AMERICAN LEFIDOPTERA. 



47 



space inside of the basal line, by the very small dot between the 

 white orbicular and claviform, and finally by the shape of the reni- 

 forin, in which the center is never white and in which the inferior 

 portion is very much larger than the upper. In the secondaries 

 of this species there is no trace of maculation. Finally, and more 

 important than all, the sexual pieces are characteristic. While 

 the harpes agree in a general way with those of marginidens and 

 its allies, the clasper is absolutely unique. We have what may be 

 considered the typical hook ; but near its apex there arises a long, 

 slender, curved branch like the prong of a deer's horn. There is 

 nothing like this in the genus, and the species is therefore easily 

 recognized when a male is at hand. The range of size is as great 

 as that of marginidens, which it so closely resembles. 



Mr. Doll informs me that the larva of this species bores in the 

 young shoots of ash. 



Hydrflecia erepta Grote. 



1881.— Grote, Bull. Geol. Surv., vi, 267, Gortyna. 



1893.— Smith, Bull. 44 U. S. Nat. Mus., 175, Hydreecia. 



"A stout and rather aherrant form. Eyes naked; front unarmed; tibiae 

 unarmed ; feeble dorsal tuftings on the abdomen. Yellow. Fore wings dull 

 orange yellow with the lines fuscous, simple. The exterior well removed out- 

 wardly, a little waved between the veins. Half line present; interior line 

 uneven, a little outwardly projected below median vein. Claviform a simple 

 outline, incomplete. Orbicular concolorous, a small ringlet. Reniform small, a 

 white half-mooon in a blackish shade. Hind wings dull yellowish, with faint 

 discal mark and exterior line. Beneath dull yellowish, with faint exterior com- 

 mon line and discal marks. The insect is nearly concolorous ; fore wings and 

 thorax darker. An even terminal line on primaries. Antennae simple, ciliate 

 beneath. Expanse 34 mm." 



Douglas County, Kansas, Professor Snow. 



Synonomical List of the Species. 



HYDR(ECIA Gn. 



HYDRCECIA. 



1. H. albilunata Sm. 



lunata || Sm. 



2. H. u-album Gn. 



purpuripennis Grt. 

 baliola Morr. 



3. H. velata Wlk. 



sera G. and R. 



4. H. interoceanica Sm. 



5. H. atlantica Sm. 



nictitans J Auct. 

 americana Speyer. 

 lusca Harr., mss. 



6. H. paoifica Sm. 



7. H. juvenils Grt. 



8. H. imrnanis Gn. 



9. H. stramentosa Gn. 

 10. H. obliqua Hare. 



TEANS. AM. ENT. SOC. XXVI. 



MAY, 1899. 



