Fig. 131. — Vranotaeuia sapphiritia. larva. A, apex of abdo- 

 men, lateral aspect; B. dorsum of head. 



Other mosquito larvae 



Toxorhynchites rutilus septentrionalis 



Abdominal segments 3-7 without lateral spine-bear- 

 ing sclerous plates (Fig. Ml A), sometimes seg- 

 ments 6 and 7 each with dorsal saddle; head oval, 

 with most of the dorsal hairs multiple (Fig. 127B) 



and with hairs of mouth brushes fine 



Orthopodomyia 



7. Teeth of lateral comb situated on the posterior margin 

 of a large sclerous plate that covers most of each 



Fig. 132. — Mansonia perlurbans, larva. 

 (After Matheson 19il; 



side of the eighth segment (Fig. 131/4); head 

 with 4 stout black spines situated djrsally (Fig. 

 131B). Lives among emergent plants in perma- 

 nent shallow water Uranotaenia sapphirina 



Teeth of lateral comb either on a small poorly defined 

 plate (Fig. 173/4), or not on a plate; head with 

 slender hairs situated dorsally ( Fig. 173B) 8 



8. Head with anterior portion square and with short 



antenna not reaching beyond front margin of head 



(Fig. 175B) Fsoraphora 



Head either with anterior portion rounded ( Fig. 

 174B), or antenna extending far beyond front mar- 

 gin of head ( Fig. 1 77 ) 9 



9. Air tube having a branched hair on each side at its 



base (Fig. 170.4-172^) Culiseta 



Air tube having no branched hair at its base ( Fig. 

 135/4, 163/4 J 10 



10. Air tube with several single or branched hairs on each 



side (Fig. 163/4-168^) Culex 



Air tube with only one single or branched hair on each 

 side (Fig. 143/4, 173/4), or with none 11 



11. Ventral brush of anal segment having several tufts 



that arise out of the ventral midline of the .sclerous 



ring (Fig. 173/4-174/4) Psorophora 



Ventral brush of anal segment with all tufts posterior 

 to sclerous ring ( Fig. 143/4 ) Aedes 



Key to Species of AEDES (Larvae) 



1. Anal segment completely ringed by sclerous plate 



(Fig. 133/4) 2 



Anal segment with sclerous plate not meeting below, 

 frequently forming only a dorsal saddle ( Fig. 136/4) 

 12 



2. Pecren extending beyond ventral tuft on air tube (Fig. 



13.3/4) 3 



Ventral tuft situated beyond end of pcctcn on air 

 rube (Fig. 135/4) 4 



3. Lateral comb consisting of an irregular single row of 



9 to 14 scales, each scale having a long apical point, 

 as in Fig. 138/4; all teeth of pecten forming an 

 even, closely spaced row ( not as in Fig. 1 38/4 ) . 

 Occurs during summer in temporary wo.idland 



pools tormentor 



Lateral comb consisting of a triangular patch of 25 or 

 more scales, each scale fairly evenly feathered around 

 apex; apical tooth of pecten situated some distance 

 from the remainder of the row (Fig. 133/4). Oc- 

 curs during summer in temporary po;)ls 



fulvu'5 pallcns 



4. Gills budlike, much shorter than anal segment { Fig. 



135/4). Occurs in summer in pools containing 



sulfur compounds sollicitans 



Gills at least as long as anal segment (Fig. 136/4), 

 frequently very long and each pointed at tip (Fig. 

 138/4) 5 



5. Gills with prominent tracheae and extremely long, 



about 10 times length of anal segment ( Fig. 148/4 ) ; 

 lateral comb with only a few scales. Occurs during 



29 



