88 NEW YORK STATE MUSEUM 



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

 ti'ansversely wrinkled 

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



35. D i a ra e R n waltlli.' 

 ii Labium with its middle tooth broadly truncate 



37. Thalassomyia fusca 

 Note. — See addenda for several anomalous species. 



Pupae 



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



water, pi. 17, fig.ll ( Group C c r a t n p o g o n) 



(Id Pupa not as above 



h Active pupa swimming with a jerking motion in the water like a culex 



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



hb Not culex like 



c With long setae or filaments at caudal end 



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

 pl.22, fig.l4, and pi. 26, flg.l5 

 c Thoracic respiratory organs a tuft of filaments, \AAC>, fig.2 



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

 C€ Respiratory organs consisting of a main shaft with lateral hairs 

 or setae. Abdomen with setae and bristles. 



42. T a n y tar s u s 

 (Id Caudal appendage with long setae 



e With eight long setae on each side of caudal appendage, pl.36. 



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



re With a tuft of long setae on each side: thoracic respiratory 

 organ a simi)le fingcr-liko process. \A.:'A. figs. 5 and 8 



31. H y d r o b a e n u s 

 re With tliree or four pairs of shoi-f setae, a plate-like sucker or with a 

 liaddle 

 d Plate-like sucker at caudal end, pi. 34, figs. 14 and 15 



29. Tel in a t o g o 1 o n ( St Paulii ) 

 (hi Witli two or three pairs of sliort setae or witli paddle 



r Without thoracic respiratory tubes. AlHlominal segments with 

 a fringe of conspicuous spines or setae or projections, pi. 48, 

 fig.l3, and pl.50, fig.lO in Bui. 68 N. Y. State Museum. 1903 



35. D i a ni e s a 



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



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



rr \\'iih respiratory tubes. Abdominal segments usually without a 



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



f 39. C r i c t o p u s 

 ^41. Orthocladius 



'The larva of Thalassomyia c o n g r e g ;> t a ( an European species) 

 has a labium like Diamesa waltlii. 



