538 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



hicluded species. — A. australiensis (Theobald), hiocellatus (Tay- 

 lor), and monocellatus Marks. 



Discussion. — Scales on the scutum of the three species included here 

 are fairly uniform in size, though the density of the scaling may vary ; 

 australiensis has the posterior margin of the pale scaled area on the 

 scutum sharply defined, but differs from Subgroup II in having no 

 dark scaling on the anterior half of scutum. 



Subgroup IX, FLUVIATILIS 



De-finition. — Neotropical. Basistyle without a tuft of specialized 

 scales. Claspette filament bladelike in lateral view. Male palpi as 

 in Subgroup I. Female tori scaled medially. Vertex dorsum with 

 narrow scaling at least medially. Scutal scaling not as in Subgroup 

 II. Ppn largely narrow scaled. Postspiracular area without scales. 

 Paratergite scaled. Neither femora nor tibiae speckled anteriorly 

 with pale scales. Hind tarsi with I-IV basally banded, may be a few 

 basal pale scales on V; one or more segments may have some apical 

 pale scaling. 



SuppleTnenta.i^ characters. — Scutellum with narrow scales. Sub- 

 spiracular area scaled. Preala scaled below knob. Larval head hair 

 5 posterior and slightly mesad to 6 and approximately on a transverse 

 line with 7, 4 mesad of 5. Comb scales numerous, in a patch. Larval 

 habitat : rock pools in stream courses. 



Included species. — A. ■ftuvia-tilis (Lutz). 



Subgroup X, KNABI 



Deprdtion. — Neotropical and sub-Nearctic. Claspette filament 

 nearly cylindrical, curved and appearing bladelike in lateral view 

 however (the male of knabi is undescribed) . White band on mid- 

 tarsal segment I usually only about one-fourth length of segment in 

 zoosopKus. Basal bands on hind tarsal segments I-IV, may be a few 

 basal pale scales on V. Midlobe of scutellum broad scaled, lateral 

 lobes narrow scaled. Ventral brush of larva not on a plate. Sub- 

 spiracular area scaled. Remainder as in Subgroup TV- 



Included species. — A. knabi (Coquillett) and zodsophus Dyar and 

 Knab. 



Subgroup XI, FENGI 



Definition. — Palaearctic. Basistyle without a specialized tuft of 

 scales. Claspette filament bladelike in lateral view. Male palpi with 

 long hairs arising apically on III, and all along IV. Female tori 

 scaled. Vertex dorsum narrow scaled. Scutal scaling not as in Sub- 

 group II. Ppn scaling broad and spindle shaped. Postspiracular 

 area scaled. Paratergite bare. Neither femora nor tibiae sprinkled 

 with pale scales anteriorly. Hind tarsi with I and II basally banded, 

 may be a few basal pale scales on III in some specimens. 



