1930 ] Key to the Mosquitoes of New England 
235 
4. Cross veins tending to lie in line, or mesonotum with 
bare impressed discolorous lines or both. .. Theobaldia 
Cross veins normal, mesonotal integument without 
impressed discolorous lines 5 
5. Abdomen of female blunt, with short cerci 6 
Abdomen of female pointed, cerci exserted 7 
6. Wing scales normal Culex 
Wing scales distinctly large and broad Mansonia 
7. Abdomen of female with the eighth segment wholly 
retractile, nude; spiracular bristles present 
Psorophora 
Abdomen of female with the eighth segment only 
partially retractile, spiracular bristles absent.. Aedes 
Larvse 
1. Eighth segment of abdomen provided with a distinct 
elongate dorsal siphon or respiratory tube 2 
Eighth segment without a distinct elongate dorsal 
siphon Anopheles 
2. Anal segment without ventral brush Wyeomyia 
Anal segment with ventral brush 3 
3. Air tube without pecten Mansonia 
Air tube with pecten 4 
4. Air tube with several pairs of ventral tufts Culex 
Air tube with a single pair of tufts 5 
5. Head elongate, elliptical Uranotxnia 
Head nearly circular or transverse 6 
6. Air tube with tufts close to base Theobaldia 
Air tube with tufts near the middle or beyond 7 
