12 JOHN B. SMITH. 



of the larval habits of several of our species, and his interesting 

 paper is found in the Canadian Entomologist, xxx, 126, for May, 

 1898. The study of this branch of the subject may be safely left in 

 his hands. 



For the gift and loan of material in this genus I owe thanks to 

 Dr. L. O. Howard, Curator of the Department of Insects in the U. 

 S. National Museum, Prof. J. H. Comstock, Prof. S. A. Forbes, the 

 late Dr. J. A. Lintner, Dr. R. Ottolengui, Dr. William Barnes, Dr. 

 Roland Thaxter, Mrs. C. H. Fernald and the Messrs. Graef, Doll, 

 Bird, Goodhue, Hanham, MorFat and others of my correspondents 

 who responded liberally to my requests. 



It is to be regretted that I could not include the species of Gor- 

 tyna proper in this study; but I have found it simply impossible to 

 get any material whatever of either species. 



In tabular form the species may be arranged as follows: 



Table of the species of Hydrwcia. 



1 . Thorax with a loose tuft or small crest anteriorly ; the latter sometimes a little 



divided, hut never prominent nor transversely flattened ; primaries as a 

 rule moderate, in width or narrow, trigonate ; antennae various. 



hydreeeia 2. 



Thorax with a prominent, high anterior tuft, which is transversely flattened 



and a little divided centrally— somewhat resembling the blade of an 



adze ; primaries broad, large, a little excavated below the apex ; antennae 



of male simple papaipema 14. 



2. Primaries short, broad, stumpy 3. 



Primaries longer, trigonate, broadening regularly from base 4. 



3. Pale reddish luteous, with a slender, white lunule forming the reniform. 



albiluuata. 

 Deep, rich, purplish brown, the lower half of reniform outlined in white so as 



to form a small U ii-albuin. 



1. Antennae of male simple 5- 



An ten me of male with the segments marked and bristle-tufted 10. 



Antennas distinctly pectinated 13. 



5. Deep, somewhat smoky and mottled brown, ordinary spots narrowly outlined 



by white scales, fringes a little excavated on the primaries- . • .velata. 



Lighter brown or reddish, ordinary spots never ringed with white scales. 



though the spots themselves may be white; fringes of primaries even. .6. 



*i. T. p. line geminate, inner line crenulate or lunate, outer even, not followed 



by a pale shade *• 



T. p. line siugle, crenulate, the outer even line wanting, not followed by a 



pale shade &• 



T. p. line even, single, followed by a pale or whitish shade, or if geminate the 



included space is prominently pale- • • 9. 



7. Dark red-brown; reniform white; secondaries almost blackish. 



interoceauica. 



