232 PSYCHE. [juiy ,5,5 



TABLE OF THE GENERA OF TRTXALIXAE. 



A *. Foveolae of the vertex wanting or invisible from above, their plane forming a 

 right or acute angle with the plane of the fastigium ; face usually more oblique 

 than in the alternate category. 



/' ^ Sides of the fastigium strongly rounded so that the apex is in no way 

 acuminate ; antennae depressed ensiform ; tegmina acuminate or angulate 

 at apex ; genicular lobes of hind femora (and generally also the genicular 

 angle itself) horizontally produced and acuminate (Hyalopteriges). 



itI. Fastigium greatly produced, as long as or longer than the eye, its 

 sides on basal half subparallel ; face excessively oblique, the eyes sub- 

 longitudinal ; genicular angle of hind femora longitudinally produced 

 and acuminate. 



d^. No foveolae of the vertex ; tegmina very much shorter than the 

 abdomen ; spines of outer margin of hind tibiae numerous, about 

 25 in number; subgenital plate of male abdomen excessively elon- 

 gate. ..... RhadinotatumM.z'^QxW (Note i). 



d^. Foveolae of vertex narrow, elongate ; tegmina surpassing the 

 abdomen ; spines of outer margin of hind tibiae less numerous, 

 about 16 in number; subgenital plate of male abdomen of moderate 

 length. ....... Acliunim Saussure. 



c''-. Fastigium subtriangular, not greatly produced, distinctly shorter than 

 the eyes, the sides converging from the base ; face less oblique, the eyes 

 distinctly oblique ; genicular angle of hind femora not longitudinally pro- 

 duced, but roundly deflexed, blunt. . TVy.vrt/w Fabricius (Note 2). 

 b ^. Sides of the fastigium straight or gently rounded, so that the fastigium is 

 more or less acuminate ; antennae variable ; tegmina apically rounded ; genic- 

 ular lobes of hind femora apically rounded, the genicular angle roundly 

 deflexed, blunt. 



r'. Hind tibiae armed with numerous spines, numbering 15-20, usually 

 18-20, on the outer margin (Mermiriae). 



c/'. Antennae long, ensiform; eyes of 9 somewhat shorter than the 

 infraocular portion of the genae ; prosternum with a distinct tuber- 

 cle ; anterior ulnar vein of tegmina situated midway between the 

 radial and posterior ulnar veins, the lower area reticulate in both 

 sexes. ........ Mermiria Stal. 



d'. Antennae filiform, apically ampliate in the $ : eyes longer than 

 the infraocular portion of the genae in both sexes ; prosternum with 

 no tubercle ; anterior ulnar vein of tegmina nearer the radial than 



