thin, small, situated at the level of the posterior frontal seta. Ventral 

 seta 8 small, dark, situated near the margin; seta 18 very small. 



Dorsal sclerite of labrum (Figure 638) yellow, smoke brown laterally, with 

 light spots at the base of the setae; 2 semicircular brown spots near the 

 posterior margin; posterior-angle sclerites with reddish brown stripes. 

 Setae 1 light, recumbent on the median indentation; setae 4 spinelike, 

 44 '-' brownish, situated posterior to the median indentation; setae 2 and 5 



situated laterally, at a distance from the anterior margin, thin, light brown; 

 seta 6 similar, situated posterior to the median seta; seta 3 dark brown, at 

 the margin, longer and thicker than the others. Narrow membranous 

 margin of labrum with sparse white hairs anteriorly and laterally. 



(442) 



FIGURES 637 and 638. Holocentropus picicornis Steph.: 

 637 - head, dorsal; 638 - labrum. 



Upper blade of left mandible (Figure 640) with 3 teeth, middle tooth 

 projecting basal tooth small; lower blade with 3 large teeth and a small 



501 



