Labrum (Figure 597) broad, short, rounded laterally, with a shallow, 

 median indentation; dorsal sclerite of labrum yellow, covering labrum 

 almost completely, leaving only a narrow membranous margin near the 

 median indentation free; this margin covered with dense, short hairs; 

 longer and sparser hairs on the sides of the labrum; a narrow black stripe 

 posteriorly in the middle. Posterior angles and posterior-angle sclerites 

 black. The thin curved converging setae 1 anteriorly, on a membrane; other 

 setae also thin, light; seta 3 longer; seta 6 stronger than the others. 



423! 



FIGURES 596— 601. Plectrocnemia c on spers a Curt, (after Nielsen): 



596 - head, dorsal (A), lateral (B) and ventral (C); 597 - labrum; 598 - mandibles: 

 left mandible, dorsal (A), right mandible outer view (B) and dorsal (C); 599 — galea, 

 dorsal (A), ventral (B); 600 — distal end of 4th segment of right maxillary palp, 

 ventral; 601 — mentum and labial lobe, ventral. 



477 



