444 PROCEEDINGS OF THE ACADEMY OF [June, 



Guatel, Costa Rica. April, 1902. (C. F. Underwood.) [A. N. S. 

 Phila.] Eight males, nine females, one nymph. 



Monte Redondo, Costa Rica. January, 1903. (C. F. Underwood.) 

 [A. N. S. Phila.] Two males, three females, eight nj-mphs. 



San Jose, Costa Rica. September, 1902. (C. F. Underwood.) 

 [A. N. S. Phila.] Three nymphs. 



Tarbaca, Costa Rica. November, 1902. (C. F. Underwood.) 

 [A. N. 8. Phila.] One female. 



Pozo Azul de Pirris, Costa Rica. August, 1902, and January, 1903. 

 (C. F. Underwood.) [A. N. S. Phila.] Four males, seven females. 



This Mexican and Central American form can be distinguished from 

 the South American 0. flavo-Uneata by the shorter tegmina and wings 

 in both sexes and the broader head and less prominent eyes. Deme- 

 rara specimens of 0. flavo-Uneata and Xersi Cruz and Tamaulipas speci- 

 mens of tolteca have been used for comparison. 



RHACHICREAGKA^ n. gen. 



Type. — R. nothra n. sp. 



Allied to Polysarcus Saussure, but differing in the presence of minute 

 tegmina, the greater muiiber of joints in the antenna^, the slightly pro- 

 duced fastigium of the vertex, and the more distinctly forked cerci. 



Form robust, obese in the female. Head with the vertex short, 

 declivent, produced moderately beyond the face, frontal costa precur- 

 rent, sulcate; antennae filiform, twenty-two to twenty-three joints. 

 Median carina of the pronotum distinct, elevated, subcristate on the 

 metazona. Metanotum and proximal segment of the abdomen with 

 a median carina which is more elevated caudad. Tegmina minute, 

 linear. Cerci of the male very distinctly forked. Prosternal spine 

 erect, unguical, acute, slightly antrorse. Interspace between the meso- 

 sternal lobes subquadrate in both sexes ; interspace between the meta- 

 sternal lobes subquadrate in the male, strongly transverse in the female. 

 Arolia present. 

 Bhaohioreagra nothra'° n. sp. 



Types: d^ and 9 ; Carrillo, Costa Rica. [Hebard collection.] 

 Size rather small in the male, medium in the female; form robust in 

 the male, decidedly obese in the female; surface rugoso-punctate, the 

 dorsum of the thorax heavily sculptured. Head with the occiput and 

 vertex evenly rounded, the interocular space about half the width of 

 the cephalic margin of the fastigium in the male, slightly narrower than 



•Ta^tf, hack; upeaypa, hook. 

 ^"Nw^/oa, inactive, sluggish. 



