176 PROCEEDINGS OF THE ACADEMY OF [May, 



and marginally lamellate distal sections of the caudal tibiae, as well 

 as by the character of the genitalia of both sexes. The more fully the 

 other features of the new genus are examined, the more superficial the 

 evident resemblance to Dellia is found to be. From all of the allied 

 genera Chloropseustes can be separated by its apterous condition, its 

 supra-genicular spiniform process and its highly polished surface; 

 from Tetratcenia also in the broadly emarginate caudal margin of the 

 pronotal disk, the more ( cf ) or less ( 9 ) sulcate frontal costa, the 

 simpler subgenital plate of the male and the absence of the clavation 

 of the distal extremity of the median femora found in the male of 

 Tetratcenia; from Eumastusia the new genus differs in the form of the 

 head and general type of the pronotum, as well as sculpture of the 

 same, in the non-compressed male subgenital plate and in the linear, 

 more exserted ovipositor jaws of the female; from Mastusia the new 

 genus also differs in the form and sculpture of the head and pronotum, 

 in the emarginate caudal margin of the pronotal disk and in the linear, 

 more exserted, female ovipositor jaws. The coloration of the type 

 species is very distinctive. 



Description of Genus. — Apterous. Glabrous. Surface of face, 

 gense, occiput, pronotum, pleura and proximal abdominal segment 

 with small, raised but low, callose, white areas. Interspace of vertex 

 narrow; fastigium subdeclivent, sulcate; fastigio-frontal region 

 truncate when viewed from lateral aspect; face retreating; frontal 

 costa distinctly (cf ) or weakly ( 9 ) sulcate mesad and ventrad, plane 

 dorsad; eyes prominent in both sexes. Pronotum with three very 

 deeply impressed transverse sulci, no lateral and little trace (in male 

 only) of median carinae ; cephalic and caudal margins of cUsk emargin- 

 ate mesad; mesonotum not equal to one-third the length of the 

 prozona. Supra-anal plate of male subtrigonal; cerci of male falci- 

 form; subgenital plate short, broad. Ovipositor jaws of female 

 elongate, straight, margins weakly denticulate. Prosternal spine 

 sub-compressed, conical, acute. Mesosternal lobes with interspace 

 sHghtly longitudinal ( cf ) or slightly transverse ( 9 ) . Metasternal 

 lobes contiguous (cf) or narrowly separated (9). Cephalic and 

 median femora of male subinflated, cephalic genicular lobe larger 

 than caudal lobe on each femur. Caudal femora with a more (cf ) 

 or less ( 9 ) pronounced supra-genicular spine, genicular lobes weakly 

 acute; caudal tibiae expanded distad, with the margins sublamellate, 

 external margin with seven spines, internal margin with nine spines; 

 caudal tarsi elongate, second joint subequal to one-half the length of 

 the metatarsus, third joint subequal to joints one and two together. 



