Scales on the Abdomen, Wings, Halteres, &c. 



3. Spindle-shaped scales (figs. 3, 6). 



4. Flat scales similar to those on the head (figs. 3, 1). 



5. Long twisted scales (figs. 3, 8). 



Abdominal scales. In all " culex " mosquitoes and in one 

 " anopheles " mosquito (Aldrichia error, Theobald) the abdomen is 

 covered with overlapping flat scales. In some " anopheles " there 

 are no scales on the abdomen, in others a few small flat scales 

 occur in patches, and in others the abdomen is densely covered with 

 scales of various forms. 



Wing scales. In all mosquitoes the veins of the wings are 

 covered with scales which vary in shape and size in different 

 parts of the same wing, Mr. Theobald describes the following 

 forms as occurring on the wings of " anopheles " mosquitoes : 

 1, lanceolate (figs, 3, 9) ; 2, long and narrow ; 3, large and 

 inflated. On the wings of other kinds of mosquitoes some of the 

 scales may be very large, flat and much expanded (Panoplites 

 figs. 3, 5) ; broad and asymmetrical (Aedeomyia ) ; parti-coloured 

 and pyriform or inflated (Mucidus) ; or broad and elongated 

 ( Tceniorhynchus). 



Leg scales. In nearly all mosquitoes the legs are clothed 

 evenly w r ith flat scales, which form a complete covering. In a few 

 cases hair-like scales, which occur in tufts, may be present, as in 

 Sabethes. 



Scales on the proboscis, palpi, and antennas. The scales on 

 the proboscis are usually small and flat, but in some " anopheles " 

 they stand out very distinctly at an "angle to the surface (A. sinensis, 

 dc.). The palpi in some mosquitoes may also be densely scaled, as 

 well as the basal and first two or three of the following segments. 



Scales on the halteres. Mr. Theobald makes no mention of 

 scales being present on these structures, but their presence and 

 character can be readily made out in most species of " anopheles." 



In the classification of mosquitoes Mr. Theobald relies almost 

 entirely upon scale structure for the distinctions between different 

 genera, and in one case he has used this character alone for the 

 formation of a sub-family (Joblotina). The genus Stegomyia was 

 separated from the old genus Culex by reason of the fact that only 

 two forms of scales, viz., upright forked and flat scales, are present 



