224 NATURAL History BULLETIN. 
b8 Maxillary palpi without appendages. 
Antenne moniliform maxillary palpi minute, the basal joints 
hidden, the last two connate, together forming a globular 
club. - : - - - - CHENNIvUM, Latr, B32 
Last three joints of antenne forming aclub Last joint of maxil- 
lary palpielongate with a terminal seta. - Tyrus, Aubé. 237 
Last joint of antenne enormously enlarged, last joint of maxillary 
palpi cylindroid, rounded at tip. - + Hamorus, Aubé, 240 
a? Tarsi with a single claw, posterior coxe distant. 
Maxillary palpi excessively long, third joint small, globular, second 
and fourth pedunculate-clavate, very long. 
PsELAPHUS, dst. 243 
Maxillary palpi with the second joint tuberculate-clavate, the third 
quadrate, fourth broadly securiform. 
; PSELAPTRICHUS, Brendel. 242 
Maxillary palpi with the second joint clavate, pedunculate, the 
third triangular, the fourth long, securiform. TycHus, Leach. 2A 
a® Posterior coxe approximate. Tarsi with a single claw. Body linear 
depressed. - - - - - - - RHINOSCEPSIS, Lec. 254 
II. Antenne distant, inserted on the sides of the head, beneath short, distant, 
not porrected tubercles. 
a1 Posterior coxe distant, only one claw fully developed. 
51 Body broad transversely(cylindrical in cross section. Abdomen more or 
| Pe oe ae, 
less broadly margined. ““*P“c*+ 
c1 Abdominal margin retuse, narrow, dorsal segments unequal. Two basal 
ventrals longer, elytra narrow-shouldered very long, vertex bifoveate. 
(Bythinini.) 
d! Last palpal joint cultriform antennal club three-jointed. First antennal 
joint very long, vertex differently sculptured in the sexes. 
MACH-=RODES, Brendel. 282 
d® Last palpal joint acuminate-ovate. 
Penultimate joint of antennz small, lenticular, the last ovate. 
EUTRICHITES, Lec. 256 
Penultimate joint of antennz larger trapezoidal, the last long 
fusiform. - - - - SCALENARTHRUS, Lec. 255 
c® Abdominal margin broadly retuse the basal segments of the dorsum and 
venter much longer, tarsi with a single claw. Elytra flat, last palpal 
joint fusiform. (Bryaxinz). 
Vertex bifoveate, prothorax with lateral edge rounded, unifoveate, 
antenne ten-jointed with a three-jointed club. Body broad, 
sexual marks on the intermediate thighs, elytral lines and 
abdominal carinz long, parallel, and distant. 
DECARTHRON, Brendel. 260 
