10 H. C. EFFLATOUN. 



of the stigmal callosity, there is very often the Costal hristle whieh 

 may be obsolète, more or less developed or eveii double. The shape 

 and size of the stigma is important as it may be short, long or very 

 long. RI usually bears minute and short hristles, as may R4 + 5 but 

 less often. The length, direction, form and position of the longi- 

 tudinal and cToss-veins and the form and length of the cells supply 

 very important characters and should always be taken into con- 

 sidération. The cells at the base of the wing are usually of large 

 size and the Cul cell, which is also large, présents an excellent 

 generic character in its inferior angle which is often drawn ont into 

 a point which, in some cases, is extremely long. 



The longitudinal veins are : 



The Costa (1) or Costal vein : ends at about R4 + 5 and is more 

 or less thickened and ciliated over its whole length. 



The Sub-costa (2), Auxiliary or Mediastinal vein : thin and 

 often short and indistinct, but it may be quite distinct. 



Radius 1 (3), Ist longitudinal or subcostal vein (RI) : variable 

 in length; it may not reach the radio-raedian cross-vein, it may 

 reach it or it may pass beyond it: it usually is bristly over its whole 

 length. 



Radius 2 + 3 (4), 2!id longitudinal or radial vein (R2-f3) : is 

 either straight, bent in the middle or wavy; more or less distant 

 from RI and very rarely bears a stump of vein. 



Radius 4+5 (5). 3rd longitudinal or cubital vein (R4h 5) : 

 usually bare, but sometimes bristly over its whole length, at the base 

 onlv or to the radio-median cross-vein; it may be straight or bent, 

 jiarallel or diverging from Ml, but very rarely converging towards 

 it; it is also more or less approximate to R2 + 3. 



Media 1 (6), 4th longitudinal or discoidal vein (Ml) : this niav 

 be straight or curved after the médian cross-vein. or it may l)e. 

 very rarely curved forward at the tip. 



' Media 3 + Cubitus 1 (7), 5th longitudinal or postical vein 

 (M3 + Cul) : usually bare, but very rarely bristlv over its whole 

 length and more or less diverging from Ml. 



Cubitus 2 + Analis 2 (8), analis, 6th longitudinal or anal vein 

 (Cu2 + 2ndA.) : less important, more or less long, reaching or not 

 reaching the hind margin. 



Awdis 3 (9) axilTaris or Axillarv vein (A3) : verv indistinct. 



The cross-veins are the following : 



The Humerai (10) or basai cross-vein : not important; situatcd 

 at the base and on the fore border between the costa and sub-costa. 



The Radio-median (11) small, anterior or médian cross-vein : 

 very important and situated towards the middle of the wing, be- 

 tween R4-h5 and Ml; it may be long or short; placed before, on, 

 or after the middle of Ist M2 cell; oblique or perpendicular. 



