BY ROWLAND E. TURNER. 77 



a 12 . Thorax marked with yellow. 

 a 13 . Scutellum marked with yellow. 

 a 14 . Median segment marked with 

 yellow on the middle and on 

 the sides. maculatus Gu6r. 85 



6 1 4 . Median segment marked with 

 yellow on the sides only. 

 a 15 . Head massive and rounded. 



medius Sm. 88 



b 15 . Head not very massive. 

 a 1 6 . With a yellow spot on the 

 vertex, maculatus Guer. 



var. odyneroides Westw. 85 

 6 16 . Without a yellow spot on 



the vertex, vividvs Sm. 86 



6 13 . Scutellum not marked with 



yellow. maculatus Gu6r. 



var. variegatus Klug. 85 

 b 12 . Thorax and median segment 

 black, postscutellum white. 

 a 13 . Legs black. luctuos us Sm. 92 



b 13 . Legs ferruginous, mar ginilabris Gu6r. 91 

 b 9 . Abdomen dark ferruginous, marked with 



white. rubdlus Sm. 93 



b s . Anterior margin of the pronotum black. 

 a 9 . Abdominal segments 2-4 with a yellow 



spot on each side. molestus Sm. 94 



fc 9 . Abdomen wholly black. adelaidai. 98 



b 7 . The median segment subtruncate. suspiciosus Sm. 96 

 b 6 . Second dorsal segment of the abdomen not 



depressed at the base. trochanter inus Westw. 99 



b r >. Hypopygium triangular with a short apical spine. 



albopictus Sm. 97 

 }A. The tubercle on the first ventral segment not developed. 



a 5 . Abdomen black and yellow. irregidaris Sm. 100 



b r >. Abdomen black with the two apical segments red. 



incensus Sm. 102 

 b 3 . The labrum not bilobed or very slightly so, usually 

 short and subtriangular. 

 a 4 . Abdomen flattened, the segments not constricted. 

 a 5 . Hypopygium without an apical spine. 



a 6 . Abdomen black and yellow. pygmaeus. 34 



6°. Abdomen marked with ferruginous. 



