122 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



yoL. XXX vr. 



when seen from the side, the disk of the fastigium sHghtly depressed 

 near the apex; interspace between the eyes equal to the greatest 

 width of the fastigium; fastigio-facial angle rather narrowly rounded, 

 the line considerably (male) or very slightly (female) 

 retreating, a slight angle between the line of the 

 face and the line of the fastigium; frontal costa 

 distinct, narrow and subequal from the apical con- 

 striction to immediately ventrad of the ocellus, 

 where there is a decided constriction, thence the 

 margins diverge slightly (male) or considerably 

 (female) to the clypeal suture, the costa distinctly 

 but shallowly sulcate throughout its length; sup- 

 plementary facial carinas distinct, following in their 

 direction, but in a more pronounced manner, the 

 trend of the costal margins ; eyes decidedly (male) 

 or moderately (female) prominent, ovate in out- 

 line, in length slightly longer than (male) or dis- 

 tinctly shorter than (female) the infra-ocular por- 

 tion of the genae; antennae slightly exceeding the 

 length of the head and pronotum in the male, 

 somewhat depressed proximad. Pronotum with 

 the disk flattened, rising mesad to the crest, the 

 greatest width of the dorsum contained about 

 one and one-half times in the length; cephalic 

 margin obtuse-angulate in the male, with an 

 almost imperceptible angle in the female, caudal margin pro- 

 duced acute -angulate in both sexes, the apical spines very sharp; 

 median carina elevated into a serrate crest, which gradually increases 

 in elevation to the 

 middle of the meta- 

 zona, thence sharply 

 descends, the crest 

 being severed by the 

 three transverse sulci, 

 the incisions being 

 marked in both sexes, 

 but extending half- 

 way to the level of the 

 disk with the interme- 

 diate portions acute 

 dentiform in the male, fig. 9. heuonotus mirabilis. lateral view of male type. 

 the metazonal por- 



tion armed on the descending slope with long dentiform spines 

 similar to those seen in species of Col'polopJia; lateral angles pro- 

 jecting laterad and regularly armed with numerous blunt denticles 

 in the female and with a series of very prominent elongate spini- 



FiG. 8. Helionotus mi- 

 rabilis. Dorsal VIEW 



OF MALE TYPE. (X 2) 



