1904.] NATURAL SCIENCES OF PHILADELPHIA. 671 



Size large; form compressed; surface riigulose. Head with the occi- 

 put and vertex ascending; fastigium produced, elevated, not retrorse, 

 slightly antrorse, acute, apex truncate with a slight median cmargina- 

 tion, median carina present dorsad and cephalad; face flattened, 

 slightly concave, much as in 0. ceylonicus; infra-ocular carinae very 

 sharp; frontal costa with a flask-shaped expansion between the an- 

 tennae; antennse short, but slightly exceeding the greatest length of 

 the eye; eyes crudely elongate-ovate, distinctly shorter than the infra- 

 ocular portion of the gense, little prominent. Pronotum strongly com- 

 pressed ; median crest strongly elevated, produced over the head almost 

 to the tip of the fastigium, very slightly arcuate in the cephalic half, 

 bisinuate on caudal half; caudal process acute, slightly recurved at 

 the apex; lateral lobes about as high as long, cephalic and caudal 

 margins straight, inferior margin truncato-sinuate. Tegmina elongate, 

 lanceolate; apex acuminate, narrowly rounded, exceeding the tips of 

 the caudal femora; costal margin strongly dilated proximad. Wings 

 equal to the tegmina in length, tips caudal and extending beyond the 

 major portion of the wing a distance equal to one-fifth the total length 

 of the member. Ovipositor valves with the margins crasso-dentate. 

 Cephalic femora dilated, pyramidical in outline the apex proximal; 

 tibiae slightly bowed. Median femora with the dorsal carina slightly 

 elevated and arcuate, the cephalo-ventral carina moderately lamellate 

 distad; tibiae straight. Caudal femora heavy, dorsal carina arcuate 

 and strongly serrato-dentate, ventral carina minutely serrate, external 

 pagina with an irregular rhomboid pattern; tibiae slightly sinuate dis- 

 tad, proximal section with an acute trigonal lobe on the dorsal surface, 

 spines on the internal margin larger than those on the external ; meta- 

 tarsi slightly shorter than the remaining tarsal joints. 



General color tawny-olive, suffused on the dorsal half of the pro- 

 notum with raw umber ; a broad bar of buff covering the genae and the 

 lateral lobes of the pronotum, the distal half of the caudal femora, the 

 proximal half of the caudal tibiae and the cephalic and median femora 

 irregularly blotched and suffused with the same tint. 



Measurements. 



Length of body, 38.5 mm. 



Length of pronotum, 13 " 



Greatest depth of pronotum 11 " 



Length of tegmina, 21.5 " 



Length of caudal femora, 17 " 



The type is unique. 



