anal cushion. 
Spiracles (Fig. 2) annular with a single spout, thoracic spiracles 1.5 
EXPLANATION OF PLATE 29 
Ptinus cosiaricensis n. sp. 
Fig. 12. Pronotum, dorsal view, stippling of surface structure and not 
indicating setation (scale .31 mm.). Fig. 13. Genitalia, holotype $, dorsal 
view, basal piece removed, setae indicated only for right lateral lobe 
(scale .13 mm.). Fig. 14. Genitalia, holotype $, ventral view (scale .13 
mm.). 
Ptinus latefasciatus Gorham 
Fig. 15. Male genitalia, dorsal view, basal piece removed, setae indicated 
only for right lateral lobe (scale .13 mm.). Fig. 16. Male genitalia, ventral 
view (scale .13 mm.). 
