2 34 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



apical spurs on the inner side of the posterior femora are never very 

 unequal. The valves of the ovipositor are moderately exerted. 



T7icxalis iyOrpJiula), Stal, 1873. Recen. Orth., I, 105. 



In part, Sfenobotlirus , Scud., 1861. Jour. Bost. Soc. Nat. Hist., 

 VII, 456. 



In part, Stenobothriis, Thos., 1873. Syn. Acrid. N. Am., 80. 



Orphula, Boliv., 188S. Ex. Mem. Soc. Zool. France, 27. 



Orphula, Brunner. Rev. Sys. Orth., 119. 



Orphula, Morse, 1896. Psyche, VII, 326, fig. 8, loa. 



This genus is given by Stal as a sub-genus of Truxalis. It was 

 founded upon T. pagana, Stal, T. pleheia, Stal, T. iiitricata, Stal, and 

 Acridium punctatum , De G. The first and third mentioned are South 

 American species ; the second is from Honolulu ; and the fourth from 

 Surinam, Rio Janeiro and Columbia. It is represented in North 

 America and the West Indies by seven species! 



Key to orphula, Stal. 



A.' Discoidal field of the tegmina (female) scarcely narrowing dis- 

 tally where it is occupied nearly always by more than one row of 

 cells and is little if any narrower than the ulnar area at its widest 

 part. The ulnar area in the male is either divided into two se- 

 ries of cells by a more or less distinct false vein or it is irregularly 

 reticulate, never occupied throughout with a single series of per- 

 pendicular or oblique cross-veins. The tegmina extend beyond 

 the tips of the posterior femora always. 



B.' Antennae very slender, very slightly depressed and not somewhat 

 suddenly constricted near the tip and acuminate, as long as the 

 head and pronotum even in the female. Lateral carina of the 

 pronotum most nearly approximate at the second transverse 

 sulcus I • — Fdid/ia, Burm. 



B.2 Antennae not very slender, strongly depressed, somewhat sudden- 

 ly constricted near the apex and acuminate, shorter than the 

 head and pronotum (female) or but little longer (male). Lateral 

 carinas of the pronotum most nearly approximate at the trans- 

 verse sulcus 2. . . — Olivacca, Morse. 



A. 2 Discoidal area of the tegmina of the female generally plainly nar- 

 rowed distally where it is nearly always occupied by a single row 

 of cells, and is plainly narrower than the ulnar area at its widest 

 part. The ulnar area in the male is occupied by a single series 

 of transverse veins. The tegmina rarely exceeding the abdomen 

 (female) or the tip of the posterior femora (male). 



