EVOLUTION OF COLOE PATTERN IN LITHOCOLLETIS. 117 



tubiferella (Fig. 65), aceriella (Fig. 66) and hamameliella (Fig. 67), these 

 fasciae are straight and but httle obUque. In tubiferella (Fig. 65), they are the 

 only white markings, except sometimes a very small white dot near the apex. 

 In aceriella (Fig. 66) and hamameliella (Fig. 67), there are, in addition, an 

 obhque white streak at the base of the dorsum, a longer obhque dorsal streak at 

 the tornus and a small white streak opposite it on the costa. Ostryarella (Fig. 

 6S) , corylisella (Fig. 69), CBSculisella (Fig. 70) and guttifinitella (Fig. 71) constitute 

 a closely related series, separated from one another by small differentiations. 

 In these species, the two fascise are bent outwardly below the costa, scarcely 

 enough to be called angulated. In guttifinitella, the pale streak at the base of 

 the dorsum is almost or sometimes entirely wanting. In lentella (Fig. 73) and 

 carymjoliella (Fig. 72), the fascise are distinctly angulated. 



In cincinnatiella (Fig. 75), macrocarpella (Fig. 74), saccharella (Fig. 76), 

 hamadryadella (Fig. 77), umbellularice (Fig. 78) and agrifoliella (Fig. 79), at least 

 one of the two white fascise has become acutely angulated. In hamadryadella 

 (Fig. 77) and umbellularice (Fig. 78) , the white fascia at the base is preserved to the 

 costa, although in umbellularice, it is almost separated into two parts. In agrifoliella 

 (Fig. 79), the position of this fascia is indicated by two patches of dark scales which 

 would form its external margin. In hamadryadella (Fig. 77), very complete 

 internal margins to the white fascise have developed; the ground color has, 

 however, shrunk away toward the base, so that the line of dark scales extends 

 through the middle of a broad white band. In cincinnatiella (Fig. 75) and 

 macrocarpella (Fig. 74), the two fascise are uniformly angulated; the white patch 

 at the base does not reach the costa. The costal arm of the first fascia of 

 saccharella (Fig. 76) is wanting, its dorsal arm is very obhque and confluent with 

 the oblique basal streak. 



A group of species compiking fl.etcherella (Fig. 80), arcuella (Fig. 81), betuli- 

 vora (Fig. 82), australisella (Fig. 83), bethunella (Fig. 84), chamber sella (Fig. Sb), 

 -cervina (Fig. 86), platanoidiella (Fig. 87), castaneceella (Fig. 88) said fasciella (Fig. 

 89) retains but the single median fascia, sometimes almost divided at its angle. 

 A pair of opposite oblique streaks represent the former complete fascia at the 

 basal fourth of the wing in the five first mentioned species of this group; in the 

 remaining five, the costal streak only is present. In castaneceella (Fig. 88) and 

 fasciella (Fig. 89), there has been an extensive progressive diminution in the white 

 markings; the median fascia is the only white marking remaining in fasciella. 



In gaultheriella (Fig. 91) and nemoris (Fig. 90), there is no median fascia; 

 instead of it a pair of costal and dorsal streaks. In nemoris, the first pair of 

 streaks meet, forming a fascia; in gaultheriella, they are separate. 



Lastly, there is that group of four species, in which a white longitudinal 

 streak extends from the base along the dorsal margin, reaching to or beyond the 

 middle. These are mediodorsella (Fig. 92), quercivorella (Fig. 93), ulmella (Fig. 

 95) and conglomeratella (Fig. 94). In the two former, this streak stops abruptly 

 at the middle of the dorsal margin; in mediodorsella (Fig. 92), it connects with 



