Cla'^sijication of the Culicithe. 243 



No scales on the abdomen (very rarely there may 

 be a few scattered and inconspicuous scales on 

 tlie genital lobes) = Anopheles. 



Abdominal scales present, usually as a small out- 

 standing tuft on the ventral surface of the pen- 

 ultimate segment, rarely as a uniform covering 

 to the terminal segment = Myzorhyyichus. 



!The predoujiuant scales of the head are of the 

 " upright forked" kind (cuneiform) =; Nyssorhynchus. 

 The predominant scales of the head are not 

 " upright forked " = Chagasia. 



The species of Myzomia may be arranged in two iuter- 

 gvaduating series as follows: — 



a. The covering of the scutum consists mainly of 



hairs = Myzomyia. 



h. The covering of the scutum consists mainly of 



fiilculate scales = ^Tyretophorus." 



The species of Nyssorhynchus may be arranged in three 

 fairly distinct series as follows : — 



a. Abdominal scales present on a few of the distal 



segments = Nyssorhynchus. 



b. Abdominal scales scattered on all the segments. . = '^ Neocellia.'''' 



c. Abdominal scales fairly abundant on all the seg- 



ments, and also in outstanding tufts which may 



be either lateral or ventral = "Cellia." 



Tlie following are not included in the foregoing synopsis 

 or in the sequel : — 



1. Aldrichia error, Theobald. — One specimen, from India, 

 in the British Museum. As it stands it consists of the head, 

 thorax, wings, and appendages of a Myzomyia rossii, Giles, 

 to which the scaly dark-coloured abdomen of some other 

 species of mosquito has been attached. 



2. Bironella gracilis^ Theobald. — Described from three 

 males. 



The subgenus Anopheles shades into Myzorhynchus through 

 Anopheles separatus, Leicester, Anopheles vestitipenniSj Dyar 

 and Ivnab, and Anopheles grabhamii, Theobald ; it also 

 shades into Myzomyia through Anopheles gigas, Giles, and 

 Anopheles we.Ucomei, Theobald, and perhaps into Pyreto- 

 phorus through Anopheles atratus, Skuse. 



The subgenus Christya is essentially similar to Myzo- 

 rhynchus. 



16* 



