REVISION OF THE OECOPHORIDAE — CLARKE 209 



PSILOCORSIS OBSOLETELLA (Zeller) 



Plate 22, Figure 133 ; Plate 40, Figure 220 



Crypfolechia obsolctcUa Zeller, Verb, zool.-bot. Ges. Wien, vol. 23, p. 242, 1873. — 

 Chambers, U. S. Geol. Geogr. Surv. Terr. Bull. 4, p. 137, 1878.— Walsikgham, 

 Ins. Life, vol. 2, p. 151, 1889. — Riley, in Smith, List of the Lepidoptera of 

 Boreal America, No. 5221, 1891.— Busck, in Dyar, U. S. Nat. Mus. Bull. 52, 

 No. 5849, 1903 ; Proc. Ent. Soc. Washington, vol. 5, p. 206, 1903.— Meyeick, in 

 Wytsman, Genera insectorum, fasc. 180, p. 197, 1922. — McDunnough, Check 

 list of the Lepidoptera of Canada and the United States of America (Part 2, 

 Microlepidoptera), No. 8471, 1939. 



Psilocorsis ohsoletella (Zeller) Busck, Proc. U. S. Nat. Mus., vol. 35, p. 197, 

 1908. — Barnes and McDunnough, Check list of tlie Lepidoptera of Boreal 

 America, No. 6426, 1917. — Forbes, Cornell Univ. Agr. Exp. Stat., Memoir 68, 

 p. 236, 1923 ; in Leonard, Cornell Univ. Agr. Exp. Stat., Memoir 101, p. 545, 

 1928. 



Psilocorsis quercicella Ke^^rfott, part (not Clemens) in Smith, Check list of the 

 Lepidoptera of Boreal America, No. 6390, 1903. 



This species is much like quercicella, but the fuscous shading 

 before the tornus extends entirely across the wing in the form of a more 

 or less conspicuous band. The fuscous markings of the fore wing 

 are longer, narrower, and more numerous. The abdomen is light 

 grayish fuscous above. All other characters practically as in 

 quercicella. 



First abdominal segment of male with well-developed hair pencil. 



Male genitalia. — Harpe rather heavily clothed with hairs ; sacculus 

 narrow, ill defined, weakly sclerotized. Anellus a weakly sclerotized, 

 more or less oval plate with a small crescent-shaped base; lateral 

 fingerlike lobes slender, small. Aedeagus stout, sharply bent, acutely 

 pointed; vesica armed with one long stout cornutus and a patch of 

 small spiculate cornuti. Gnathos very broad, strongly spined lat- 

 erally, weakly spined ventrally. 



Female genitalia. — Genital plate membranous except for a nar- 

 row, sclerotized anterior band; ostium small, round. Ductus bursae 

 membranous except for a narrow sclerotized band before ostium and 

 a sclerotized, dilated portion well before the inception of ductus 

 seminalis. Inception of ductus seminalis just before the sclerotized 

 band which precedes the ostium. Branches of signum 19 to 20 on 

 each side ; the entire inner surface of the signum-bearing half of the 

 bursa copulatrix strongly spiculate. 



Alar expanse, 13-17 mm. 



Type. — In the British Museum. 



Type locality. — Ohio. 



Food plant. — Oak; chestnut? 



Distrihuti/yn. — Eastern and southern United States. 



286614—41- 



