SUBFAMILY I. PIIAXEROPTERIXJE. 485 



hind margin broadly rounded into the lower one; tegmina coria- 

 ceous, ovate lanceolate, broadest at middle, both costal and sutural 

 margins tapering to the much narrower but rounded apex, the 

 overlapping- dorsal field forming a right angle with the median 

 area; wings distinctly projecting beyond the tegmina their tips 

 acuminate; all the femora armed beneath with several small 

 spines; hind ones short and very slender; meso- and metasternal 

 lobes elongate, their tips acute or narrowly rounded. Males with 

 supra-anal plate oblong-triangular, deflexed between the cerci, 

 the latter long, slender, subcylindrical, their tips usually incurved 

 and inucronate; subgenital plate composed of two separate lobes, 

 uniting beyond the middle, then tricarinate beneath, the terminal 

 processes bearing rather long, cylindrical styles. Female with 

 ovipositor very short, bent strongly upward, usually finely crenu- 

 late, with apex obtuse; subgenital plate triangular, compressed, 

 obtuse. 



This is an American genus whose species are mostly tropical, 

 Kirby (1906, 480) including 26 under the name Orophus Serv. 

 which he wrongly used for Microcail nun. Of these but two are 

 known from the United States, both occurring east of the Mis- 

 sissippi. 



KEY TO EASTERN SPECIES OF MICROCEXTRUM. 



a. Front margin of pronotum sinuate, and with a more or less distinct 

 median tooth; cerci of male with the tips incurved and mucronate; 

 ovipositor with apex subtruncate or very broadly rounded; gen- 

 eral color dark grass-green. 221. RHOMBIFOLIUM. 

 aa. Front margin of pronotum squarely truncate; cerci of male with 

 apical third thickened, the tip blunt, feebly or not at all incurved; 

 ovipositor with apex attenuate, narrowly rounded; general color 

 pale green, the head and under surface tinged with yellow. 



222. RETIXKRVE. 



221. MICROCEXTRUM RHOMBIFOLIUM (Saussure), 1859, 204. Larger Angu- 

 lar-winged Katydid. 



Size large both for the family and the genus, the sexes subequal. 

 Dark grass-green, the face, under surface, fore and middle legs and often 

 the front half of pronotum greenish-yellow often fading to dull clay- 

 yellow. Fastigium faintly silicate or, in the male, with a shallow median 

 pit. Disk of pronotum short, subquadrate, the median tooth of front 

 margin variable in size and form, always small, often vague; hind margin 

 broadly rounded. Tegmina ovate-lanceolate, surpassing the tips of hind 

 femora by two-fifths their length. Male with stridulating area elongate- 

 triangular, opaque, coarsely punctate; subgenital plate with outer carinse 

 subparallel, apex with a deep rounded notch. Other structural characters 

 as given in key and under generic heading. Length of body, $ , 25 28, 

 9, 28 30; of pronotum, $ and 9, 6 7; of tegmina, $, 42 45, 9, 43 



