168 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



last follicles of vitellaria. Excretory pore terminal. Genital pore 

 median, one-half to two-thirds distance from oral sucker to acetabu- 

 lum, ventral to or slightly anterior to intestinal bifurcation. Testes 

 round to elongated-oval, equal in size, measuring 0.12 to 0.28 mm. long 

 by 0.08 to 0.16 mm. wide, situated one directly behind other, occupying 

 most of width of body. Anterior testis touching acetabulum or sep- 

 arated from it by one or two loops of uterus ; posterior testis contiguous 

 with anterior testis. Cirrus sac elongated-pyriform, 0.13 to 0.15 mm. 

 long by 0.05 to 0.06 mm. wide, containing coiled seminal vesicle, ejac- 

 ulatory duct surrounded by prostatic gland cells and eversible cirrus, 

 from one-third to one-half its length lying dorsally to acetabulum. 

 Ovary round to oval in shape, smaller than testes, 0.05 to 0.10 mm. long 

 by 0.07 to 0.10 mm. wide, located on midline immediately behind poste- 

 rior testis or separated from that organ by one to three loops of uterus. 

 Seminal receptacle larger than ovary, immediately posterior to ovary. 

 Vitellaria consisting of 8 to 10 medium-sized, ovoid follicles on each 

 side of body, occupying zone posterior to seminal receptacle. Uterus 

 much convoluted, filling body posterior to vitellaria, passing anteriorly 

 between and ventrally to vitellaria, ventrally to middle or to one or 

 other margin of ovary, dorsally between ovary and posterior testis, 

 dorsally to both testes and acetabulum, then following straight or 

 slightly undulating course to genital pore. Metraterm weakly muscu- 

 lar, equal in length to cirrus sac. Mature ova very dark brown, 

 embryonated when oviposited, 36/i, to 40/i, long by 21/a to 27/x wide. 



Host. — Wilsonia canadensis (Linnaeus) . 



Habitat. — ^Liver. 



Locality. — Virginia: Mountain Lake. 



Tyye specimen.— V.^:^M. Helm. Coll. No. 37117. 



Remarks. — BrachylecitJiuni tuberculatum is described from eight 

 specimens obtained from the liver of two of six Canada warblers, 

 Wilsonia canadensis, from Mountain Lake, Va. The species shows a 

 closer affinity to B. varum (Travassos, 1917) than to the other members 

 of the genus in that its body is covered with tuberculations. As com- 

 pared with this large robust species, B. tuberculatum is a small deli- 

 cate form that possesses differently shaped and more numerous tuber- 

 culations, inconspicuous ceca, proportionately larger testes, a different 

 type of vitellaria and a uterus which follows a different course in 

 ascending to the genital pore. 



BRACHYLECITHUM NANUM, new species 



FiGfBE 36, a^d 



Diagnosis. — Body much elongated-cylindrical, with weakly devel- 

 oped musculature and showing a tendency to be serpentine; it 

 measures 1.85 to 3.39 mm. long by 0.10 to 0,26 mm. wide, widest in 



