434 Mr. E. Meyrick on the classification 



of the breadth of the stalk of the antennae ; thus cihated 

 (f ) means that the cihations are equal in length to two- 

 thirds of the breadth of the antennal stalk at the corre- 

 sponding point. The antennae are said to be ciliated 

 when they are furnished with short hairs arranged in a 

 single or double regular series. When these are long, 

 they are usually collected into small fascicles or bundles 

 at the joints, but are still arranged in a regular series. 

 They are often very short, and only perceptible with a 

 good lens, but it is extremely rare for them to be quite 

 absent in the ^ , though often said to be so by careless 

 observers. Sometimes in such a case the antennae are 

 called pubescent, but this is again quite a wrong use of 

 the term, which should only be used where the short 

 hairs (pubescence) are distributed over the whole surface 

 of the antennal stalk, not confined to a regular series ; 

 this structure is unusual. The maxillary palpi have 

 been much overlooked, even Lederer declaring them 

 absent in not a few cases where they are fairly developed ; 

 in nearly all the families they are almost always present. 

 When very short they lie at the base of the tongue 

 between the labial palpi, and are thus hard to perceive. 

 The abdomen of the S^ is usually furnished with a more 

 or less developed exterior apical tuft, called the anal 

 tuft ; but sometimes, as in Margaronia, there is a dense 

 exsertible interior tuft, attached to the genitalia, which 

 I have called the genital tuft. I have not used the 

 genital organs as generic characters, because, after 

 examining a good many species for this paper, I came 

 to the conclusion that those structures which I had 

 previously thought of value were not constant either in 

 families or genera ; often in closely allied species quite 

 extraordinary differences occur ; thus Talis may be 

 quoted as an instance of a genus where all the species 

 show a remarkable range of difference in the structure 

 of these organs. I cannot, in fact, give a single case of 

 two natural genera which could be separated by a point 

 of structure of the genitalia themselves. In the fore 

 wings vein 1 a, the lowest of the normal three free inner- 

 marginal veins, at first diverges considerably from vein 

 1^, but i:)rcsently curves round and runs directly into 

 1 h, where it terminates ; this structure appears constant, 

 but is often hard to observe, because the vein becomes 

 extremely faint and line towards its termination. This 



