BATRISINI 219 



10. Antennal segment IV very transverse, dilated, one-half wider than 



II, the inner surface somewhat concave and notably pubescent; V of 

 same general form but wider and slightly produced on external face, 

 surface also pubescent; VI greatly expanded on external face, au- 

 riculate, twice as broad as II, the edge fringed with dense white 

 setae; VII subquadrate, narrower and not wider than II; 1.6 mm. 



SUhjlLSUS 



Antennae not as described above 11 



11. Antennal segment III much larger than I or II and swollen ; II square ; 



IV to VIII oval ; 2.2 mm inflatipes 



Antennae not as described above 12 



12. First four antennal segments simple. III and IV obconical; V to X 



progressively larger, slightly flattened and lightly, squamosely 

 pubescent; V obconical, VI subglobular, VII square, VIII slightly 



transverse; 1.7 mm platycerus 



Antennal segment V at least twice as long as III ; VI slightly shorter 

 than VIII; VII nearly as long as V, slightly clubbed in form; 

 1.8 mm articularis 



13. Head and pronotum black; elytra and abdomen chestnut red. .bicolor 

 Body uniform reddish-brown 14 



14. Abdomen with apex mucronate or pointed 15 



Abdomen with apex rounded, not mucronate. . . .sabomba new species 



15. Median depressions at base of first tergite very transverse, nearly con- 



fluent medianly; intermediate tibiae notched on the external face 



beyond the middle of their length singularis 



Median depressions at base of first tergite simply ovate and very dis- 

 tant from each other; intermediate tibiae not notched or grooved 

 on the external face articularis 



In this key singularis and bicolor have been described on the female sex 

 only, each from a single specimen. It is possible that bicolor belongs in Group 

 I and the discovery of the males in both species may change their positions. 



Arthmiu^ sabomba new species 



Holotype Male. Measurements: Head 0.368 including apex of clypeus 

 to occiput x 0.469 mm. through eyes; pronotum 0.368 x 0.368; elytra 0.55 x 

 0.76 mm.; abdomen 0.335 x 0.67 mm.; total length 1.6 mm.; greatest width 

 0.76 mm. (PI. VI). 



Reddish-brown, semishining with conspicuous semierect pubescence. Head 

 with very short, right-angled tempora about the length of an ocular facet. 

 Eyes large (0.12 x 0.067 mm. from dorsal view), composed of about 24 very 

 coarse facets; subreniform from a lateral view. Occiput with a short median 

 longitudinal carina. Vertex with two foveae; each fovea nude, separated from 

 an eye by the length of three ocular facets, deep and with a diameter of an 

 ocular facet. Vertex very transverse, with square corners, the sides slightly 



