68 



bb. Dorsum of each abdominal segment covered with spines for about 

 one fourth its length, 

 c. Head without a prominent pointed projection; maxillae more 

 than half the length of the wings and longer than the pro- 

 thoracic legs; proximal part of the labial palpi not covered 



by the maxillae Marmara Clemens. 



cc. Head with a prominent projection ; maxillae never half the 

 length of the wings nor as long as the prothoracic legs ; labial 

 palpi covered by the maxillae at the proximal end. 



Cremastobombycia Braun. 

 aa. Dorsum of abdominal segments covered with spines of two sizes, the 

 caudal margins of the segments usually distinctly elevated; labial 

 palpi always covered by the maxillae at the proximal end. 

 b. Caudal end of body never with a distinct cremaster. 



Cameraria Chapman, 

 bb. Caudal end of body always with a distinct cremaster. 



Litkocolletis Hiibner. 

 Species of Gracilariidae examined : 

 Subfamily Gracilariinae 



Gracilaria negundella Chambers, sassafrasella Chambers, violacclla 



Clemens 

 Ornix prunivorella Chambers, crataegifoliella Clemens, conspic- 



uella Dietz 

 Parectopa salicifoliella Chambers, lespedezaefoliella Clemens 

 Subfamily Lithocolletinae 



Acrocercops vcnustella Clemens 



Leucanthiza ampliicarpeaefoliella Clemens, ostcnsackenella Fitch 



Marmara salictella Clemens 



Cremastobombycia solidaginis Frey and Boll 



Cameraria hamadryadella Clemens, ostryella Chambers, tubiferella 



Clemens 

 Lit ho colic 'tis lucidicostella Clem., argcntinotclla Clemens, tiliacclla 

 Chambers 



Family Phyllocnistidae 



This family is very nearly related to the Gracilariidae, and the 

 principal characters used to distinguish it are given under that family. 

 The arrangement of parts may be seen in Figure 67. It will be noted 

 that Phyllocnistis has long heavily-chitinized setae much as in the 

 Tischeriidae except that they are not forked at the tip. There is a 

 fleshy prolongation on each side of the tenth abdominal segment. This 

 family shows a somewhat higher degree of specialization in the pro- 

 thorax and labial palpi than most of the Gracilariidae. It is, however, 

 not as much specialized as the species of Lithocolletis which have de- 



