5 (4). Ventral side of head brown; pronotum and mesonotum pale, 



without dots 3. A.bilineatus L. (p.550) 



6 (l). flead wide, with light stripes; gula large, transverse, irregularly 



trapezoidal or cup-shaped; mesonotum replaced by a slightly 

 thickened, sometimes slightly brownish, membranous area with 

 indistinct outline; streaks on posterior anglt distinct, in form of 

 large, long, curved, bracketlike, black stripes. 



7 (10). Case made of sand grains. 



8 (9). I-Iead light brown, with indistinct pattern of dots; light stripes 



narrow, not always distinct; mesonotum light, without dots 



5. A. annulicornis Steph. (p. 566) 



9 (8). Head with distinct pattern of dots and distinct light stripes; 



mesonotum slightly dark, with dark dots in middle 



4. A. excisus Mort. (p. 558) 



10 (7), Case iTiadt tntirt-ly, or in its greater part, of secretion, 



11 (14). Head light or d£.rk dorsally, with distinct dark dots; pronotum 



without wide dark band in anterior third. 



12 (13). Head dark dorsally: light adfrontal stripes wide, distinct; dots 



large, not numerous 6. A. fulvus Ramb. (p.570) 



13 (12). Head light dorsally, with numerous, oblong, dark dots 



7. A. alboguttatus Hag. (p. 574) 



14 (11). Head light dorsally, without pattern; pronotum with shining, black, 



anterioi- miargin 8. A. senilis Burm. (p.575) 



Pupa 



1 (6). Gills on segments 1 — 3 or 2 — 3; case conical, made of sand grains; 



anal rods straight; anterior and posterior membranes of case with 

 round or vertical slitlike opening. 



2 (3). Gills on segments 1 — 3; presegmental plates of holding apparatus on 



segments 3— 6, with small hooks; anal rods short, wide 



1. A. aterrimus Steph. (p. 545) 



3 (2). Gills on segments 2—3; presegmental plates on segments 3—7, 



with strorig, curved hooks; anal rods slightly longer and narrower. 



4 (5), Mandibles with a large tooth at base of serrated part; segments 



2 — 4 of hind tarsi with sparse setae . . .2. A. cinereus Curt. (p. 554) 



5 (4). Blade of mandible uniformly serrated; hind tarsi without natatorial 



setae 3. A.bilineatus L. (p. 550) 



6 (l). Gills on abdominal segments 2 — 7 or 2 — 8; anal rods narrow, pointed, 



more or less curved; case made of sand grains or secretion, 

 broadly conical, slightly compressed dorsoventrally, closing 

 membranes with a horizontal slit. 



7 (10). Case made of sand grains. 



435 8 (9). Dorsal presegmental gills on abdominal segments 2 — 7; anal rods 

 narrower in distal third, with concave inner side and hooked apex. 



5. A. annulicornis Steph. (p. 566) 



9 (8). Dorsal presegmental gills only on abdominal segments 2 — 3; anal 



rods curved in posterior third, narrower posteriorly 



4. A. excisus Mort. (p. 558) 



544 



