setae; surface with 5—7 setae of different size, most of them small, ventral 

 seta thick, dark, moderately long. 



Sclerite "c" yellow, with wide, reddish brown lateral margin; seta small, 

 dark. 



Number and arrangement of gills of L.flavicornis 



Segment 



Dorsal 



Pleural 



Ventral 



2 



3 



3-2 





3 



3-2 





3-2 



3 



3 



3 



2-3 





3 



3 





3-2 



3 



4 



3 



2-1 





3 



3-2 





2-1 



3 



5 



3 



1(0) 





3 



3-2 





1(0) 



3-2 



6 



2 







3-2 



2-1 





1(0) 



2 



7 



2-1 







2-1 



2-1 







2-1 



8 



1-2 







1(0) 



Claw reddish brown, darker apically, with a large dorsal denticle and 

 several, minute, light, basal spinules; seta 1 situated on median side of 

 basal part, short; seta 2 situated dorsally near suture, moderately long, 

 brown; seta 3 similar, situated dorsally in distal part; seta 6 short, dark, 

 situated distal to suture; basoventral setae 7 and 8 light, reaching apex 

 of claw; seta 5 small, light, situated nearby lateral to 8; seta 4 situated 

 medially, slightly larger. 



Case straight, 19—24 mm long, made of large particles, arranged 

 transversely or obliquely (Vol. II, No.l, Figure 75); particles of about the 

 same size in young larvae; case of older larvae made of smaller particles 

 posteriorly, with large particles anteriorly, sometimes large fragments of 

 detritus, arranged in different directions; some cases are made partly or 

 entirely of mollusk shells, often rather large shells; anterior end of case 

 truncate, posterior end narrow, closed by membrane with a broad, round 

 hole, sometimes completely covered with small plant fragments (Vol. I, 

 Figure 106, C, D). 



Pupa. Length 17— 19mm (Figure 319). Antennae reaching segment 8. 

 Labrum and mandibles as in L. rhomb icus. Wing sheaths reaching 

 segment 4. Mid -tarsi with dense setae; hind tarsi with setae only on 

 segment l,more sparse than in L. r ho mb i c u s. Dorsal process of 

 abdominal segment 1 as in Figure 320. Dorsal plates of holding apparatus 

 less developed than in L. r h o m b i c u s, segment 3 usually without plates, 

 sometimes present on one side only; segment 5 with fewer postsegmental 

 hooks; number of hooks : 111:0-3; IV:2-5; V:2-349-15; VI:2-4; VIl:2-5. 

 Gills on segments 2— 8, number and arrangement as in L. rhombic us. 



239 



