SOME AMERICAN GEOMETRID MOTHS CAPPS 141 



transverse posterior line. As compared with the male, the fore 

 wing is usually more angulate, with the apex more produced and 

 the excavation between the apex and vein 4 deeper; the hind wing 

 has the outer margin more crenulute and more produced at vein 4, 

 and the transverse lines of both wings straighter and more sharply 

 denned. 



Alar expanse, 34-40 mm. 



Genitalia (fig. 31) : Ventral operculum strongly sclerotized; ventral 

 margin of genital opening bordered by a rather broad, straight band 

 with smooth anterior margin; ductus bursae broad anteriorly, nar- 

 row posteriorly and with the posterior internal band strongly sclero- 

 tized ; bursa copulatrix slightly scobinate near origin of ductus semi- 

 nalis; signum a large ovate, slightly concave plate with slender, spine- 

 like marginal teeth and few if any of the teeth bidentate ; central area 

 of plate with numerous spinules. 



Types. 8 — In United States National Museum (quercivoraria, No. 

 55720), British Museum (aeliaria) ; location unknown (textrinaria, 

 incongruaria) . 



Type localities. — "Amerique Septentrionale" (quercivoraria); east 

 Florida (aeliaria) ; "Atlantic District (Penn. !)" (textrinaria) ; Ham- 

 ilton, Canada (incongmavia) . 



Food plants. — Quercus. 



Distribution. — United States: Arkansas (June, July, Aug.), Illi- 

 nois (May, June, July), Mains, Massachusetts (Sept.), Minnesota 

 (June), Missouri (Aug.), New York (May), North Carolina (May), 

 Oregon (July), Pennsylvania (May, June, July), Wisconsin. 

 Canada: British Columbia (May, June). 



One hundred and thirty-six specimens examined. 



Remarks. — This species is one of the most variable in color and 

 lnacuiaiion yet studied, and the variation is greater among the males 

 than the females. 



6. BESMA QUERCIVORARIA ENDROPIARIA (Grote and Robinson) 



EUopia endropiaria Grote and Robinson, Ann. Lye. Nat. Hist. New York, vol. 

 8, p. 457, 1867.— Barnes and McDunkough, Check list of the Lepidoptera 

 of Boreal America, No. 4653, 1917.— McDunnough, Check list of the Lepi- 

 doptera of Canada and the United States of America (Part 1, Macrole- 

 pidoptera), No. 5144, 1938. 



Therina endropiaria Packard, Rep. U. S. Geol. Surv. Terr., vol. 10. p. 542, 1876 

 (generic transfer of EUopia endropiaria Grote and Robinson). 



Therina endropiaria (Grote and Robinson) Dyar, Psyche, vol. S, p. 407, 1899. — 

 Hulst, U. S. Nat. Mus. Bull. 52, p. 334, 1903. 



Therina fatuaria Strecker, Lepidoptera, Rhopaloceres and Heteroceres, indi- 

 genous and exotic, Suppl. 2, p. 8, 1899. 



8 The name trUinearia occurs only in Packard's key, quercivoraria being substituted for 

 it in the text. 



