30 



Number and arrangement of gills of 

 A.crassicornis 



Legs (Figures 24—26) light, without dots, with less marked chaetotaxy 

 than in the species described above. 



The subdorsal of the 2 anterior surface setae of the fore coxa (Figure 

 24, a), is not as large as inA. pagetana and D. obsoleta; the anterior 

 of the 2 ventrodistal setae of the tibia is smaller and thinner than the 

 posterior and is a straight, thick, blunt spine, like the basal spine of the 

 claw. Midleg as in Figure 25. Hind femur (Figure 26) slightly shorter 

 than in the preceding species, with very long dorsal setae; hind coxa 

 with very long ventral setae. 



Abdominal segment 7 posteriorly with teat-shaped lateral tubercle 

 near the base of the gill; segment 8 with similar but shorter and wider 

 process. 



Tergite of segment 9 (Figure 27) short, wider than in A. p a g et an a, 

 light, without pattern or dots, except for dark sclerotized dots at the base 

 of the setae. Medioanal setae long, reddish brown, margin between them 

 slightly dark; anterior -angle setae long, slightly lighter and thinner than 

 the medioanal setae; intermediate and lateral setae small, light. 



Sclerite "b" reddish brown dorsally, with small spines near the posterior 

 margin; a dark transverse plate further distally, with 3 long, thick, dark 



setae, of which the median and adjacent 

 setae are longer than the lateral; ventral 

 seta of sclerite short, dark brown. 

 Sclerite "c" dark brown, seta spiniform, 

 brown, shorter and thicker than the ventral 

 seta. 



Claw laterally with 3 dorsal denticles 

 at the curvature (Figure 28). Setae 1 and 

 2 small, thin, situated in basal part; seta 3 

 long, dorsally situated near curvature 

 of claw; seta 6 large, situated on the 

 outside; setae 7 and 8 short, thin, situated 

 in basal part; setae 5 thin, situated near 

 seta 5; seta 4 small, light, situated near 

 median line. 



Case made of thick fragments of 

 plants arranged in a spiral or of irregular 

 pieces of lime, arranged smoothly but 

 not always in a spiral; the material 

 consists of pieces of mollusk shells or 

 lime crusts from plants (Figure 29). 



Pupa. Length 16 — 20 mm in male pupae, 

 19— 22 mm in female pupae. Antennae 

 reaching segments 6 — 7 in male pupae, seg- 

 ment 5 in female pupae. Head anteriorly 

 with a tuberculate process, separated by a deep fold from the anteclypeus. 

 Labrum wide, shorter than in A. pagetana; median process blunt, barely 

 visible. Mandibles (Figure 30) curved, with well developed basal tubercle. 



Dorsal process of abdominal segment 1 concave in the middle, with 

 lateral processes. Holding apparatus on segments 5—7 (Figure 31 ); plates 



Segment 



Dorsal 



Pleural 



Ventral 



1 









1 



2 



1 



1 



1 





1 



3 



1 



1 



1 





1 



4 



1 



1 



1 





1 



5 



1 



1(0) 



1 





1 



6 



1(0) 



1(0) 



1 



1 



1 



7 



1(0) 



1(0) 



1(0) 





1 



8 



1(0) 



1(0) 





1(0) 



32 



