Male Genitalia. 7 



ccc. Pecten teeth almost black, about 20 in 

 number, with small basal dentitions, 

 comb scales about 25. 

 d. Pecten rows continuous, the large apical 

 spine of the comb scales being from 

 J to \ length of the entire structure... Culicada fitchii. 

 dd. Pecten with several isolated apical teeth. 

 e. Lateral hairs of first abdominal segment 

 double, detached teeth of pecten well 



spaced Culicada abfitchii. 



ee. Lateral hairs of first abdominal segment 

 single, apical pecten teeth only a 



little detached Culicada vittata. 



aa. Air-tube moderate in length, from about 

 2 to 4 times longer than its greatest 

 diameter, 

 b. Air-tube decidedly fusiform. 



c. Antennae long, anal segment long ; comb 



consisting of 6 or 7 sub-equal spines... Janthinosoma musica. 

 cc. Antennae moderate, apical portion black ; 

 anal segment short, wider than long, 

 with 4 pecten teeth on basal half of 



the air-tube Grabhamia jamai- 



censis. 

 aaa. Air-tube very short, not more than 1J to 2 



times as long as broad. 

 aaaa. No air-tube, or a very short one. 



d. Comb teeth of equal length Anopheles barberi. 



dd. Comb teeth of two sizes, long and short. 



e. Comb teeth with large branches between 



them Cellia albipes. 



ee. Comb teeth with only fine obscure pec- 

 tinations, 

 f . Secondary teeth of the comb less than 



half as long as the primary ones... Anopheles crucians & 



A. maculijpennis. 

 ff . Secondary teeth of comb over half as 



long as primary ones Anopheles punctipen- 



nis y A.franciscanus. 



THE MALE GENITALIA. 



The prominence now given to the male genitalia makes it 

 necessary to add a figure showing the different parts that are 

 important to notice. 



Roughly the external male genitals consist of two " claspers," 

 each of which has a large basal lobe (Fig. 2, bes.) and a variously 

 shaped terminal clasp segment (tes.) which folds over like the 

 blade of a knife. At the apex of this is found a more or 



