266 PROCEEDINGS OF THE ACADEMY OF [May, 



ochre yellow. Limbs ochre yellow marked with clove brown, the 

 caudal broadly lined dorsad, and the tibiae infuscate distad. 



Measure7nents. 



Length of body, 9.2 mm. 10 mm. 



Length of pronotum, 3 " 3 



Greatest width of pronotum, 3.9" 4 



Length of tegmen, 9.6 " 10.5 



Greatest width of tegmen, 3 '' 3 " 



The types are unique. 



ISCHNOPTEKA Burmeister. 

 Ischnoptera nyctiboroides n. sp. 



Type: ? ; Demerara, British Guiana. 1901. (R. J. Crew.) 

 Belonging to the group containing /. azteca, tolteca, nana and parvula, 

 but differing from all in the larger size, and apparently from most of 

 them in the comparatively large intercalary area of the wings. 



Size rather large; form robust, general form and coloration super- 

 ficially reminding one of a Nyctibora; surface glabrous, but not with 

 a very high polish. Head not hidden by the pronotum, the occipital 

 margin evenly arcuate, interspace between the eyes slightly wider 

 than the depth of one of the eyes; mandibular palpi with the distal 

 joint elongate-elliptical when viewed dorsad, the ventral surface ex- 

 cavate for the entire length. Pronotum of the shape usually found 

 in Ischnoptera, the cephalic margin sub-truncate, the caudal margin 

 sub-truncate with an extremely slight median angulation, lateral 

 margins slightly arcuate, the greatest width caudad; lateral sections 

 somewhat depressed, the disk without depressions. Tegmina extend- 

 ing beyond the tip of the abdomen by about two-thirds the length of 

 the pronotum; costal margin evenly arcuate; sutural margin straight 

 except in the distal fourth, where it is obliquely diverted toward the 

 apex which is in the general curve of the costal margin and rounded 

 acute-angulate in character; basal field not extensive; anal field 

 elongate-obovate, the apex blunt; veins of the anal area seven in num- 

 ber, the costal veins very numerous, discoidal field with the veins 

 distinctly longitudinal. Wing with the greatest width contained 

 slightly more than one and one-half times in the length; costal veins 

 about eleven in number excluding the branches of the mediastine vein, 

 the majority being distinctly but not at all greatly thickened near the 

 margin; discoidal vein with a caudal ramus diverging near the middle 

 anterior ulnar vein with two complete and about two incomplete rami ; 



