terminol spine 

 DISTISTYLE 



apical lobe 

 BASISTYLE 



filomenl 



stem 

 bosal lobe 

 stout spine 



} 



CLASPETTE 



Fig. 65. — Diagram of the style ( basistyle and dististyle) and 

 claspette of the male genitalia, indicating the terminology used 

 for the parts. 



illustrating the couplets. Although some m.iles can be 

 identified by the set of keys designed for females (espe- 

 cially the key to genera), those males having minute 

 parts difficult to see can be more easily and reliably 

 identified by the set of keys presented in the following 

 pages. 



Key to Genera of CULICIDAE (Males) 



1. Fork of vein R-'..i close to apical margin of wing, 



cell R., only half the length of its stalk, R..a (Fig. 



7) .." 2 



Fork of vein R-.a much farther from apical margin 

 of wing, so that cell R^ is at least as long as its 

 stalk (Fig. 8) 3 



2. Palp short and inconspicuous (Fig. 18); wing less 



than 3.5 mm long; genitalia as in Fig. 69 



Uranotaenia sapphirina 



Palp long and massive ( Fig. 66 ) ; wing more than 



6 mm long; genitalia as in Fig. 72 



Toxorhynchites rutilus septentrionalis 



3. Mesoscutellum with apical margin evenly rounded, 



the hairs arranged evenly along it (Fig, 9); palp 



clavate ( Fig. 67) Anopheles 



Mesoscutellum with apical margin incised to form 

 a mesal lobe and 2 Literal lobes, with the hairs 

 grouped on these 3 lobes (Fig. 10); palp not 

 clavate 4 



4. Dististyle with many irregular lobes ( I"ig. 71 ) 



Wyeomyia smithi 



Dististyle either unbranched, as in Fig. 72, or with 

 only I or 2 simple lobes (Fig. 118) 5 



5. Apical spine of dististyle double, each ray short 



and stout (Fig. 114/1); phallosome without lateral 

 teeth at apex (Fig. 1 14B) Culiseta 



Apical spine of dististyle single, as in Fig. 72 6 



6. Apical spine of dististyle cone shaped, wide and 



truncate at apex, and with what appears to be a 



minute fringe along the edge (Fig. 70) 



Orthopodomyia 



Apical spine of dististyle either parallel sided or 

 tapering to apex, as in Fig. 68, 72 7 



7. Apex of basistyle continuing as a pointed lobe be- 



yond insertion of dististyle (Fig. 75) Aedes 



Dististyle situated at apex of basistyle, as in Fig. 72, 

 or truncate (Fig. 120) 8 



8. A subcylindrical projection (claspette) arising from 



near base of each basistyle and tipped with 1 or 

 more spines or processes (Fig. 76-100, 117-123) 



9 



Claspette not present (Fig. 74) 11 



9. Apex of claspette bearing a single sclerous process 



that is filamentous or bladelike (Fig. 76-100, 



124) 10 



Apex of claspette bearing a cluster of spines, one 

 of which may appear to be a process (Fig. 117— 

 123) Psorophora 



10. Claspette branched, with a long basal as well as 



apical branch (Fig. 124) Psorophora 



Claspette not branched or, at most, with basal branch 

 short ( Fig. 76-100) Aedes 



11. Dististyle bearing a long hook and a large mesa! 



membranous lobe (Fig. 118) Psorophora 



Dististyle without an accessory mesal membranous 

 lobe 12 



12. Basistyle with a shoulder or mesal lobe (c in Fig. 



105A) near apex, this lobe bearing a cluster of 

 specialized bladelike or spatulate spines, which are 

 frequently complex in structure (Fig. \^)^A, 

 lllA) Culex 



Pig. 66. — Toxorhynchites rulilus seploilrionjUs. male head. 

 Abbreviations: p. palp; pr, proboscis. 



Pig, 67. — Anopheles quaiirimacultitui. male head. Abbrevia- 

 tions: p. palp; pr. proboscis. 



15 



