375 



Crctidactylus Fitch and allied species in the North American 

 fauna are very similar to the type of Oidaematophorus, while palca- 

 ccHS Zell. and others are nearer to the type of Lcioptilus, but we find 

 such a complete transition of structure that we agree with Meyrick 

 in regarding them all as congeneric. Tutt's genera demantl little re- 

 mark with the exception of Emmelina, type monodactylus. This genus 

 is identical with the '\Ptcrophorus Auct., and in our opinion is not 

 worthy of separation, in spite of the rather distinct habitus of mono- 

 dactylus. 



The species of Oidaematophorus are not at all difficult to identify 

 when one has gained some familiarity with them. Usually some one 

 or two characters suffice, but we have found that very nearly all char- 

 acters of color and pattern are subject to such variation that the con- 

 struction of a key is very difficult. In order that the one presented 

 here may offer the fewest possibilities of confusion we have inserted 

 a number of species in two catagories. Only in this way have we been 

 able to make use of salient features of many species which are not 

 entirely constant. 



Key to the Speoes 



1. Palpi porrect, conspicuously longer than head, frontal tuft long. Very 



attenuate insects longifrous 



Palpi not conspicuously longer than head 2 



2. Primaries with a dark costal dot or patch above or just beyond base 

 of cleft, sometimes connected with spot at base of cleft to form an 



oblique patch 3 



Without such a mark; costa without spots or first spot near middle of 

 first lobe 35 



3. Primaries lemon yellow ; hind wings dark. Expanse about 24 mm. 



Costal spot very small some sulphurcndactyhis 



Primaries not lemon yellow ; if yellowish, expanse of insect less than 



24 mm or with conspicuous dark marks 4 



4. Gray or whitish species; posterior margins of at least part of the ab- 

 dominal segments with paired dorsal black dots 5 



Various. Abdominal segments with single spots if any ; sometimes 

 immaculate or with a different pattern 7 



5. General appearance dull brownish gray with some white scales on 



primaries inquinaius 



General appearance whitish or Hght gray with dark markings 6 



6. Smaller, 14-18 mm. Wings predominantly greyish below eras 



Larger, 17-24 mm. Secondaries usually more or less whitish below. .. ./>o« 



