1905.] NATURAL SCIENCES OF PHILADELPHIA. 433 



tudinal veins marked with blackish. Abdomen dull brown, the seg- 

 ments margined caudad with a darker shade. Cephalic and median 

 limbs oil green, marked at the articulations with blackish-brown. 

 Caudal femora with the extreme proximal section and a section between 

 the middle of the genicular region oil green, the intermediate portion 

 and the genicular region Chinese orange; tibise verdigris green, the ex- 

 treme proximal section tinted with Chinese orange, spines blackish 

 apically; tarsi dull greenish. 



Measurements. 



& ? 



Length of body, 12.5 mm. 15 mm. 



Length of pronotum, 3 " 4.7 " 



Greatest width of pronotum, 2.2 '' 3.2 " 



Length of. tegmen, i " 6 " 



Greatest width of tegmen, 1.7 " 2.5 " 



Length of caudal femur, 8 " 11 " 



The types are uniciue. 



SYLETRIA« n. gen. 



A member of the Xiphiolce, and probably allied to the genus Saparus 

 Giglio-Tos, from which it differs in a number of characters. A decided 

 superficial resemblance to the genus Machcerocera is noticeable. 



Type. — S. angulata n. sp. 



Form compressed. Head very deep; occiput separated from the 

 vertex and fastigium by an elevated interocular region; fastigium 

 slightly produced, slightly broader than long; frontal costa narrow, 

 facial carinse distinct; eyes elongate elliptical. Pronotum depressed 

 above; median carina distinct but not highly elevated; no lateral cari- 

 nse but distinct humeral angles on the metazona. Tegmina elongate, 

 apex obliquely truncate. Abdomen strongly compressed. Prosternal 

 spine erect, conic. Interspace between the mesosternal lobes quadrate, 

 between the metasternal lobes longitudinal. Caudal femora slender, 

 dorsal carinse serrate. Caudal tibise with nine spines on the external 

 margin, no apical spine; internal margin with eleven spines including 

 the apical. 

 Syletria angulata n. sp. 



Type: 9 ; Carrillo, Costa Rica. [Hebard collection.] 



Size rather large; form distinctly compressed; surface uniformly 

 rugulose. Head when viewed cephalad twice as deep as wide; occiput 

 ascending to the vertex which is less than half the width of the fasti- 



8 Y,v7,rjTpia, a female plunderer. 



