288 



GNATS OR MOSQUITOES — CHAPTER XII 



Species. 



Female. 



Male. 



An. minimus, Theob. 



,, puTictipennis, Say . 



,, Lindcsayii, Giles . 



„ atratipes, Skuse 



,, manUipcnnis, Meig. 



,, stigmaticus, Skuse.. 



,, bifurcatus, L. 



,, Walkeri, Thcob. . 



,, nigripes, Stseger 



Seriatim, 4 internal 



2 II 3 II 4, obliquely in- 

 wards 



Alternate, 4 internal 



Alternate, 2 || 4 



Alternate, 4 internal. . 



Seriatim, 4 much in- 

 ternal 



Alternate, 4 internal . . 



Closely alternate, 4 in- 

 ternal 



Alternate, 4 distinctly 

 internal 



Alternate, 4 internal. 

 Seriatim, but 3 near || 4. 



Alternate 2 distinctly in- 

 ternal. 



observations on which he bases this opinion are exphcable on 

 some such ground as that suggested. Still, it must be confessed 

 that amongst the forms described in the following pages, espe- 

 cially in the genus Gnlex, several instances occur in which a 

 difference in the formation of the tarsal claws is the only 

 character distinguishing certain species, and the close resem- 

 blance of some of these in all other essential points make it 

 quite possible that Coquillett may after all be right. 



For the purposes of identification, the points selected for 

 reference in the succeeding table, are as follows : — 



(1) The presence or absence of spots on the wings. 



(2) Where the wing is spotted, whether the continuity of 



colouring of the costa is interrupted or not. Where it 

 it is stated to be so interrupted, it should be understood 

 that purely apical spots, such as that on the tip of An. 

 Lindcsayii, tnihi, are not counted. Further, if the 

 lighter coloured portions be in excess the costa is 

 described as light-coloured, with dark interruptions, and 

 vice versa. As a rule, in all species so decorated, the 

 wing-field is spotted as well as the costa. 



(3) The presence or absence of Ught markings on the tarsal 



joints, and especially if certain joints be light-coloured 

 throughout. 



It will be noticed that there is one well-marked group 

 in which one or more of the hind tarsi are all white ; a 

 second, in which some or all of the tarsal joints have 

 distinct apical light bands ; and a third, in which the 

 tarsi are entirely dark tinted. At the same time, in 

 endeavouring to place a specimen from drawings and 



