Identification Keys 2 1 7 



Membrane not sharply receding and not touch- 

 ing side until some distance beyond end of 

 float. Knobs on narrow end : 2 distad, 3 

 centrad. (Fig. 21, b, page 100.). 



A nophclcs punctipennis. 



4. Eggs in rafts 5 



Eggs single 7 



5. Mass in zigzag string, mostly a double, never 



more than a third row in part. (Plate V., Fig. 



I, opp. page 194.) Mclanocoiiion atratus. 



Mass with 4 or more transverse rows 6 



6. Raft resting flat on water, ends not upturned. 



(Plate V., Fig. 5, opp. page 194). Culex tcrritans. 

 Raft upturned at ends. (Plate V., Figs. 2, 3, 4, 

 6, opp. page 194). . Culex rcstuans, Culex pip- 

 iens, Culex salinarius, Culiseta consobrinus, 

 Thcobaldia incideus, and Ochlcrotatus dupreei. 



7. Spines present 8 



Spines absent n 



8. Egg ovate 9 



Egg not ovate 10 



9. Width contained in length twice. Distinct knob 



on small end. (Plate VI., Fig. 6, opp. page 198.) 



Psorophora howardii. 



Width in length one and three-fourth times. 



Knob minute. (Plate VI., Fig. 5, opp. page 198.) 



Psorophora ciliata. 



10. Sculptured cells about as long as wide. Width 

 into length 3.8 times. (Plate VI., Fig. 1, opp. 



page 198) Grabhamia javiaicensis. 



Sculptured cells longer than wide. (Plate VI., 

 Figs. 2, 3, 4, op^. page 198.). . . .Janthinosoma 

 posticata, Janthinosoma varipes, and Grab- 

 hamia discolor. 



