1970] 
Barr — Platynella 
21 1 
districtus Casey. A. montezumae is closely similar to A. districtus , 
and should be transferred to Platynella. In the present unsatisfactory 
state of classification of Mexican and Central American agonines, 
I believe it is best to leave Platynella a subgenus of Agonum , in the 
widest sense. 
Agonum Bonelli 
Subgenus Platynella Casey 
Casey, 1920, p. 23; no type designated, Anchomenus ( Platynella ) districtus 
Casey herewith designated. 
Bolwaridius Straneo, 1957, p. 81; type species, B. tolucensis Straneo, by 
original designation. NEW SYNONYMY. 
Description : Length 9-14 mm; color piceous or dark purplish 
piceous to ferruginous; form subconvex, legs long and slender; 
microsculpture of head isodiametric, of pronotum transverse, of elytra, 
which are dull shining, intensely isodiametric, subgranular. Eyes 
small to moderate, tempora distinctively inflated behind eyes. Pro- 
notum with sides feebly rounded in apical 1/4 to 1/3, then oblique 
and very feebly sinuate to the obtuse, sometimes minutely denticulate 
hind angles, margins moderately to strongly reflexed; pronotum 3/4 
as long as wide to nearly as long as wide; base trisinuate, rounded 
behind the angles; anterior angles moderate to very prominent; with 
two pairs of slender, fragile setae in pronotum margin, probably 
always present in life but apparently easily broken off in dried speci- 
mens. Elytra with apices briefly and individually produced, rounded, 
or bluntly angular; umbilicate series on 8th stria with about 15-17 
punctures; usually with four minute, non-setiferous discal punctures 
on 3rd interval, the first two touching either the 3rd or 2nd stria, 
the posterior two touching the 2nd stria, first two absent in one species 
(tolucense) . Antenna rather short, with outer seven segments grad- 
ually and progressively compressed, dense pubescence beginning on 
apical 3/4 of fourth segment. Tarsi with 4th segment not lobed on 
any of the legs, glabrous above, setose beneath, including 5th segment 
of metatarsus; tarsi strigose or smooth above, according to species 
(strigose in three of the seven known species). Mentum tooth prom- 
inent, truncate at the tip. Base of prosternum not sharply truncate. 
Metathoracic wings vestigial, more or less micropterous. Aedeagus 
with small basal bulb and small proximal orifice, median lobe arcuate 
and swollen, apex pointed and briefly attenuate, distal orifice large 
and opening asymmetrically to the left, the complexly folded internal 
sac protruding; internal sac with numerous small spines but without 
