164 NEOTROPICAL PSELAPHIDAE 



surface of head with a median longitudinal carina, eleven-segmented antennae, 

 first two tergites distinctly margined, and the distal segment of maxillary palpi 

 provided with a tooth on the external face separate the two species from other 

 neotropical genera in this tribe. 



The two species may be quickly separated as follows (PI. VII, 4, 5) : 

 Distal (fourth) segment of maxillary palpi with a minute, acute tooth 



on external face at apical third exdsula 



Distal (fourth) segment of maxillary palpi with a minute, rounded 

 tubercle on external face at basal third. . . .dentipalpa new species 



Berdura dentipalpa new species 



Type. Measurements: head 0.20 x 0.26 mm.; antennae 0.335 mm.; pro- 

 notum 0.23 x 0.30 mm.; elytra 0.40 x 0.44 mm.; abdomen 0.15 x 0.43 mm.; total 

 length 1.0 mm.; greatest width 0.44 mm. (PI. VII) 



Body subglobular, shining, reddish-brown; integument lightly punctulate, 

 with short pubescence (0.017 to 0.022 mm.). Eyes below level of vertex, sub- 

 circular from lateral view, of twenty-eight coarse facets, 0.067 mm. through long 

 diameter, longer than tempora; tempora slightly convergent to occiput; occiput 

 truncate and slightly swollen to level of vertex; vertex slightly, evenly convex, 

 with two foveae on a line through middle of the eyes ; vertexal foveae small but 

 distinct, equal in diameter to an eye facet, not connected by any sulcus ; front 

 angularly produced but declivous between antennal bases, no elevated frontal 

 rim or margin ; epistome unmodified, pubescent. Ventral surface of head and ven- 

 tral surface of cervicum finely alutaceous. Dorsal surface of cervicum glabrous. 

 Ventral surface of head medianly concave, and with stout carinae as follows: 

 (1) a median, longitudinal, laminoid carina; (2) a strong, biarcuate lateral 

 carina each side from base of maxilla to posterior area of head; (3) a short, 

 strong, obliquely vertical carina which arises at the middle of the ventral margin 

 of each eye (PI. VII, 12) and drops in a straight line to join the lateral carina 

 at its most external arc, quite different to the homologous carina of Xybarida 

 nasicola in its course. 



Maxillary palpi four-segmented ; first segment minute and obconical ; sec- 

 ond elongate, arcuate, basally slender and only moderately inflated apically; 

 third short, subtriangular; fourth longer than second and wider than third, 

 conical-ovate in outline, with the base rounded and apex very rapidly acute 

 and bearing a long, obtuse, obliquely inserted palpal cone. The external face of 

 this distal segment bears a small, rounded tubercle as basal third (PI. VII, 4). 



Antennae eleven-segmented, rather short, widely separated at bases; seg- 

 ment I arcuate cylindrical; II ovate, as long and as wide as first from dorsal 

 view, but shorter from lateral view due to the overhang of the antennal acetab- 

 ulum; III obconical, much smaller than second; IV to VIII subequal in size, 

 submoniliform, small and closely articulated; IX transverse, as long as eighth 

 but wider; X wider than ninth and slightly longer; XI relatively large, twice as 

 wide as tenth and nearly as long as fifth to tenth segments inclusive united, very 



