124 NEOTROPICAL PSELAPHIDAE 



6(5). Base of each elytron with two foveae (PI. XVIII, 3) 



DECARTHRON 



Base of each elytron with three foveae ITAMUS 



7(4). Antennae ten-segmented 8 



Antennae eleven-segmented 9 



8(7). Fourth (last) segment of maxillary palpi regularly ovoidal with 



subacute apex ECTOPOCERUS 



Fourth (last) segment of maxillary palpi with the internal face 

 either slightly concave or straight, and the external face con- 

 vex, the apex blunt DRASINUS 



9(7). Maxillary palpi with the third (penultimate) segment lentic- 

 ular, with the long axis vertical, the external face concave and 



bearing spongy pubescence BYTHINOGASTER 



Maxillary palpi with the third segment not so formed 10 



10 ( 9 ) . Abdomen with at least the first two tergites margined, the 



margin may be narrow or wide, but is present 11 



Abdomen with the tergites laterally limited by a single, simple 

 carina GLOBA 



11 (10). Fourth (last) segment of maxillary palpi with a tooth or tu- 



bercle on the external face, this tooth may be acute or blunt, 



and may be at apical third or basal third (PL VII) 



BERDURA 



Fourth segment of maxillary palpi not so formed 12 



12 (11). Middle coxae contiguous, the mesostemal and metasternal 



processes not visible between them 13 



Middle coxae either subcontiguous (in which case the meso- 

 stemum is visible between them as an acutely pointed, narrow 

 lamina), or distant (in which case the mesosternum is visible 

 between them as a more or less flattened plate with usually 

 a truncate end which is in contact with a flattened plate ex- 

 tending anteriorly from the metasternum) 18 



13 (12) . Pronotum with the disc simply convex 14 



Pronotum with the disc distinctly longitudinally gibbous or with 

 a median longitudinal carina, or with the disc deeply and 

 complexly excavated 17 



14 (13). Lateral pronotal foveae relatively much larger than the median 



subbasal pronotal fovea 15 



Lateral pronotal foveae absent or vestigial, never larger than 



the punctiform median subbasal fovea if present 



PHOBERUS 



15 (14). Elytra with a discal stria of variable length, but distinct 16 



Elytra with no dorsal stria or striaform depression on disc. . . 

 EREMOMUS 



16 (15). Epistomal region simple, or slightly expanded 



REICHENBACHIA 



