454 ZOOLOGICAL LITERATURE. 
1. Antennaa serrated from the fourth joint* 
a. Prosternum and sternum of normal form. 
* Prothorax with two long lateral keels. 
ct. Head hollow between the eyes, with a narrow and deep me- 
dian fuiTow 1. Ethon (L. & G.). 
/3. Head nearly flat between the eyes, not furnished with a deep 
, andnarrowmedian furrow 2. CissEis (L. & G.). 
t Prothorax with two short lateral keels, or none j lateral margins 
crenellated by a row of points, 
a. Head large j antennae slender. 
3. CORJEBUS (L. & G.). 
/3. Head small j antennae robust. 
4. Eupristocerus ^ (g. n.). 
§ Prothorax sometimes denticulated on the margins, but never 
crenellated by a row of points. 
a. First segment of abdomen narrowly channelled j head not 
tubercular 6. Evimantius^ (g"- n.). 
/3. First segment of abdomen narrowly channelled j head bi- 
tubercular 6 . Amorphosomus (L. & G.). 
h. Sternum much eleyated j prosternum lower, vertically truncated 
in front, with the head resting on the truncature. 
7. Amorphosternus ^ (g. n.). 
2. Ahtenuae serrated from the fifth joint (except in a species of 
Toxoscelus). 
a. Anterior and intermediate tibiae strongly arched at base. 
8. Toxoscelus (g. 11.). 
b. Tibiae of normal form. 
* Sternal cavity formed chiefly by the met'asternum j branches 
of mesosternum very small. 
a. Head hollow or flat, not deeply sulcated in the middle. 
a. El}Tra never with more than one ridge. 
** Body and elytra strongly squamose or villose. 
9. Discoderes (Chevr.). 
tt Body and elytra smooth, or nearly so. 
10. CORYDON ^ (g. n.). 
h. Elytra with two or four ridges. 
11. Alissoderus® (g. n.) 
)3. Head with a narrow and deep furrow, which is divided in 
front 12. Stenogaster (Sol.). 
t Sternal cavity formed only by the mesosternum, at least 
laterally. 
a. Prosternum separated from the metasternum by the branches 
of the mesosternum, which unite posteriorly. 
13. SYNECnOCERA ® (g. 11.). 
\ Type B. ignarn^s (Fab.). ^ Type E, rufopictus (Laf.). 
® Type A. cucullatus (Dej.). 
^ Types C. nitidicollk (Go^) and C. striatus (Gory). 
® Types A. Uucogadei' (Wied) and A. cornutum (Thunb.). 
® Type S. doplana (Gory). 
