1921] NATURAL SCIENCES OF PHILADELPHIA. 219 



Agrees closely with type. Tegmina slightly shorter. Inter- 

 ocular space slightly wider. Supra-anal plate triangularly pro- 

 duced, strongly notched at apex, this rounded emarginate, deeper 

 than wide, the two sharply rounded portions thus formed with sur- 

 faces moderately convex, lateral margins feebly concave. Sub- 

 genital plate ample, narrow distal portion reflexed, longitudinally 

 cleft mesad. 



Head with vertex to point of least width between eyes auburn, 

 the line of demarcation there sharp, weakly convex dorsad in 

 male, transverse in female, face whitish buffy shading to ochraceous- 

 buff ventrad. Antennae in males mummy brown in proximal 

 fourth, thence much paler, buckthorn brown, in female pale buck- 

 thorn brown throughout. Pronotum with marginal portions trans- 

 parent, very faintly tinged with ochraceous-buff ; disk tawny, mesad 

 with a pair of small, parallel, longitudinal markings of ochraceous- 

 buff. In the female the disk is russet laterad, the area between and 

 about these markings alone tawny. Tegmina transparent, marginal 

 field and along costal margin very faintly tinged with ochraceous- 

 buff, the veins and veinlets in the other portions (except the hum- 

 eral trunk for a brief distance proximad, where it is ochraceous- 

 tawny) all broadly defined in this color, the very small intervening 

 areas in these portions weakly tinged with ochraceous-tawny, this 

 giving the tegmina a delicately tessellate appearance. Wings 

 transparent very faintly tinged with buff, except in proximal por- 

 tion of costal veins (strongly tinged with prouts brown in this area 

 in the intensively colored allotype) and about the intercalated 

 triangle, where they are weakly tinged with ochraceous-tawny, the 

 enlarged (distal) portions of the costal veins whitish. Limbs och- 

 raceous-buff. Ventral surface pale orchraceous-buff, showing a 

 whitish bloom. 



Measurements {in millimeters). 



Length Length Width Length Width 

 of of of of of 



cf body pronotum pronotum tegmen tegmen 



Bartica, British Guiana, type 11. 2.2 3.5 9.8 3. 



Cayenne, French Guiana, para^ype 10.7 2.2 3.55 10. 3.15 



Bartica, British Guiana, allotype 10. 62. 3 3.6 9.3 3. 



In addition to the described pair, a paratypic male from Cayenne, 

 French Guiana, property of the Paris Museum, has been examined. 



Chorisoneura barticae new species. Plate XIV, flgure 13. 



This insect may be distinguished from the multitude of related 

 species by the small size (tegminal length 8 mm. or less), the dis- 

 tinctively marked head, nearly unicolorous pronotum, which is 

 obscurely paler mesad, unicolorous tegmina except for the paler mar- 

 gins and male styles, which are developed as foliaceous plates taper- 



