88 NEW YORK STATE MUSEUM 



hh Full-grown larva over 6 mm. in length ; mandible not 

 ti'ansversely wrinkled 

 i Labium with its teeth rounded, pl.20, fig.9 



35. D i a m e s a waltlii.' 

 a Labium with its middle tooth broadly truncate 



37. T h a 1 a s s o ni y i a f u s c a 

 Note. — See addenda for several anomalous species. 



Pupae 

 a Puiia floats nearly motionless in a vertical position at the surface of the 



water, pi. 17, fig.ll ( Group Ccratopogon) 



(1(1 Pupa not as above 



1) Active pupa swimming with a jerking motion iji the water like a culex 



pupa, pi. 19, fig.8 (Group T any pus) 



M) Not culexlike 



c With long setae or filaments at caudal end 



(/ Caudal filaments very numerous and forming a caudal paddle, 

 pl.22, fig.l4, and pl.26, fig.15 

 c Thoracic respiratory organs a tuft of filaments, pi. 10, fig.2 



38. C h i r o n o m u s 

 ce Respiratory organs consisting of a main shaft with lateral hairs 

 or setae. Abdomen with .setae and bristles. 



42. T a n y t a r s u s 

 (Id Caudal appendage with long setae 



e With eight long setae on each side of caudal appendage, pl.SC). 



figs. 4 and 5 25. C o r y n o n e ii r a 1 e m n a e 



ee With a tuft of long setae on each side; thoracic re.spiratm-y 

 organ a simple finger-like process, pl.34, figs. 5 and 8 



81. Hydrobaenus 

 cc With three or four pairs of short setae, a plate-like sucker or with a 

 paddle 

 (I riatt^like sucker at caudal end, pl.34, figs. 14 and 15 



29. T e 1 m a t o g e t o n ( St Paulii ) 

 (1(1 With two or three pairs of short setae or with paddle 



r Without thoracic respiratory tubes. Abdominal segments with 

 a fringe of conspicuous spines or setae or pro.iectlons, pl.48, 

 fig.l3, and pi. 50, fig.lO in Bui. (58 N. Y. State Museum, 1903 



f35. Diamesji 



37. T h a 1 a s s m y i a 



44. ai e t r i c n e m u s 



ec With respiratory tubes. Abdominal segments usually without a 



fringe of prominent setae, pl.24, fig.24, also pl.24, figs. 13, 14, 15 



39. Cricotopus 

 41. Orthocladius 



'The larva of T h a 1 a s s o m y i a c o n g r e g a t a (an European species) 

 has a labium like D i a m e s a waltlii. 



