Appeiidix 383 



Abdomen, brilliant black above and bare, 

 except at the base of the first segment, which 

 bristles with whitish hairs. All the segments 

 have a wavy transversal band, wider at the 

 sides than in the middle and nearer to the hinder 

 edge as the segment is farther back. On the 

 fifth segment the yellow band touches the 

 hinder edge. Anal segment, yellow, black at 

 the root, covered all over the dorsal surface 

 with rusty-red papillae, forming a base for 

 bristles. A row of similar bristle-bearing pro- 

 tuberances occupies also the hinder edge of the 

 fifth segment. Underneath, the abdomen is 

 brilliant black, with a triangular yellow patch 

 on either side of the four intermediary segments. 



Black hips ; thighs, yellow in front, black 

 behind ; yellow legs and tarsi. Transparent 

 wings. 



In the male the chevron mark on the shield 

 is narrower, or even entirely absent, in which 

 case the face is all yellow. The bands on the 

 abdomen are a very pale yellow, almost white. 

 The sixth segment has a band like those which 

 come before, but shorter and often reduced to 

 two dots. The second segment has under- 

 neath it a longitudinal carina, raised and spine- 

 shaped at the back. Lastly, the anal segment 

 carries below it a rather thick angular projec- 

 tion. The rest is the same as in the female. 



