21. Ventral tuft situated near middle of air tube, as in Fig. 



141 A. Occurs during spring in grassy temporary 



pools flavescens 



Ventral tuft situated two-thirds distance along air tube, 

 as in Fig. 139/1. Occurs during spring in tempo- 

 rary pools, especially those with fairly high alkalinity 

 campestris 



22. Anal gills long (Fig. 156A), dorsal pair much longer 



than ventral pair. Occurs throughout the year in 



tree holes and shaded containers triseriatus 



Anal gills either as short as in Fig. 135/1 or all 4 gills 

 about the same length ( Fig. 142/1 ) 23 



23. Acus, a, of air tube detached from tube (Fig. 155). 



Lives in tree holes hendersoni 



Acus, a, of air tube a connected part of the air tube 



(Fig. 136) 24 



24. Head hair 5 with at least 5 branches and about the 



same size as head hair 7 (Fig. 142B); the 2 head 

 hairs 5 closer together than the 2 head hairs 6. ... 25 

 Head hair 5 with 4 branches or less; or the 2 head 

 hairs 5 no closer together than the 2 head hairs 6 

 26 



25. Head hair 5 some distance posterior lo head hairs 4 



and 6 ( Fig. 142B ) ; ciypeal hairs only as far apart 

 as the length of 1 hair. Occurs during spring 



chiefly in woodland pools canadensis 



Head hair 5 only slightly posterior to head hairs 4 and 

 6 ( Fig. 1 34B ) ; ciypeal hairs farther apart than the 

 length of 1 hair. Occurs during spring in the hol- 

 low bases of tupeio gum trees thibaulti 



156 



157 



Heads of Anopheles larvae. Hair numerals u.sei.1 on this plate arc those currently employed in the taxonomic literature on mosquitoes. 

 Fig. 156.— /4. barberi. (After Ross & Roberts 19-ii.) FiG. ns.— .<. puinlipeiniis. (After Ross & Roberts 1943.> 



Fig. 157.— /I. earlei (inner ciypeal hairs only). 1-IG. 159.— /^. ,/ud^lrimatulatus. (After Ross & Roberts 1943.) 



Fig. 160.— /4. ualkeri. (After Ross & Roberts 194 v) 



36 



