1921] NATURAL SCIENCES OF PHILADELPHIA. 231 



sinistral of these bearing a stout chitinous spine, the dextral armed 

 with two spines. 



General coloration buckthorn brown. Head of this color, a 

 broad transverse band of cinnamon brown between the eyes, 

 sharply delimited ventrad by a much narrower transverse band of 

 cinnamon-buff between and including the ocellar spots, below this 

 with a narrow marginal suffusion of cinnamon brown, which laterad 

 runs down beside the antennal sockets, and another transverse 

 suffusion of the same above the clypeus.'"' Pronotum with disk 

 weak ochraceous-tawny, with the characteristic fine picturing of 

 cinnamon brown, this sometimes very weak, occasionally much suf- 

 fused; lateral portions transparent, very faintly tinged with brown- 

 ish. Tegmina transparent, very faintly tinged with brownish, 

 particular^ along costal margin, the veins with minute scattered 

 dots of prouts brown and with distal cross-veinlets shghtly dark- 

 ened except in recessive examples, where even the dots are con- 

 siderably reduced in number. Underparts and limbs buckthorn 

 browm, with flecks of prouts brown on the latter at bases of spines. 

 Ventral surface of abdomen w4th a broad medio-longitudinal black- 

 ish band, broad on subgenital plate of male, narrow or failing to 

 reach this portion in female. 



Measurements {in millimeters). 



Length of Length of Width of Length of Width of 

 cf body pronotum pronotum tegmen tegmen 



Bartica, British 10.7-11.3 2.6-2.8 3.2-3.4 10.7-11.3 3.2-3.3 



Guiana (5) 

 St. Jean du Maroni, 9.2-10.5 2.7-2.8 3.4-3.6 11-11.3 3.2-3.3 



French Guiana (2) 

 Igarape-Assu, Para, 10.7 2.7 3.5 11.3 3.3 



Brazil, type 

 Igarape-Assu, Para, 9.3-11 2.4-2.8 3.3-3.8 10.7-12 3.1-3.7 



Brazil, paratypes (9) 

 9 

 Bartica, British 10-10.2 2.8-2.8 3.7-3.8 10.9-11 3.2-3.2 



Guiana (3) 

 St. Jean du Maroni, 9.4 2.6 3.4 10.7 3.1 



French Guiana 

 Igarape-Assu, Para, 10. 2.7 3.6 10.9 3.2 



Brazil, allotype 

 Igarape-Assu, Para, 9.6-11 2.7-3 3.3-3.8 10.8-11.7 3.2-3.6 



Brazil, paratypes (12) 



These individuals are exceedingly delicate in structure, the man- 

 ner in wdiich the abdomen has dried having a marked effect upon 

 the body length of the material preserved. 



*^ These markings are heavier in intensive examples. As in conspersa, however, 

 the interocellar pale band is always conspicuous except in discolored specimens. 



