176 THOMAS SAY FOUNDATION 



of segment 9, the hind margin evenly rounded. 

 Male genital hooks cylindrical, sharp; hammer 

 small, transversely oval; segments 8, 9 and 10 



above with short spines arenosa 



Second anal vein of hind wing 3-6 branched 3 



3. Crossveins numerous over the entire area in fore- 



wing beyond the cord ; usually a pair of trian- 

 gular dark spots on head behind the ocelli point- 

 ing inward. Female subgenital plate slightly 

 produced, hind margin even. Male genital hooks 

 flat, triangular, sharp; hammer transversely 

 oval ; segments 9 and 10 above with short 



spines abnormis 



Area beyond the cord in fore wing not entirely 

 filled in with crossveins ; no triangular spots on 

 head behind ocelli 4 



4. Head with a blackish spot covering the ocellar 



triangle; Eastern species 5 



Head usually pale or concolorous above includ- 

 ing the ocellar triangle (pacifica sometimes 

 with black over the ocellar triangle) 8 



5. With very few (1-4) crossveins in the area be- 



yond the cord; female subgenital plate evenly 

 rounded or somewhat excavated. Male genital 

 hooks flattened, triangular, sharp ; hammer 

 small, transversely oval, segments 9 and 10 



above with short spines 6 



With a larger number of crossveins in the area 

 beyond the cord ; female subgenital plate not 

 evenly rounded ; male genital hooks long cylin- 

 drical ; segments 9 and 10 above with short 

 spines, (male of trijuncta not known) 7 



6. Black spot over ocellar triangle rounded behind; 



female subgenital plate produced, hind margin 

 either evenly rounded, truncate in the middle, 



or somewhat excavated lycorias 



Black spot over ocellar triangle angulate behind ; 

 female subgenital plate produced, hind margin 



angulately emarginated in the middle 



carolinensis 



7. Subgenital plate of female produced somewhat 



and bearing two flap-like lobes. These lobes are 

 often found to be laid back over the plate so 

 that the plate appears to be more or less evenly 

 rounded internata 



