44 NEOTROPICAL PSELAPHIDAE 



having the j&rst tergite equal to or slightly shorter than the second, and this 

 does not check with generic diagnosis (Raffray, 1908, p. 30) . Distance between 

 antennal bases and the consequent narrowing of front is a much more constant 

 and reliable character in separating these two genera. 



Sebaga notonoda new species 



Length: 1.71 mm. Greatest width: 0.59 mm. Color as in raffrayi, with the 

 body pubescence shorter, average length of setae 0.054 to 0.067 mm. 



Head rounded-triangular, broadest just posterior to the eyes, the eyes 

 medium in size, composed of about 25 very coarse facets. Occiput less sinuate 

 posteriorly than in raffrayi, with the occipital notch medianly much broader 

 and less pronounced. Vertexal foveae more anteriad in position than in rafjrayi, 

 placed on a line opposite the second tier of facets of the eyes, and instead of 

 being equidistant between the occiput and antennal insertions, the vertexal 

 foveae are three-fifths of this distance from the occiput. Antennae with seg- 

 ments I and II equal in length and width; I ovate; II truncate apically; III 

 and IV of the same length; VII a little longer than VI; VI and VII sub- 

 rhomboidal, slightly produced for entire anterior face; VIII as long and as 

 wide as IX; XI one and one-half times as long as X; otherwise as in rafjrayi. 

 Ventral surface of head with the typical V-shaped carinal pattern, but with 

 the V shorter than in rafjrayi, the two arms of the V and the posterior margin 

 of the mentum forming an equilateral triangle; these carinae converging 

 posterior of the V and enclosing an elongat€-oval gular fovea. Head otherwise 

 as in rafjrayi. 



Pronotum with the biarcuate transverse sulcus much deeper than in 

 rajjrayi; posterior angles of the anterior rounded-triangular half of the pro- 

 notum not evenly rounded as in rafjrayi but posteriorly extended at the ex- 

 ternal-posterior angles to form a short cusp or tooth. Posterior to the trans- 

 verse sulcus the sides are sub-dentate and then narrow obliquely in basal 

 fifth. Lateral foveae in the transverse sulcus are vestigial, being represented 

 by an indented, darkened area on the sulcal floor, near but not at the edge 

 of the sulcus. Disc of the pronotum with the antebasal platform very different 

 from that described for rajjrayi. The antebasal platform, instead of being al- 

 most flush with the discal curve of the pronotum and more or less enclosed 

 in the transverse sulcus, projects from the anterior median wall of the sulcus, 

 and consequently the top of the platform is oblique with reference to the pro- 

 notal diac, and is parallel with the sharply sloping wall of the sulcus. Antebasal 

 platform (PI. XV, 10) twice as wide as long, slightly dumb-bell shaped, with 

 the median narrower part slightly sulcate; platform edges defined but not 

 projecting over the column of the platform, that is, the top and column of 

 platform not well differentiated; surface of platform slightly roughened, 

 slightly convex. Each latero-basal angle of pronotum with an obscure, tri- 

 angular fovea. Pronotum otherwise as in rafjrayi. 



