266 Mr. J. O. Westwood on the 



rugoso, mesonoti angulis anticis scutelloque flavis; antennis 

 gracilibus, 34-articulatis ; alis hyalinis, cellulis obliquis discoi- 

 dalibus ordinariis 15 vel 16. Tab. 18, fig. 3. 



Long. corp. lin. 10 ; expans. alar, antic, lin. 23. 



Habitat in Brasilia. Mus. Hope. 



This is one of the largest species in the genus, and is dis- 

 tinguished by the great number of the narrow discoidal cells of the 

 wings. The face is black ; the labrum and a narrow line on each side 

 yellow, reaching from the clypeus to the back of the head, uniting 

 with a transverse yellow line on the crown, which is considerably 

 depressed behind the antennae, a slender carina extending along 

 the hind part of the crown, which is of a dark brown colour. The 

 mandibles are black, with the tips dark chesnut, the palpi fulvous. 

 Antennae black, two basal joints yellow beneath, terminal joints 

 orange, slender, about twice the length of the head, 34-jointed, 

 the basal joint strong, the 2nd small, nearly rounded, 3rd longer 

 than the 2nd, 3rd and following very short, transverse, terminal 

 joint conical. Prothorax rather elongated and slender, opaque, 

 very slightly transversely rugose in its cylindrical part, moderately 

 dilated in front, with the two ordinary tubercles very small. A 

 semi-circular slender yellow line extends across the dilated anterior 

 part from one anterior angle to the other ; the under side is yellow, 

 and there extends a yellow branch from the side obliquely upwards 

 and forwards, and gradually becoming lost in the dark ground 

 colour ; the extremity of the upper side is black, preceded by a 

 yellow lunule. Meso- and meta-nota black above, the anterior 

 angles of the former, and a small dot on each side of both, toge- 

 ther with the scutella, yellow ; beneath and at the sides yellow, 

 with slender black lines. Abdomen brown above, segments 

 broadly black at the margin, beneath orange, with a slender mar- 

 ginal black line to each segment. Fore legs with the coxae out- 

 wardly dusky, the upper and lower edges paler ; within yellowish, 

 with a dark line forming a transverse ring about one-third from 

 the base; femora externally dark fulvous, with an angulated 

 dusky line extending from near the base to the apex, internally 

 dark chesnut, varied with orange colour ; tibiae black, with a 

 slender yellow line on the upper edge ; tarsi with the basal joint 

 elongate-conic, hairy beneath ; four terminal joints very slender, 

 terminated by a very minute single unguis ; four hind legs long, 

 slender, fulvous ; femora with the extremity and tibiae with the 

 base dusky ; ungues short, broad, terminated by six acute teeth ; 

 pulvillus broad, each side dilated into a pseudo-pulvillus. Wings 

 long, nearly hyaline and colourless, principal veins elongated ; 



