* M:\V \\\\<. STATIC MTSIMM 



lilt Full grown l:irv;i over C> mm. in length; mandible not 



transversely wrinkled 

 i I.abium with its teeth rounded. ]il.'_'u. lig.'.i 



36 1> i a in c s :i waltlli. 1 

 ii Lahium with its middle tooih broadly truncate 



:;7. T li :i 1 a s s i in y i a f u s c a 

 Null-'. See :nlilriiil:i f..|- se\rral a n< HUM \\\< >\ ..... ies. 



n I'lipM tlo.-its nearly m<-t i<mli"-s in a vertical portion at the surface of the 

 water. |il.l7. lig.11 ...................... tfirt>ui> <' 'fill n i> <> y <> n ) 



mi I'lipa in>| as ab:i\e 



// Active pupa swh ..... inir \\illi a j.Tkini,' nmtimi in lln- wali-r like a ciilcx 



pupa, pl.l'.i. liu'.s ............................. ( dnnii, '/' n n >/ /i u .\ ) 



C \\\\\i II-II.L' M-lac i-r lilaiiifiits :il i-amlal i-inl 



'/ Caudal lilaiuciils very numrnHis and fi-rinini: a raudal paddle, 



l-l.-.-J. liir.l I. and pl.'J;. flg.15 

 ' Tlioraric n ^pirati i'.\ "I'^ans a luft nf lilaniniH. iil.li;. li^.L' 



38 i ' li i r ' 11 it in u s 



lle^piralory < Trails < mi^i-i in^' "f a main shaft with lateral hairs 



or setae. . \l>d" men with setae and hrisiles. 



II'. T a n y t a p 8 U 8 

 ihl Caudal appendage \\ith Imi.L' setae 



\\'illi ei-ht luiiu' Betae "U eaeh side <>l .-aiidal appendaL''-. pl..".i;. 



Ii-s. 1 and .", ............... _'.*,. Cor y n n e u r a 1 m n a e 



' \\'illl a tuft iif li'HL' >e|ae nil each side; thi>raeie res| lira! ' M'V 



'r-an a sini]|e lin-er lil^e process, pi. "I. I'IL:>. ." and s 



.",1. II y d r i> I > a e n u s 

 < \Yilh three or four pairs <if slmrt setae, a |']ale-like Hieker or with a 



paddle 

 / I'lali-like su.-ker at i-audal end. pi..". I. li^s. M and l.j 



_".. T e 1 m a toget on (St Paulii) 

 <hl With two or three pairs of short setae <>r with paddle 



- Without thoracic respiratnry tuhes. Ahdoiuinnl se-nieiits with 



a fringe of consjiic-uous spines or setae or projections, pi. 48, 

 liiT.l.".. and j.l.r.o, fig.10 in I'.ul. f.s N. V. State Museum, 1'.>:: 



:;.">. D i a m e s a 

 37. T h a 1 a ssom y i a 

 [44. M e t r i o c n e m u s 



ee With respiratory tubes. Abdominal segments usually without a 

 fringe of prominent setae, pi. 124. fig.-4. also pi. 24, figs. 13, 14, 15 



."'.i. Cricotopus 

 41. O r t h o c 1 a d i u s 



The larva of T h a 1 a s s o in y i a c o n g r e g a t a (an European species) 

 has a labium like Diamesa waltlii. 



