2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



Key to Species 



1. Pronotal ridges widely bare, shining and noticeably punctate (see pi. 1) ; 



Mexico, El Salvador, Guatemala C islasi, new species 



Pronotal ridges not widely bare, shining or noticeably punctate 2 



2. Anterior longitudinal pronotal ridges narrow, sharply carinate; Bolivia. 



C. cartwrighti, new species 

 All pronotal ridges low, rounded; Mexico C. intertribalis Islas 



Carttvrightia islasi, new species 



Plate 1 



Holotype male. — Length 3.45 mm, width 1.5 mm. Elongate, 

 subparallel, generally dark reddish brown with areas of grayish golden- 

 brown argillaceous coating showing on head, pronotum, tips of elytra 

 and underside. Clypeus with double anterior edge, upper and lower 

 margins separated by fine narrow furrow extending from gena to gena, 

 lower margin with median triangular tooth directed downward ; upper 

 margin very narrowly recurved, moderately deeply emarginate be- 

 tween low triangular teeth, laterally nearly straight to genal suture; 

 gena arcuate downward with sharp posterior angle; clypeal-frontal 

 suture distinct from gena to base; discal area convex, slightly concave 

 each side, surface shining brown, minutely alutaceous, without argil- 

 laceous coating, punctures shallow, fine to moderate, separated by 

 about their diameter, group of slightly coarser punctures on each side 

 near frontal suture; posterior margin of clypeus elevated above frontal- 

 basal area and downward on each side to gena; fine carina-like margin 

 following curvature of eye with furrow in front of it; basal area behind 

 clypeus dull, minutely alutaceous. 



Pronotum wider in front, anterior edge narrowly membranous, 

 surface generally shining, dark brown, with five depressed areas and 

 posterior margin showing argillaceous coating, five areas separated 

 and surrounded by low rounded ridges; two large anterior areas 

 separated by longitudinal median ridge, replaced suddenly by narrow 

 median depressed area of equal width over posterior half to base; 

 two sinuate lateral depressed areas extending diagonally backward 

 from anterior angles to middle of median basal area (pi. 1) ; median 

 basal area with deep, sharply incised median fine and diagonal areas 

 with similar sinuate incised line; deep fine also visible from side along 

 posterior angle. Shiny ridges quite closely finely punctate, slightly 

 finer and closer along anterior pronotal margin; two anterior depres- 

 sions with row of close coarse punctures in front and group of very 

 close, coarse punctures posteriorly. Base of pronotum very weakly 

 angulate at middle. 



Scutellum elongate, parallel, three times as long as wide. Elytra 

 length 2.3 mm, width 1.5 mm. Humeri distinctly dentate. Each 



