1. Antenna short, slender, and without definite tufts (Fig. 



175B) ; large predacious larvae 2 



Antenna long, stout, and with definite tufts (Fig. 

 174B); small to fairly large larvae which feed on 

 microorganisms 3 



2. Lateral hair of anal segment with 2 to 4 branches, 



separating at base of hair (Fig. 175/1) ciliata 



Lateral hair of anal segment single, or forked some dis- 

 tance from base howardi 



3. Antenna large and swollen (Fig. 173B), air tube small 



(Fig. 173/4); larvae greenish when alive. . .discolor 



Antenna not swollen (Fig. 174B), but air tube laige 



and swollen (Fig. 174B); larvae not greenish when 



alive 4 



4. Head hairs 5 and 6 multiple (Fig. 174B) . . .confinnis 

 Head hair 5 single or double, head hair 6 single to 



triple ( Fig. 176) 5 



5. Head hairs 5 and 6 single cyanescens 



Head hairs 5 and 6 double or triple (Fig. 176) 6 



6. Air tube about 2 times as long as greatest depth 



varipes 



Air tube 2.5 or more times as long as greatest depth 

 (Fig. 176) 7 



7. Head hairs 5 and 6 only slightly longer than head hair 



7 (Fig. 176) horrida 



Head hairs 5 and 6 nearly twice as long as head hair 

 7 (Fig. 177) 8 



8. Head hairs 5 and 6 each having branches of nearly 



equal length ferox 



Head hairs 5 and 6 each having branches of markedly 

 different lengths (Fig. 177) longipalpis 



KEYS TO CULICIDAE EGGS 



Eggs of mosquitoes may be recognizable to genus by 

 their grouping, color, size, shape, and surface markings. 

 To date, diagnostic characters to identify eggs to species 

 are available only for the genera Aedes and Psorophora. 

 Eggs to be identified should be submerged in water and 

 viewed at magnifications of 75 to 100 diameters in reflected 

 white light above a dull black background. 



Key fo Genera of CULICIDAE (Eggs) 



1. Eggs glued together in the form of floating rafts (Fig. 



178) 2 



Eggs found singly 5 



2. Surface of egg with many small raised nodules ( Fig. 



1 79) Mansonia perturbans 



Surface of egg without nodules 3 



3. Egg with frothy cap on posterior end (small end) 



(Fig. 180) Uranotaenia sapphirina 



Egg without frothy cap on posterior end 4 



4. Egg bluntly rounded at anterior end ( Fig. 181 ) 



Culiseta 



Egg cup-shaped at anterior end (Fig. 182) . . . Culex 



5. Egg strongly biconvex in dorsoventral profile; ratio 



of diameter to length not greater than 1:2 (Fig. 



185) 6 



Egg slender; ratio of diameter to length greater tiian 

 1:2 (Fig. 187) 7 



6. Egg in rot holes in trees 



Toxorhynchites rutilus septentrionalis 



Egg on soil subject to flooding Psorophora 



7. Egg in cavities of leaves of pitcher plant ( Sarracenta) 



Wyeomyia smith! 



Egg elsewhere 8 



8. Egg with pair of longitudinal membranous flanges 



(Fig. 183). Found in rot holes in trees 



Orthopodomyia signifera or alba 



179 



182 



Fig. nS. — Eg^ raft of Culex subgenus Culex. (Redrawn from 

 Mitchell 190"'.) ' 



Fig. 1-9. — Egg of Mamo'iia. (Redrawn from Mitchell 190".) 

 Fig. 180. — Egg of Uranotaenia. (Redrawn from Dyar 1901.) 

 Fig. 181 —Egg of Culiseta. (Redrawn from Mitchell 190".) 



Fig. 182.— Egg of Culex. (From Marshall 19i8.) 

 Fig. 18.1— Eggof br//iopo</ow>7<». (From Marshall 19.^8.) 

 Fig. 184. — Egg of Anopheles: A, lateral aspea; B. dorsal as- 

 peo. (From Hurlbut 1938.) 



44 



