58 BIOLOGICAL SURVEY OF 



D. FURVA Nitz. Found on plovers and plialaropes. 



D. FUSCA Nitz. Occurs on hawks and eagles. 



D. GRACILIS Nitz. Found on purple martin. 



D. iLLUsTRis Kell. Occurs on red-winged blackbird. 



D. LATiRosTRis Bumi. Occurs on black-billed cuckoo. 



D. NEBULOSA Burm. Infests the starling. 



D. NORMiFER Grube. On the parasitic jaeger. 



D. OPACA Kell. & Chap. Found on semipalmated plover. 



D, ORARIA Kell. Occurs on golden plover. 



D. ORNATA Grube. Infests various gulls. 



D. oRNATissiMA Gicb. Occurs on red-winged blackbird. 



D. ORPHEA Osb. Occurs on catbird. 



D. PALLiDULA Harrison. Occurs on rose-breasted grosbeak. 



D. PRAESTANs Kcll. Occurs on terns. 



D. piCTURATus Osb. Occurs on meadow lark, 



D. ROTUNDATA Osb. lufcsts CrOW. 



D. SECOXDARiA Osb. Also infests crow. 



D. SIMPLEX Kell. Found on robin. 



D. STRAMiNEA Denuv. Occurs on flicker and other woodpeckers. 



D. TYRANNA Osb, Occurs on kingbird. 



Eallicola Johnston and Harrison 



R. cuspiDATA Scop. Occurs on coot. 

 R. BisETOSA Piaget. Occurs on rails. 



Ornitiiobius Denny 



0. CYGNi Linn. Infests swan. 



0. GoxioPLEURUs Denny. Occurs on the Canada goose. 



EsTHioPTERUM Harrison 



E. ANSERis Linn. Occurs on geese. 



E. ARDEA Linn. Found on herons and bitterns. 



E. BOTAURi Osb. Occurs on the American bittern, 



E, coLUMBAE Linn, Infests domestic pigeon, 



E, CRAssicoRNE Scop. Commoii on several species of ducks, 



E. ixFuscATUM Osb. Occurs on woodcock, etc. 



