1967] 
A ndrews — Ptinus 
193 
elytra with large preapical and prebasal streaks of white recumbent 
hairs. Total length: 2.64-3.50 mm. Greatest width (across humeral 
callosities) : 1.10-1.64 mm. 
Redescribed from cf collected at Finca Toboga, 6 mi. S., 6 mi. 
W. Canas, Guanacaste Prov., Costa Rica, Feb. 17, 1967, sweeping, 
river-bottom forest. Total length: 2.71 mm. Greatest width (across 
humeral callosities) : 1.18 mm. Head with shallow vertical impres- 
sion between eyes, vertex finely granulate, dull black; sparse recum- 
bent white hairs and stiffer, more erect black setae on front between 
eyes. Eyes moderately large, projecting beyond maximum width of 
prothorax, situated laterally, just above base of mandibles, diameter 
of each eye two-thirds distance between eyes, occasional setae between 
facets. Antennae extending to middle of elytra, stout, with fine 
pubescence and with sparse black setae as long as each segment, 
middle segments each about 1.3 times as long as wide, basal segment 
twice as long as II, segments III-X slightly longer than II and 
subequal, ultimate segment 1.9 times as long as a middle segment. 
Pronotum with greatest width and length subequal, shiny black 
with basal half reddish-brown, anterior rim with long stiff black 
setae inclined posterad, anterior half coarsely granulate and strongly 
raised forming four gibbous areas, the central two not as distinctly 
separated from each other as they are from the lateral areas, clothed 
with stiff curved black setae that converge to a central point on each 
gibbosity, lateral and posterior sides of gibbosities with stiff golden 
setae, lateral gibbosities with a few white hairs preapically, posterior 
side of gibbosities with a median strip of short white hairs; lateral 
constrictions formed by deep vertical grooves that continue forward 
on each side between the lateral and central gibbosities as shallow, 
narrower grooves; basal half glabrous with a double row of setae at 
the basal edge, a deep median key-hole shaped groove extending to 
the raised area and slightly covered by a projection of this part. 
Scutellum U-shaped and covered with short white recumbent hairs. 
Wings fully developed. Elytra 1.65 times as long as wide, sides 
parallel, humeral callosities strongly developed and raised, diameter 
of punctures at middle of elytra about one-third as great as inter- 
space width; area between preapical and prebasal streaks black, 
sutural margin, apices of elytra and basal area reddish-brown, black 
setae confined to black areas of elytra which are elsewhere clothed 
with golden setae ; inclined setae of strial punctures extending slightly 
beyond next puncture; erect setae of intervals moderately short, 
setae of odd intervals only slightly longer than setae of even inter- 
