Number and arrangement of gills of L.a f f i ni : 



Segment 



Dorsal 



Pleural 



Ventral 



2 



3 

 3 



3 



3 



3-2 

 3-2 



3 



3 

 3 



3-2 



2 



3 

 3 



4 



3 

 3 



2 



2 



3 



3 



5 



2 



2 



1 







2 



2 



6 



2 







2 



1 



2 







2 

 2 



8 



2 







1 



216 



Legs reddish brown; basal segment of trochanter of all legs with 4—8 

 short, thin, secondary setae. 



Prinaary ventral setae of fore femur (Figure 375, A) in form of yellowish 

 spines, distal spines pointed, situated in middle of femur, basal spine 

 smaller; posterior seta strong, dark, situated subventrally above basal 

 spine or slightly more distally. Distal part of mid-trochanter with 4—5 

 thin, short, secondary setae. Primary ventral setae of mid-femur 

 spine -shaped yellowish, moderately long, distal seta situated in middle of 

 femur (Figure 375, B). Hind trochanter with 3—4 secondary setae distally. 

 Primary ventral setae of hind femur strong, brownish, situated close 

 together, thinner and longer than on mid-femur, the basal seta situated 

 in middle of femur, the 2nd larger, situated in distal part (Figure 375, C). 



Lateral line on segments 3—8; hairs small, brownish. Gills on 

 segments 2—8. 



Tergite of abdominal segment 9 yellowish white, with numerous, small, 

 pinkish dots at anterior margin; medioanal setae thick, long; anterior -angle 

 setae slightly sinaller; intermediate and lateral seta thin, blackish, the 

 former short, the latter moderately long, larger than intermediate seta, 

 contrary to usual; 2 thin, black setae, one short, the other moderately long, 

 between medioanal setae; 4—5 small setae on surface. 



Sclerite "b" of anal legs yellowish or light brown; setae at distal margin 

 reddish brown, mediodistal seta thick, moderately long, neighboring seta 

 almost the same, lateral seta thinner, strong, moderately long; ventral 

 seta dark brown; 2 similar setae at median margin; 4—5 short and small 

 setae on surface. Sclerite "c" forming an equilateral triangle, with 

 reddish brown lateral margin and a small, light brown seta. 



Claw uniformly chestnut brown, with a dorsal denticle; dark setae 

 reddish, light setae yellowish. 



Case with smooth walls, made of fine sand grains. 



Pupa. Length 13— 15 mm. Antennae reaching middle of segment 8, 

 scape with several, short setae. Labrum with broadly rounded, anterior 

 margin. 



269 



