218 PROCEEDINGS OF THE ACADEMY OF [Part II 



very slightly smaller size, distinctive and unspotted cephalic mark- 

 ing, pronotum with disk proportionately smaller when compared 

 with the ample lateral portions and tegmina with venation broadly 

 pale in all portions, so that the small remaining darker areas give 

 these organs a delicately tessellate appearance. 



Type:d^; Bartica, British Guiana. April 14, 1913. (H. S. Parish.) 

 [Acad. Nat. Sci. Phila., Type no. 537.] 



Size rather large for the genus, form depressed, in outline elongate 

 elliptico-ovoid. Head broad, decidedly depressed; from the dor- 

 sum practically the entire occiput and cephalic half of the eyes are 

 seen to be exposed, occipital outline truncate, the eyes almost im- 

 perceptibly projecting }3eyond the interocular area; interocular 

 space broad (.6 mm.), one and one-half times occipital ocular 

 depth, about four-fifths as wide as space between antennal sockets. 

 Maxillary palpi with third joint elongate and slender; fourth joint 

 three-quarters as long as third; fifth joint slightly longer than 

 fourth, moderately enlarged. Pronotum transverse elliptical, 

 with a marked rectangulate tendency, due to the wide and strongly 

 transverse cephalic and caudal margins, cephalic margin showing 

 a trace of convexity only above the head, caudal margin showing a 

 very feeble convexity, lateral margins broadly convex, rounding 

 evenly into cephalic and caudal margins; greatest width mesad; 

 disk with a shallow medio-longitudinal impression and a pair of 

 brief oblique sulci laterad, very sUghtly but appreciably smaller 

 in proportion to lateral portions than in lata; lateral portions 

 weakly declivent cephalad, where the surfaces are very shallowly 

 concave, weakly bossed over tegmina. Tegmina elongate, extend- 

 ing briefly beyond cereal bases, greatest width at proximal third, 

 thence narrowing evenly to near the sharply rounded but acute apex; 

 marginal field very broad; costal veins (17) with a number of false 

 veinlets between, discoidal sectors (16) strongly oblique. Wings 

 with intercalated triangle forming an angle of appreciably less than 

 ninety degrees. Sixth abdominal tergite with a very shallow 

 round depression mesad, rather thickly supplied with minute agglu- 

 tinated hairs. Supra-anal plate damaged in this specimen. Sub- 

 genital plate with flattened bases of the shallowly inset styles 

 occupying almost all of free margin; styles very elongate, nearly 

 three times as long as basal width, broad at base, tapering to the 

 lamellate and rather sharply rounded apices, unarmed on external 

 surfaces. Between the styles the median portion of the plate is 

 produced in a very slender, chitinous shaft, three-quarters as long 

 as one of the styles, showing a very slight and even curvature cau- 

 dad throughout its length and tapering to the aciculate apex. 

 Limbs and their armament, tarsi, claws, pulvilli and arolia as 

 characteristic of the genus. 



Allotype: 9 ; same data as type, except taken December 11, 1912. 

 [Acad. Nat. Sci. Phila.] 



