fr 



INSECUTOR INSCITI.T]; MHNSTRUUS 89 



5. Adjacent basal lobe, if present, small and setose, never produced 



with a single terminal spine A'cdes (Old World stock) 



Adjacent hasal lobe developed into an harpago, 



A'edes (New World stock)' 



6. Unci undivided 7 



Unci divided into two or more outwardly directed plates U 



7. Basal lobe conical with several terminal setae 8 



Basal lobe with a single stout rod, often produced Mansoniar 



8. Harpes very long, prominent; unci long, pointed Mcgarhimis 



Harpes and unci moderate 9 



9. Unci membranous, paired, with an outwardly directed basal 



chitinization CHmacura 



Unci cylindrical, chitinized, revolute 10 



10. Harpes normal, concave, with thickened margins and dentate tip, 



Orthopodomyia 

 Harpes modified, narrow, recurved, prominent Culiseta" 



11. Harpes few-toothed Culicella 



Harpes with a crown of spines Culex 



The genus Culex divides into two main sections on the 

 genitaHc characters. In the first, Culex proper, the harpes are 

 tufted at tip with numerous spines, and have a longer or 

 shorter hasal arm. The unci form three parts, later four by 

 subdivision of the original second plate. The first plate is 

 generally triangular and heavily chitinized, having a socket 

 near the middle into which a ligament locks that serves to 

 open the plates. This structure is first noticeable in Culicella 

 dyari (PI. Ill, fig. 2) where it is rather imperfectly developed. 

 The development in Culex (Jamcsia) concolor (PI. Ill', fig. 3) 

 is not much better. In Lutsia bigoti (PI. IV, fig. 6), the struc- 

 ture has improved and it can be seen fully developed in any of 

 the true Culex, as in the case of Culex (Culex) declarator 

 (PI. Ill, fig. -t). In Transculicia, the plate is thickened and 

 laminate (PI. IV, fig. 12). The second plate is seen in mem- 

 branous form in Culicella dyari (PI. Ill, fig. 2) ; in Jamesia it 

 has become chitinized (PI. Ill, fig. 3) ; in Lutzia, toothed 

 (PI. IV, fig. T)). This condition in intensified in the true Culex 



' Including Haemagogus and Psorophora. 



^ = Taeniorhynchtis Arribalzaga according to intention and description, but 

 not according to designation of type. 



• = Theobaldia Neveu-Lemaire, preoccupied by Theo'baldins Nevill. 



