Evolution and Taxonomy 103 



extent. The clothing of the wings is also in an extremely 

 generalized condition, (see p. 93), and the larvae too represent 

 a generalized condition, having ten pairs of feet, three thora- 

 cic and seven abdominal. 



The coalescence of subcosta and radius of the hind wings 

 reminds us of what occurs in several of the more specialized 

 families. But these moths cannot be regarded as representing 

 the stem form of an}- of those families, as this coalescence takes 

 place here before there is any reduction of the anal areas, while 

 in the more specialized families referred to the anal areas are 

 reduced first. This group is represented by a single family.* 

 There are two North American genera Megalopyge {Lagoa) 

 and Carama. Family MEGALOPYGiDyE. 



GG. Moths in which the anal veins of the fore wings do 

 not anastomose in such a way as to appear to be branched out- 

 wardl3\ Three American genera, Acoloithus (Fig. 26), Tri- 

 procris (Fig. 10), and Pyroinorpha, fall under this head. 

 They will be discussed later, when the superfamily Zygce7iina 

 is reached. 



FF. Moths in which the subcostal cell of the hind wings is 

 not greatly reduced. 



G. Moths in which the anal veins of the fore wings anasto- 

 mose so as to appear to be branched outwardly (Fig. 22). 

 These are the Bag-worm Moths. They too show a general- 

 ized condition of the wings in the presence of three anal veins 

 in both fore and hind wings ; although in certain forms it is 

 difficult to make out all of the anal veins in the fore wings, as 

 the base of vein VIII is often wanting. The females have 

 lost their wings entirely. The peculiar type of venation of 

 the wings of these insects can not be regarded as representing 

 the precursor of any other known type. I therefore look upon 

 these insects as representing a distinct line of development. 

 The group is represented by a single family. 



Family Psychid^. 



* This family has been monographed by C. Berge. See Farrago Le- 

 pidopterogica. Contribuciones al estudio de la Fauna Argentina y 

 paises limetropes. An. Soc. Arg. XIII. See also Zool. Jahresbericht, 

 1882. This monograph seems to have been overlooked by American 

 writers. 



