Identification Keys 235 



49. Tuft situated slightly above middle of tube. 



(Fig. 52, page 249). 



Oclrferotatus infirmatus 

 Tuft two-thirds up tube. (Specimen very poor.) 



Oclrferotatus trivittatus. 



50. Last two or three spines on tube more widely 



separated than others 5 l 



Last two or three spines on tube not more 

 widely separated than others 54 



51. Comb of two irregular rows, less than fifteen 



teeth; tuftB three- or four-haired. (Fig. 33, 

 page 164.) 



Ochlerotatus sylvestris. 



Comb 3-rowed, more than twenty-four teeth, 



tuft B two- or three- haired 5 2 



52. With one terminal spine of the antenna well 



developed, the other spines not over one- 

 half its length, whole antenna rather heavily 

 chitinised, and not as long as the distance 



between the antennal bases 53 



With three terminal spines of each antenna well 

 developed and subequal, terminal one-fifth 

 of antennae with very heavy chitin, the rest 

 light, antennae as long as distance between 

 their bases Oclrferotatus aurifer. 



53. First two abdominal segments each bearing two 



long, single, lateral hairs. 



Oclrferotatus vittatus. 

 First two abdominal segments with one long 

 single and one double lateral hair, or with 

 two long double hairs on first segment. 



Oclrferotatus abfitchii. 



54. Tufts A and B of five or more plumose hairs. 55 

 Tufts A and B with less five than hairs each, 



simple or plumose 57 



