1971 ] Barr — Trechoblemus 145 
tains or caves, Mexico to Costa Rica and possibly 
Panama Paratrechus Jeannel 
6(4) . Eyes normal 7 
Eyes absent or rudimentary; inhabitants of caves or of deep 
soil in mountainous regions 9 
7(6). Color black or piceous; glabrous, polished integument; 
range: most of Canada, United States including Alaska 
(absent from southern Great Plains and Altantic and 
Gulf coastal plains), central highlands of Mexico 
Trechus Clairville 
Color more or less testaceous, integument densely pubescent 
8 
8(7). Darker, with prominent, blue-black fascia across elytra; 
pronotum cordiform; eyes very convex; longitudinal 
striae disappearing before apex; apical recurrent groove 
oblique to suture; eastern Canada and New England 
Lasiotrechus Ganglbauer 
Paler, elytral fascia nebulous or absent; pronotum trans- 
verse-subquadrate; eyes feebly convex; at least inner 
three longitudinal striae complete; apical recurrent 
groove subparallel to suture, conspicuously joining third 
stria; northwest Oregon . ... Trechoblemus Ganglbauer 
9(6). Mentum separated from submentum by distinct suture; 
submentum with row of four long (prebasilar) setae; 
basolateral margins of pronotum with two or three 
prominent teeth; known only from caves in vicinity of 
St. Louis and Ste. Genevieve, Missouri 
X enotrechus Barr and Krekeler 
Mentum fused to submentum; submentum with transverse 
row of six to twelve setae; basolateral margins of pro- 
notum without teeth; range: east of Mississippi River 
10 
10(9). Head with one pair of supraorbital setae; form elongate, 
subconvex, elytron without anterior apical puncture 
(+ +o); last segment of maxillary palp shorter than 
penultimate segment; length 6-7 mm.; western Penny- 
royal plateau of Kentucky Neaphaenops Jeannel 
Head with two pairs of supraorbital setae (rarely more 
than two) ; last segment of maxillary palp subequal in 
length to penultimate segment 1 1 
11 (10). Anterior tibia subglabrous on external face; anterior apical 
puncture of elytron very small, not setigerous ( + +0) ; 
