3. Dististyle narro%v and sinuate, with a mesal row of 



bristles ( Fig. 117) ciliata 



Dististyle expanded near or beyond middle, without 

 mesal row of bristles (Fig. 119) 4 



4. Apical portion of claspette having two long slender 



filaments, each tipped with a long cu.rv.d s'-ine 



(Fig. 124) longipalpis 



Apical portion of claspette without su-.li filaments 

 (Fig. 121, 122) 5 



5. Apex of claspette with a series of simple setae or 



hairs and two flattened contorted leaflets at literal 



corner (Fig. 123) (^ 



Apex of claspette without contorted leaflets, at most 

 with scales and thickened hairs (Fig. 119, 121) 

 7 



6. Mescnotum golden scaled over its entire area. 



fere 



Mesonotum with mesal half black scaled, lateral por- 



FlG. 117 (upper). — Psorophora ci/iata, mile 

 genitalia. (After Matheson 1944.; 



Fig. 118 (lower). — Psorophora honardi, 

 male genitalia. (After A'atheson 1944.) 



tions white .scaled, the two colors forming longi- 

 tudinal bands h.)rrida 



7. Apex of claspette with a dense scries of hairs and 



scales (Fig. 119) cyanescens 



Apex of claspette with a series of only 4 to 8 long 

 thickened hairs (Fig. 121, 122) 8 



Q. Apex of claspette with 5 to 8 thickened hairs (Fig. 



121) confinnis 



Apex of claspette with 4 or 5 thickened hairs (Fig. 



122) discolor 



KEYS TO CULICIDAE LARVAE 



The chief parts named in these keys are illustrated in 

 Fig. 125 and 126; other parts are included in the dia"nostic 

 drawings illustrating the couplets. The mouth brushes are 

 omitted from head drawings except Fig. I29B. In draw- 

 ings of the air tube, except Fig. 165/4. 169/4. and \11A, 

 ventral tufts are shown for only one side. 



25 



