1951] 
Straneo — American Pterostichini 
11 
shape of prothorax, differing from species to species; third 
interstice of elytra with at least three conspicuous foveae; 
ventral segments deeply grooved and with series of large 
punctures across their bases; tarsal claws not pectinate; 
onychium with setae beneath. This genus is most closely 
allied to Pseudabaris, which too has the ventral segments 
grooved and the tarsal claws not pectinate, but the new 
genus differs from Pseudabaris in having the third inter- 
stice of the elytra tri- or quadri-foveolate. 
Key to the Species of Pachyabaris 
1 (4) Sides of prothorax strongly rounded and nar- 
rowed anteriorly and posteriorly. 
2 (3) Prothorax strongly transverse, with anterior 
margin rather deeply emarginate, and with sides 
rounded to basal angles; shoulders squarer. 
darling toni n. sp. 
3 (2) Prothorax less transverse, with anterior margin 
less emarginate, and with sides evidently sub- 
sinuate before base, so that the basal angles are 
less obtuse subcordata n. sp. 
4 (1) Sides of prothorax not much rounded, nearly 
straight and parallel. 
5 (6) Striae rather strongly impressed, regular. 
striolata n. sp. 
6 (5) Striae slightly impressed or irregular; inter- 
stices nearly flat. 
7 (8) Prothorax widest before middle, its sides nearly 
straight, slightly narrowed towards base, with 
hind angles nearly square ; all dorsal elytral 
punctures near 3rd stria; size smaller (6 mm.). 
minuta n. sp. 
8 (7) Prothorax widest behind middle, its sides slight- 
ly but distinctly rounded towards base, with hind 
angles obtuse ; only anterior dorsal elytral punc- 
ture near 3rd stria ;size large (7.5 mm.) . laevis n. sp. 
