March, 1917-] FoRBES : HydRIOMENIN^ OF THE UnITED StATES. 63 



in repose. Apparently related to typical Hydriomena (South Amer- 

 ica). 



PercnoptUota ( ?) : Costa arched, apex marked, antennae laminate, 

 mdcv. short; 2 ace. cells; fore wing marked with fine striations; no 

 coremata multiferata. 



Rhodometra (Sterrha) : One small accessory cell not reaching 

 end of discal cell, as in the Sterrhinae (Europe, etc.). 



Analysis of Hydriomena as restricted above : 



I. Middle discocellular vein of hind wing bent sharply, and longer than lower 

 discocellular, or rarely about as long, but markedly bent {aurata Pack.). 



Series I. 



2. Male antenna doubly bipectinate, §1 firmata (Europe). 



2. With broad oblique pectinations, plumose, §2 turbata (Europe). 



2. Moderate normal pectinations, not extremely oblique. 



3. Markings of fine lines as in Ortholitha, §3 (Larentia). 



clavaria Haw. (Europe). 

 3. Markings of widely spaced lines as in typical Hydriomena, §4 



(Carptima) hydriomeniata. ' 



2. Antennae spatulate-subpectinate, §5 vespertaria, aqueata (Europe). 



2. Antennae heavily serrate and fasciculate. 



3. Otherwise like typical Hydriomena, with R, short, anal angle 



rounded over, etc., §6 (Ersephila) grandipennis, indistincta. 



3. Wings short with marked anal angle, one ace. cell . . . . Eurhinosea. 

 2. Male antennae laminate, ciliate or nearly simple. 

 3. One ace. cell, palpi fairly long and beaklike. 



4. Male antennas nearly simple and heavily but very shortly 

 ciliate ; anal angle of fore wings not distinctly marked ; gray 



without strongly contrasting markings, §7 georgii. 



4. Male antennae deeply laminate (prismatic) ; anal angle inter- 

 mediate, markings strongly contrasting, deep brown, sug- 

 gesting Eustroma reticulata, §8 atrocolorata. 



4. Male antennae laminate, anal angle well marked, black and 

 white species (except for suffused arctic specimens), §9 



(Rhetimaptera) hastata. 



3. Two ace. cells. 



4. Inner edge of fore wing generally much longer than outer, the 

 anal angle not well-marked, palpi often long and beak- 

 like, R2 generally short. 

 5. Male antennae deeply prismatic. 



6. Uncus simple ; with a heavy hook on inner side of 

 clasper; small fragile species generally associated 

 with conifers, §10 (Thera). 

 juniperata, variata, cupressata (Europe), simu- 

 lata (Holarctic), contracta (Am.). 



