ICHNEUMON-FLIES OF AMERICA I 1. METOPIENAE 135 



9. Cubus, new genus 



Figure 170, b 



Front wing about 8.5 mm. long; body punctation fine and weak; 

 face and clypeus evenly convex, tbe face continued dorsally between 

 antennal sockets as a triangle witb an acuminate point, and continued 

 back between the antennae as a high lamella, the lamella with a deep 

 longitudinal groove in its dorsal edge, in profile the edge of the lamella 

 dorsally semicircular; temple long, strongly oblique, weakly concave 

 or flat; head in profile concave between hind ocellus and occipital 

 carina; occipital carina rather close to foramen magnum, complete, 

 strong, and somewhat reflexed; cheek about 0.6 as long as basal 

 width of mandible; mandible rather flat, tapered apically, the lower 

 tooth much shorter and smaller than the upper tooth; labrum dis- 

 tinctly projecting; flagellum moderately slender, weakly swollen medi- 

 ally; upper margin of pronotum heav}^, rounded; propleurum cubi- 

 cally swollen; scutellum rather flat, without a lateral carina ; areolet 

 absent; nervulus postfurcal by about 0.4 its length; nervellus broken 

 near its middle; prepectal carina strong, complete, its dorsal end at 

 front end of subtegular ridge; sternaulus a short broad shallow groove; 

 metapleurum smooth, polished, with very sparse weak punctures; 

 propodeum sloping, rather evenly convex in profile but apically a 

 little more abruptly declivous, without carinae except for pleural 

 carina and remnants of the median longitudinal carinae, which are 

 present on its apical 0.3 ± and indicated at its extreme base by a pair 

 of tubercles; propodeal spiracle long oval; legs very stout; second 

 trochanter of front and middle legs completely fused with its femur; 

 front spur of middle tibia a little shorter and stouter than the hind 

 spur; tarsal claws apparently simple; abdomen of moderate length; 

 first tergite rather narrow basally, its spiracle near its basal 0.35, 

 without distinct median longitudinal carinae; first sternite extending 

 about 0.3 the length of tergite; epipleurum of first tergite vestigial, of 

 second tergite rather narrow, of third through sixth tergites wide; 

 second tergite without dorsal carinae; first six tergites well expo- 

 sed, the seventh tergite partly retracted in male, completely re- 

 tracted in female; female subgenital plate elongate triangular. 



Genotype: Exochus validus Cresson, 1865. 



The generic name is from the Latin "cubus" (a cube), referring to 

 the shape of the propleurum. 



This is a Neotropic genus. Besides the genotype, from Mexico, 

 we have a new species from Guatemala and another from Venezuela. 

 The Venezuelan species is figured (fig. 170,b) to represent the genus. 



451582—59 10 



