248 



THE ENTOMOLOGIST. 



concluded with a double caesura. Finally the spots on the first 

 longitudinal vein are exemplified. 



It may sound a little complicated, but the absolute simplicity 

 of it will be seen by the following diagram of the wing-spots of 

 maculatus, and the formula which follows it. A long spot occu- 

 pying, say, five divisions, at I, m, n, o, p, can be shortened by calling 

 it P, which shows at once its position and length. Sometimes 

 a spot may be only one division in length, while it actually 

 occupies half of one scale division and half of another ; such we 



designate by, say, /— — /. 



Sometimes a spot occupies a little 



more than one scale division ; such can be shown by, say, jn + /. 

 The objection has been made to me that it is very hard in. practice 



Fig. ] . — Wing of Anopheles maculatus. 

 Formula : B = a/c/e 3 /? 5 /f 2 /v 2 //e 3 /i 5 //e 3 /m/p/f 2 /i/ 2 //. 



to divide up the costa by observation and to assign spots to the 

 definite divisions. This is much simpler than it seems, for all that 

 is necessary is to draw the wing and spots with a " drawing-eye- 

 piece," and then approximate a scale to the drawing and write 

 down the formula. 



The following are the win^ formulae of some cf our Malayan 

 anophelines : 



elegans B = a"Jd 2 lc//l^s^ X y/gmVq//d z lg"/!J^/s/u^ll. 



umbrosus W = o/y//nil//y//. ' 



barbirostris W = qtfJlgf^lPllll II- 



fuliginosus TV = &lgV\i?lzl\q^o*l\c^g*\h\n\iP\z\\. 



ludloivi B = a*ld/f*/ls/t*/^/f'/ls//b/yz/l/n + /t s !i///. 



karwari B = alc/e s ll e /t^///e 5 lc e //o/c!e 3 /l/^/q/t s /if/l. 



Foek-Cells. 



We frequently find such very indefinite descriptions as " the 

 first submargmal cell is a little narrower and much longer than the 



