JUBININI 39 



The pronotum is cordiform, narrowed on each side near the middle or 

 even strongly bilobed, with the marginal invagination at times toothed. In all 

 of the genera but one there is a transverse subbasal sulcus. Barrojuba lacks 

 this transverse sulcus entirely. 



The elytra have an entire or subentire sutural stria, a poorly-developed- 

 to-vestigial dorsal stria, and often a longitudinal sulcus on the elytral flank. 

 Humeri are well formed, and at times dentate. Elytral base usually has a 

 transverse carina or raised surface. The elytra are often much shorter in the 

 females than in the males of a species, and the female sex often has less well 

 developed metathoracic wings. In some species the females have the wings 

 wholly vestigial. 



This sexual difference sometimes seen in elytral size and wing development 

 is paralleled in the eyes. Thus in many species the short-elytral, reduced winged 

 females have conspicuously smaller eyes than males of the same species. 



The abdomen is elongate, laterally margined, and has six visible sternites 

 in both sexes. 



All three pairs of coxae are conical, and the trochantal-femoral articu- 

 lation is typically brachysceline, being oblique with the associated femur and 

 coxa relatively close to each other. 



The tarsi depart from the oxyteline-faronine type, being more typical of 

 the pselaphids as a whole; that is, the first segment is small, whereas the 

 second and third segments are much larger than the first. Two claws are 

 present at the end of the third tarsomere, and are either equal or slightly 

 unequal in length. 



These are more especially forest-floor mold species, and careful collecting 

 in this stratum will undoubtedly reveal many new genera and species. 



Key to the Genera 



Pronotum with a transverse subbasal sulcus 2 



No transverse pronotal sulcus BARROJUBA, new genus 



2. Antennal club large, distinct, compact and composed of from six to 



seven segments ENDYTOCERA 



Antennal club at most of five segments, usually indistinct 3 



3. Ventral surface of the head with two oblique, converging, sharply 



defined carinae 4 



Ventral surface of the head with no oblique, converging carinae .... 9 



4. Head suddenly constricted before the anterior end, and then dilated 



to form a blunt, quadrate to rhomboidal tubercle 5 



Head elongate, narrowing regularly to the anterior end, and without 

 the suddenly formed apical tubercle 6 



5. Antennae elongate, with the segments much longer than wide; pro- 



notum with two sharply-defined longitudinal sulci 



PSELAPHOMORPHUS 



Antennae very short, with the segments square to transverse; pro- 

 notum with two simple elongate depressions MACTA 



