282 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



for festac, Giglio-Tos records versicolor as well and suggests the 

 possibility of festae being but a variety of that species. 



The present species is a member of the distii\ctive South 

 American group H of the subgenus Xiphidion, remarkable for 

 the brilliant and very distinctive coloration of the species. 



The male sex of the species is very striking, the green cephalic 

 and median limbs, wings and cerci contrasting brilliantly with 

 the yellow head, lateral lobes of the pronotum, caudal femora 

 (excepting the dark genicular areas) and abdomen, which latter 

 furthermore has the dorsal abdominal segments strikingly marked 

 as follows: the proximal five are shining black dorsad and laterad, 

 the sixth and seventh maculate with black meso-dorsad, while 

 the greater part of the eighth and all of the ninth and tenth are 

 shining black. The female has the abdomen similarly but much 

 less strongly darkened. 



Size rather large, form graceful with limbs decidedly elongate. 

 Vertex not strongly but distinctly ascending, narrow, greatest 

 width one-half that of proximal antennal joint, slightly over two 

 and three-fourths times as deep as wide, sides straight and very 

 weakly convergent. Eyes moderately large and decidedly pro- 

 truding. Antennae greenish with each joint annulate at the 

 suture with brown, in material before us 62 mm. in length. 

 Lateral lobes with cephalic margin convex to the sharply rounded 

 ventro-caudal angle, ventro-cephalic angle broadly rounded 

 but evident, caudal margin subsinuous, almost straight, humeral 

 sinus absent, convex callosity very narrow. Tegmina, in macrop- 

 terous and brachypterous material, with apex sharply rounded; 

 male tympanum very small and distinctly though not strongly 

 longitudinal. Male cerci moderately elongate (2 to 2.2 mm. in 

 material before us), very slightly but noticeably irregular in 

 outline, basal third moderately stout, mesal third distinctly and 

 evenly swollen, this swelling more decided, however, above a 

 rather long and rather slender ventral tooth which is straight to 

 the sharp decurved apex, the tooth situated proximad of the 

 middle and directed strongly meso-proximad, distal portion curved 

 weakly outward, distinctly but regularly flattened, particularly 

 on the inner side, with margins very weakly irregular but con- 

 verging evenly to the rather shar])ly rounded ai)ex. The ccm-cus 

 has the same appearance found in the North American (\ ni'iiro- 

 pleuroides, suggesting minor irregularities more strongly than do 



