FIGURES 652 and 653. Holocentropus dubius Ramb. (after Hickin): 

 652 - larva, dorsal; 653 - head, dorsal. 



Labrum* as in H. p i c i c o r ni s. Upper blade of left mandible with 

 3 teeth; 2 of them small; middle tooth very long; the basal of the 3 teeth of 

 the lower blade large, tuberculate anteriorly; penicillus in the median 

 depression consisting of several light, long, thick hairs. Upper blade of 

 right mandible with a large tooth and a small, basal denticle; lower blade 

 with 3 tuberculate teeth. Outer setae of mandibles situated close together, 

 light and long. Maxillolabium as in H. p i c i c o r n i s. 



Pronotum with indistinct dots; setae of thorax, legs, abdomen and anal 

 legs as in H.picicornis. 



Pupa. Length 7.0— 7.5 mm. Antennae of male pupae reaching abdominal 

 segment 8, those of female pupae segments 5—6. Labrum with rounded 

 anterior margin. Mandibles curved, crossed, with blunt ends. 



Wing sheaths reaching abdominal segments 5—6; natatorial setae present 

 on fore and mid-tarsi (hind tarsi without setae); mid-tarsi and mid-tibiae 

 of female pupae broad. Presegmental plates present on segments 3—8, 

 postsegmental plates on segment 5; number of spinules as follows: 111:5—7; 

 IV:5; V:4-6+ 8— 12; VI:5-7; VII:3-6; VIII:2— 4. Gills present on seg- 

 ments 2—7; gills of segment 2 with only a dorsal filament; gills of 

 segments 3—7 with a dorsal and a ventral filament. Lobes at end of 

 abdomen rounded, with numerous setae; ventral process of abdominal 

 segment 8 short, blunt. 



Hickin (1943:19, Figure 4) showed hairs in the anterior angles of the dorsal surface of the labrum in his 

 drawing; these hairs are actually situated on the ventral surface. 



509 



