AQUATIC INSECTS IN NEW YORK STATE 391 



10 With two anal blood gills; the two lateral combs of the air 

 tube wanting. Small species; found in water in the pitcher 



plant Aedes (smlthii) 



With four blood gills; with stellate hairs on the abdomen. 



Small specie's Uranotaenia (sapphirina) 



The southern genera Toxorhynchites, Megarrhinus and Con- 

 chyliastes are not included in the above table; their larvae have 

 never been described as far as I am aware. 



Pupae 



1 Swimming paddles, two pointed lobes [pl.40] Corethrella 



Swimming paddles rounded (la) 



la The respiratory tube of the thorax spindle-shape, pointed at 



the apex (2) 



Tube cylindric or trumpet-shape (3) 



2 Both inner and outer margins of the swimming paddles with 



reinforcing ribs, but without spine at the apex Corethra 



Only the middle rib present; last segment short, seventh 

 segment considerably longer than either the sixth or 

 eighth Mochlonyx (Btirope) 



3 Apex of swimming paddle ending in a small spine (5) 



Apex with a few cilia or short hairs (4) 



4 SmaU species 2 or 3 mm in length; last two segments with 



a thicli brush of . hairs on each side Aedes (smlthii) 



Large species, 7 or 8 mm In length Psorophora 



5 Large species at least 8 mm In length (6) 



Moderate or small sized species (7) 



6 Apex of swimming paddle ending in a short, sharp spine. . . . 



Pelorempis gen. nov. 

 Apparently without a spine (?), with a pair of stellate hairs 

 on the first abdominal segment Psorophora 



7 Thoracic breathing tubes much elongated, about 12 times as 



long as wide. Abdomen with a number of stellate hairs. . 



Uranotaenia (sapphirina) 

 Tubes not elongate i (8) 



8 Tube about as wide as long Anopheles 



Tube longer than wide Culex 



Imagos 



1 Proboscis short, not much longer than the head (2) 



Proboscis elongate, longer than the head and thorax talien 



together / (4a) 



2 Metatarsus longer than the following joint (3) 



Metatarsus shorter than the following joint. .Mochlonyx (Etirope) 



3 Species less than 4 mm in length; tarsal claws simple. (4) 



Large species, 10 or more in length; tarsal claws bifid 



Pelorempis gen. nov. 



4 Antennae verticilliate with hairs (i. e. in wliorls) Corethra 



Antennae wholly covered with hairs, legs densely hairy. . . . 



Corethrella 



