88 APPENDIX. 



as long as the ulna; cubitus very short, not one-sixth of the 

 length of the radius ; stigma rather large, emitting no branch. 



THORACANTHA Anchurus, Walker, MSS. Nigrocyanea anten- 

 nis nigris, basi fulvis,pedibusjlavis, alls iimpidis. 



Body bluish-black, gibbous, shining : head and thorax trans- 

 versely rugulose : head not so broad as the thorax ; front smooth, 

 shining : mouth fulvous : antennae black ; first joint fulvous : 

 scutellum longitudinally furrowed, and armed with two striated 

 very long and slightly bent spines : propodeon very large, rugu- 

 lose, slightly furrowed : podeon cylindrical, very slender, as long 

 as the propodeon : abdomen compressed, smooth, shining, shorter 

 and narrower than the thorax; metapodeon hiding all the other 

 segments: legs yellow, very slender; coxa? black; wings limpid; 

 nervures pale-yellow ; humerus nearly twice the length of the . 

 ulna ; radius none; cubitus very short; stigma extremely small. 

 Length of the body 2 lines ; expansion of the wings 4 lines. 



a. Brazil. 



Page 22. THOROCANTHA Nasua, Walker, MSS. Viridis cupreo 

 et cyaneo varia, antennis ferrugineis, 8-ramosis, basi fulvis, 

 pedibus fulvis, coxis cyaneoviridibus, alls Iimpidis , proalis 

 fusco subnebulosis. 



Male; Body convex, bright green, slightly varied with blue 

 and cupreous : head transverse, short ; vertex broad, minutely 

 punctured ; front large, almost smooth, abruptly decumbent : 

 mouth fulvous : eyes piceous, oval, of moderate size : antennae 

 filiform, ferruginous, pubescent, adorned with eight branches, as 

 long as the head and thorax ; first joint fulvous, long and stout ; 

 the following joints very short ; those towards the tip longer: tho- 

 rax gibbous, coarsely punctured : prothorax extremely short, not 

 visible above : scutum of the mesothorax large ; sutures of the 

 parapsides distinct, approximating near together on the fore- 

 border of the scutellum ; scutellum two-lobed ; the first lobe trans- 

 verse, narrow ; the second prominent, obconical, abruptly decum- 

 bent behind, furrowed lengthwise above, the tip divided into two 

 long spines which are slightly curved inwards : metathorax very 

 short : propodeon large, obconic, abruptly declining : podeon stout, 

 nearly smooth, less than half the length of the abdomen : abdo- 

 men 'oval, bluish-green, smooth, shining, slightly compressed, 

 much shorter and narrower than the thorax ; metapodeon ex- 

 tremely large, occupying all the dorsum, and hiding the ventral 

 segments : legs very slender, fulvous, pubescent ; coxae small, 

 bluish-green ; spines of the tibiae small ; first joint of the tarsi 

 nearly as long as the other four ; third joint shorter than the 

 second, but longer than the fourth ; fifth joint nearly as long as 



