1986] Porter — Thyreodon from Costa Rica 135 
off and not receding or slightly expanded behind eyes. Occipital 
carina: bent mesad well above base of mandible, not approaching 
hypostomal carina. Clypeus: with abundant, commingled small to 
large punctures, most of which are separated by conspicuous 
smooth interspaces. Lateral ocellus: 0.77-0.90 as long as OOL. 
Mesoscutum: notauli not crested near base, broad and shallow, 
often (not always) becoming much weaker apicad, traceable 0.8 
length of mesoscutum, scarcely convergent rearward; surface shin- 
ing with numerous, small to medium sized, sharp punctures that are 
mostly separated by at least their diameters and sometimes in gen- 
eral by more than their diameters. Scutellum: high, convex, and 
shining with mostly subadjacent to adjacent small to medium sized, 
sharp punctures and with lateral carinae developed only at its base. 
Mesopleuron: sternaulus faint but usually percurrent; surface shin- 
ing and with abundant, medium sized to small, sharp punctures that 
are mostly subadjacent to a little reticulately adjacent on lower 0.5 
but which average slightly sparser on upper 0.5; speculum smooth 
and polished. Lower metapleuron: dully shining with small to 
medium sized, sharp, subadjacent punctures and some coarse periph- 
eral wrinkling. Propodeum: swollen, contours rounded, the dorsal, 
lateral, and apical faces not sharply discrete; basal face shining with 
long and dense appressed grayish setae, its median field gently 
swollen and with the punctures very dense and tiny, its lateral field 
more shining with larger and more widely spaced punctures that 
expose much polished integument basad; lateral face with long and 
dense appressed setae and sometimes with variably developed mod- 
erately strong and mostly longitudinal wrinkles, as well as always 
with abundant medium sized, mostly subadjacent to adjacent (or 
sometimes extensively adjacent) punctures; apical face in compari- 
son to rest of propodeum at least in large part contrastingly smooth 
and brilliantly polished with tiny punctures that emit long but little 
overlapping setae and often with many long and oblique, well 
separated and rather fine wrinkles. 
Male. Color: shows same range of variation as noted for 
female and, in addition, is marked with dull to bright yellow as 
follows: usually on basal 20-25 flagellomeres below (becoming 
duller distad); with a small to large ventral blotch on scape; on as 
little as 0.5 to as much as almost all of face (and sometimes also on 
