209 



Segments at least as long as broad, lateral margins without strong 



hairs 8 



8. Body covered with short decumbent hairs, or, if bare, without nar- 

 row stripe-like locomotor areas ; apical segment with 4 or 5 

 processes Limnophilinae (p. 220) . 



— Body without decumbent hairs ; locomotor organs consisting of nar- 



row transverse strips on dorsum and venter which are slightly 



leathery and armed with short spinules 



Limnobiinae, pt. (p. 212) . 



PUPAE 



1. Thoracic respiratory organs very short and stout, not more than 



twice as long as their greatest breadth ; armature of abdominal 

 segments weak, the same on dorsum and venter, consisting of a 

 single narrow, chitinized or setigerous, band 2 



— Thoracic respiratory organs very much elongated, usually more 



than 6 times as long as their greatest breadth or they are knobbed 

 at apices; or abdominal armature usually strong, thorn-like or 

 spinose, or not in the form of bands 3 



2. Thoracic respiratory organs well separated basally 



Limnobiinae, (p. 212) . 



— Thoracic respiratory organs subcontiguous basally 



Rhamphidiinae (p. 226) . 



3. A pair of large leaf-like projections above bases of antennae 



Hexatominae (p. 232). 



— No leaf -like projections above bases of antennae 4 



4. Abdominal segments each with 2 or more very long thorn-like pro- 



jections on posterior margin, which are in some species armed 

 with small branches ; rarely these projections are confined to 

 apical 2 segments Cylindrotominae (p. 210). 



— Abdominal segments each with small spines, or if rather large pro- 



jections are present they are short and leaf-like, rather numerous, 

 and unbranched 5 



5. Thoracic respiratory organs stout, knobbed at apices 



Pediciinae (p. 216) . 



— Thoracic respiratory organs slender, not knobbed at apices 6 



6. Thoracic respiratory organs not slender and tube-like, flattened and 



but little elevated Eriopterinae, pt. (p. 227). 



— Thoracic respiratory organs long and usually tube-like, much ele- 



vated 7 



7. Abdomen without dorsal or ventral armature; thoracic respiratory 



organs not longer than width of thorax, slender and tubejike. . . . 

 Eriopterinae, pt. (p. 227) . 



— Abdomen either with distinct armature on apices of dorsal segments 



or on both dorsal and ventral ones and with the thoracic respira- 



