HELMINTH PARASITES OF BIRDS — DENTON AND BYRD 171 



genital pore. Mature ova dark brown, 38/a to 48/a long by 21;n to 28/* 

 wide, fully embryonated when oviposited. 



Hosts. — Pipilo erythrophthalmus (Linnaeus) (type) and Zono- 

 trichia alhicolUs (Gmelin). 



Habitat. — ^Liver. 



Localities. — North Carolina : Highlands (type) ; Virginia : Moun- 

 tain Lake ; Georgia : Athens and Augusta ; Texas : Houston. 



Type specimen: U.S.N.M. Helm. Coll. No. 37116. Additional speci- 

 men. No. 36758, from the white-throated sparrow. 



Remarks. — Brachylecithum nanum is described from specimens 

 from the livers of 9 (27.3 percent) of 33 red-eyed towhees, Pipilo ery- 

 throphthalmus ., collected at Highlands, N. C, and Mountain Lake, Va., 

 and from 4 (12.9 percent) of 31 white-throated sparrows, Zonotrichia 

 alhicoUis., collected in Georgia and Texas. Because of their delicate 

 structure and the difficulty w^ith which they are extracted, many speci- 

 mens were broken during removal. Other specimens, because of a 

 tendency to rotate a part of the body, are poor for detailed study. The 

 species shows a close relationship to no less than five of the already 

 described forms : B. flUiforme (Skrjabin, 1913) , B. mega^toma (John- 

 ston, 1917) , B. vanellicolae (Layman, 1922) , B. loossi (Layman, 1926) , 

 and B. asovi (Layman, 1926). Of these only B. filliforme is described 

 and figured in sufficient details to permit comparison with B. nanum. 

 From it B. nanum differs in being smaller and in having relatively 

 larger suckers, relatively larger testes, and a much smaller cirrus sac. 

 The type material of B. -111111 onne came from the gall bladder of a 

 hawk. Circus cyaneus. 



BRACHYLECITHUM GRUIS, new species 



Figure 36, e 



Diagnosis. — Body thin and semitransparent, greatly elongated, 

 tapering gradually at posterior end, measuring approximately 5.24 

 mm. long by 0.26 to 0.30 mm. wide at acetabulum. Cuticle without 

 spines or other obvious markings. Oral sucker subterminal, weakly 

 muscular, 0.25 mm. long by 0.23 mm. wide. Acetabulum weakly mus- 

 cular, approximately equal in size to oral sucker, 0.18 to 0.28 nnu. in 

 diameter, within anterior sixth of body. Pharynx globular, 0.09 mm. 

 in diameter. Esophagus narrow, thin- walled, about twice as long as 

 pharynx, bifurcating approximately midway between suckers. Ceca 

 slender, slightly wavy, passing laterally to gonads to terminate about 

 two-thirds the distance from vitellaria to posterior end of body. Ex- 

 cretory pore terminal. Genital pore median at intestinal bifurca- 

 tion. Testes distinctly lobed, approximately equal in size, 0.26 to 

 0.41 mm. long by 0.14 to 0.19 mm. wide : anterior testis separated from 



