22 Trans. Acad. Sci. of St. Louis. 
modification of this fold in the present subtribe is accom- 
panied by so many peculiarities of habitus or specialized 
structure as to indicate its really important nature from a 
generic standpoint, and I have therefore used it as one of the 
primary criteria both here and in the Lathrobia, where it 
apparently loses none of its significance. In the Cryptobia 
the fold is present as a rule and its absence is the excepticn, 
while the reverse is the case in the Lathrobia, there being 
more species in the latter without than with this plication. 
The anteriorly flexile antennae, with greatly elongate basal 
joint, and the undilated anterior tarsi, are the only important 
characters distinguishing the Cryptobia from the Lathrobia, 
the large conical glabrous fourth palpal joint being common 
to the two, butin the table of subtribal groups it is necessary 
for convenience to separate them by a few subtribes having 
the fourth joint completely different in form, being com- 
pressed and finely pubescent. This difficulty of course arises 
from the practical necessities of a lineal succession in the 
grouping. ‘The genera represented by material in my cabinet 
may be defined as follows : — 
Gular sutures separated; maxillary palpi coarsely and very sparsely setu- 
lose; pleural fold when present never united with the side margin 
posteriorly .....-+see. Sr eee eeccseseees 2 
Gular sutures united throughout their length from the small triangular post- 
mental piece; third palpal joint finely and closely pubescent; pleural 
fold gradually becoming fused with and forming part of the side margin 
POSTETIOLLY .2-2 ccc ccccccccccceveseccccsccees Coed ccdcceGeeeceteoess «12 
2 — Elytra with a pleural fold near the side margin........ssceeesevcoeee 8 
Elytra without trace of a pleural fold. .ceee coesccccveseccccccccccsesece F 
3 — Pleural fold entire, extending from the humeri to the outer angle of the 
SIVELA 10's hace bel cugeonsh + iy0 bee ev Gus a ces cease ee 
Pleural fold incomplete. ......eccceee-cece, tavbéuwechns és eRen ieakberene 0 
4— Neck entirely unconstricted on the upper and Jower surface, feebly 
constricted at the sides, very broad and but slightly narrower than the 
widest part of head, the latter elongate and rather depressed, but 
little narrowed before the eyes which are moderate in size and ant+rior 
in position; two post-ocular setigerous punctures — characterizing 
most of the genera — wholly obsolete; Jabrum short, edentate, feebly 
and biobliquely truncate, with a small median sinus; lobes of the ligula 
large, obtriangular, apparently connate throughout their length, mem- 
branous, the basal part corneous; mentum large, trapezoidal, with more 
than apical half coriaceous, unimpressed at base; guiar sutures more 
widely separated than usual, straight and only very slightly converging 
