MORGAN HEBARD I 29 



Type. — cf ; Porto Bello, Panama. April 17, 1912. (A. Busck.) 

 [United States National Museum.] 



Size large for the genus; form depressed, in outline elongate elliptico-ovoid. Head 

 broad, decidedly depressed; from the dorsum practically the entire occiput and 

 cephalic half of the eyes are seen to be exposed, occipital outline truncate, the eyes 

 almost imperceptibly projecting beyond the interocular area; interocular space 

 broad, one and one-half times occipital ocular depth, about four-fifths as wide as 

 space between antennal sockets. Antennae nearly one and one-half times as long 

 as body. Maxillary palpi with third joint elongate and slender; fourth joint three- 

 quarters as long as third; fifth joint subequal in length to fourth, moderately 

 enlarged. 



Pronotum transverse ellii^tical, with a rectangulate tendency, due to the wide and 

 strongly transverse cephalic and caudal margins, cephalic margin showing a trace 

 of convexity only above head, caudal margin showing a very feeble convexity, 

 lateral margins broadly convex, rounding evenly into cephalic and caudal margins; 

 greatest width of pronotum mesad; disk with a shallow medio-longitudinal impres- 

 sion and a pair of brief oblique sulci laterad, lateral portions weakly declivent ceph- 

 alad, where the surfaces are very shallowly concave, weakly bossed over the teg- 

 minal bases. Tegmina elongate, extending briefly beyond cereal apices, greatest 

 width at proximal third, thence narrowing evenly to near the sharply rounded but 

 acute apex; marginal field very broad; discoidal vein with (sixteen) branches, be- 

 tween which are a number of well developed false nervures, discoidal sectors (fifteen, 

 counting all branches) strongly oblique.'" Wings with a considerable intercalated 

 triangle, acute-angulate proximad; (fourteen) costal veins (with nine) heavily and 

 briefly clubbed distad, the more distal with clubbed portion more elongate and 

 slender; discoidal and median \-eins connected by (ten) distinct cross-veinlets; 

 ulnar vein branching near extremity and sending another branch to the margin of 

 the intercalated triangle; axillary vein branching twice; the distal branch bifurcate. 



Sixth dorsal abdominal segment with a large but not strongly concave area mesad, 

 the margins of which are feebly raised latcro-cephalad, convex, the depression 

 containing a moderate number of agglutinated hairs, closely pressed upon its sur- 

 face. Supra-anal plate nearly one-third as long as basal width, triangular, with 

 apex broadly truncate and lateral margins very feebly concave, convergent. Cerci 

 elongate, depressed, fusiform, very slender distad, tapering to acute apices. Sub- 

 genital plate with sinistral margin short and straight to base of sinistral style, 

 dextral margin longer and moderately concave to base of dextral style; styles sit- 

 uated in poorly defined sockets, very elongate, broad at bases, tapering to apices 

 which are lamellate and rounded, this strongest externally, each supplied on its 

 internal face just before the apex with a central patch of microscopic teeth; between 

 the styles the median portion of the plate is produced in a slender chitinous shaft, 

 approximately half the length of one of the styles, armed at its apex with two small, 



15^ Five of the discoidal sectors spring from the discoidal instead of from the median 

 v^ein distad; this is an amplification of the condition found in many other forms of 



Chorisoneiira. 



MEM. AM. ENT. SOC, 4. 



