92 
Psyche 
[June 
slightly projecting, single-segmented labial palpi. Maxillary palpi 
not seen in undissected mouth-parts, presumably reduced to a single 
small segment. Antennae long, 12-segmented ; scape and pedicel 
subequal in length, each about twice as long as broad ; flagellum 
filiform, only very slightly thicker at apex than at base. Compound 
eyes large and strongly convex, placed near the front of the sides 
and occupying about half the sides. Ocelli prominent, raised, sur- 
rounding a prominent indentation in the vertex. 
Truncus well-developed, mesonotum with weak parapsidal furrows 
and notauli, the latter incomplete, not or at least not distinctly fused 
behind. Pronotum and propodeum unarmed, rounded; inferior pro- 
podeal plates present. 
Wings long, densely microtrichiate ; apical margin of fore wing and 
apical and hind margins of hind wing with a wide fringe of fine 
hairs. 
Legs slender, long; tarsal claws simple, short, fine; tibiae of mid- 
dle and hind legs without apical spurs. 
Genitalia (Figs. 8-10) formed on the same plan as Strumigenys ; 
aedeagus valves subtruncate apically, cuspis of volsella slender; mesal 
face of paramere broadly excavated opposite volsella. Hypopygium 
elongate-triangular, with concave sides tapering to a narrowly 
rounded apex. 
Pilosity abundant and widely distributed, consisting of short, fine 
soft brown hairs, mostly decumbent, but erect on propodeum. Color 
dark brown to probably blackish in fully-colored specimens; ap- 
pendages pale. 
Larva: To be described separately by G. C. and J. Wheeler. 
Distribution, Ecology and Behavior 
As now known from definite records, Acanthognathus ranges 
from Honduras in the north to Rio Grande do Sul in the south. 
It seems very likely that its range reaches into northeastern Argentina 
and to Bolivia., and it would not be surprising to find the genus in 
southern Mexico. Two of the new species described here extend the 
records into the Amazonian heartland and to Trans-Andean 
Colombia, while a new collection of A. ocellatus is the first for the 
genus from Trinidad. 
The great increase in collections of Acanthognathus in recent years 
is due in large part to the rise in use of the Berlese funnel and similar 
methods of extraction of forest soil and litter, as well as to more 
intensive collecting in rotting twigs and similar microhabitats on the 
