708 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



The different species are very uniform in general appearance, l)ut 

 are not difficult to separate by small, but quite easily seen, characters. 



Thus Lord Walsing-ham pointed out" the value of the different posi- 

 tions of the white annulations of the antenna?, and sug'gested that the 

 species might be tabulated by that character alone. Aside from the 

 fact, however, that the tip of the antennae is about the most vulnera- 

 ble point, and often lost in a dry specimen, the white annulations are 

 not quite so constant as Lord Walsingham supposed, differing occa- 

 sionally in the same specimen. Nevertheless, the}^ furnish a valuable 

 help in the identification, and I have, in the following, given the col- 

 oration in all the species, where I know it, as it may eventually become 

 of more importance. 



The species described by the writer'' as Ch8inopferi/,r rnieUa was at 

 the time known only from a unique example with wings folded; even 

 this, however, hardly excuses the mistake of referring it to the pres- 

 ent genus; examination of the venation disclosed that the species does 

 not belong in this genus, but in the somewhat related genus Clwyxo- 

 cllsta Stainton, which thus for the first time is recorded from this 

 continent. 



The American species may be separated ))v the following table: 



TABLE OF SPECIES OF OOSMOPTERYX. 



Forewings with white markings on liasal half 1 



Forewings without white markings on l)asal half 12 



1. Basal half with short longitudinal white streaks onlii 2 



Basal half with longitudinal white lines 6 



2. Basal metallic margin of fascia nearly perpendicular on edge 3 



Basal metallic margin of fascia strongly oblique 5 



3. Dorsal edge white at base piilcherritnella 



Dorsal edge not white 4 



4. Apical margin of fascia nearly perpendicular chnDensella 



Apical margin of fascia strongly oblicjue grmrmferella 



5. Head and thorax with three prominent longitudinal lines (ittcnuutelUi 



Head and thorax with one faint central line ipomiviv 



6. Forewings with yellow or orange fascia 7 



Forewings without such fascia inilco/ori'lla 



7. Expanse of forewings less than 8 mm 8 



Expanse more than 10 mm 11 



8. Metallic spots surrounded by yellow <jii(i)Jrill)i('clla 



Metallic sjuits edging the yellow 9 



9. With black discal spots between first metallic sjxtt and fascia 10 



Without such black spot rJinliilmcUa 



10. Apical pair of metallic spots not touching eilges of wing (Iclicatella 



Both apical metallic spots reaching the edge mbmtelln 



11. Forewings light dra|)Colored .• fernaldella 



Forewing deep brown monticella 



1-2. Yellow fascia divided by longitudinal black streak nitens 



Fascia not thus divided rlandeatinelht 



a Insect Life, I, 1889, p. 289. '' Free. U. S. Nat. Mus., \XV1I, 15t04, p. 768. 



