November — December iSqo. ] 



PS7'CHE. 



439 



than figured by Glover, becomes obscure 

 and paler toward the costal margin, 

 where it is traversed by pallid cross- 

 veins, and has the interior margin at 

 this point limited by the divarication of 

 the discoidal vein. 



The fourth genus, Machaerocera 

 Saussure, is a common form in Mexico, 

 and need not detain us here. It shows 

 no elevation of the metazona whatever. 



The fifth genus of the table is founded 

 upon a species from Peru, which I 

 formerly described as a Machaerocera, 

 but which must be separated from it, Its 

 distinctive features being shown in the 

 previous table. It may be called 



Peruvia gen. nov. 



Body slender, subequal, compressed. Head 

 moderately stout, trigonal. Vertex, includ- 

 ing fastigium, gently and regularly convex, 

 both longitudinally and transversely, with a 

 distinct and equal median carina its entire 

 length; triangular fastigium advanced in 

 front of the eyes as far as their separation, 

 the converging sides margined, the tip 

 rounded; front considerably and almost uni- 

 formly declivent, faintly convex in front of 

 the antennae, forming above a right angle 

 with the vertex; frontal costa moderately 

 broad, slightly expanding at the antennae, 

 with subparallel sides, a little divergent be- 

 low, with a broad and deep sulcus; lateral 

 carinae prominent, parallel in upper half, 

 considerably divergent in the lower; lateral 

 ocelli next the eyes separated from them by 

 their own width at the termination of the 

 lower edge of the carinate margin of the 

 fastigium of the vertex. Eyes semiglobular, 

 prominent, equal, or perhaps a little more 

 than equal, in width to the infraocular por- 

 tion of the genae; beneath the middle of the 

 eyes a short vertical carina which fades be- 

 fore reaching them. Antennae moderately 



slender, the six joints beyond the second de- 

 pressed (beyond broken). 



Prothorax compressed with parallel sides, 

 the dorsum plano-subtectiform, with a strong 

 subequal median carina throughout; prozona 

 fully as long as the metazona, with parallel, 

 slight, irregular, lateral carinae which are not 

 far removed from the middle of either side; 

 it is traversed by two straight transverse sul- 

 ci which cut the carinae. but the anterior of 

 which does not extend upon the lateral lobes, 

 being supplanted by another in advance of 

 it; metazona with scarcely more than should 

 dered lateral canthi, its posterior margin an- 

 gulate at a little more than a right angle; 

 lateral lobes with normal sulci, the anterior 

 and posterior margins subparallel, the lower 

 posterior angle rectangulate but with a slight 

 posterior lobe, the lower margin horizontal 

 in its posterior half and anterior fourth, the 

 second fourth oblique exposing the pleural 

 plate, which shows a small descending lobe 

 at its anterior end. Metasternal lobes of fe- 

 male only a little more than half as distant 

 as the mesosternal, marked inwardly by two 

 profound pits. Tegmina moderately slender, 

 the anterior margin with a distinct lobe at 

 the end of the basal fourth, subcoriaceous 

 throughout but nowhere closely reticulate 

 except at the extreme base and on the costal 

 and anal margins; no intercalary vein ; ulnar 

 vein approaching the median and widely sep- 

 arated from the posterior ulnar; median vein 

 simple, axillary vein impinging on the anal. 

 Wings with humeral field very broadly sca- 

 lariform, the radiate veins below normal. 



The single species known to me Is P. 

 nigromargiiiata from the Peruvian An- 

 des, described by me (Proc. Bost. soc. 

 nat. hist. 1875, v. 17, p. 268) as a species 

 of Machaerocera. It Is of small size. 



The last genus In this division of the 

 acrolophitinae Is founded upon a sin- 

 gle female specimen, not in the most 

 satisfactory condition, from California. 



