asymmetrical, slightly displaced to the right. Setae concentrated near the 

 anterior margin; seta 1 massive, spinelike, long, transparent, curved inward; 

 seta 2 light, thin, situated on the membranous margin; seta 3 situated 

 laterally at the margin, longer and thicker than the others, light brown; 

 415 S eta 6 also thick, slightly longer than seta 5; seta 4 situated near the median 

 depression, straight, spinelike and light. 



FIGURE 587. Ecnomus tenellus Ramb. Head, dorsal 



Mandibles long, dark brown (Figure 589). Left mandible with a deep 

 median depression; upper blade projecting, with 4 teeth situated slightly 

 further basally than the large, projecting apical tooth; upper blade with a 

 serrated part basal to these teeth; lower blade with a distinct tooth and a 

 little marked tooth at the base of the apical tooth; right mandible with a 

 shallow median depression; upper blade with 2 large teeth in addition to the 

 apical tooth; lower blade with 2 small teeth and several short pointed 

 spinules; penicillus absent. 



Pregula fused with gula, fused with the head capsule. 



Maxillolabium (Figure 590) with maxillae projecting anteriorly; sclerites 

 yellow or brownish yellow, indistinguishable from the background of the 

 membranous part. Submentum with indistinct anterior lateral processes; 

 setae strong, situated at a distance from the margin; cardo slightly darker, 

 brownish yellow; ventral seta thin; medioventral margin of stipes thickened, 

 brown; a strong light seta near the apex; other part of sclerite thin, 

 yellowish; lateral outer seta situated on a membrane, thin; maxillary 

 palpifer broad; mediodistal angle of sclerite with a small seta; second seta 

 situated on a membrane near the anterior margin, relatively large, situated 

 between palp and galea, reaching end of galea; galea long, slightly curved, 

 its setae and sensillae well marked; palps narrow, long; 1 st and 2nd segments 



467 



