218 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



4. Cordons extend 1/4 to more than 1/3 of body length (reported as 8 to 9 mm. 



in female) ; spicules at least 220 and 180/* long, may be 287 and 234/* long. 



Acuaria anthuris, p. 218. 



Cordons, if described, extend for length of not more than GOO/* ; if length 



not described (A. tenuis), spicules only 133 and 95/* long 5. 



5. Spicules 133 and 95/* long ; cloacal aperture 135/* from posterior extremity ; 



from Saxicola rubetra Acuaria tenuis, p. 225. 



Spicules longer than above (may be as short as 150 and 98/* long in A. pap- 

 illifera) ; cloacal aperture 150 to 400m from posterior extremity; not from 

 Saxicola rubetra 6. 



6. Male with 10 pairs of caudal papillae 7. 



Male with 12 pairs of caudal papillae 8. 



7. Vulva at middle or slightly in front of middle of body ; eggs 32/* long. 



Acuaria gracilis, p. 222. 

 Vulva posterior to middle of body ; eggs 37 to 39/* long. 



Acuaria subula, p. 224. 



8. Only male known ; 4.7 mm. long ; cordons 190/* long ; cloacal aperture 168/* 



from posterior extremity Acuaria papillifera, p. 224. 



Both sexes known ; male 10 to 11 mm. long ; cordons of male 280 to 320/* 

 long; cloacal aperture 300 to 400/* from posterior extremity. 



Acuaria cordata, p. 220. 



ACUARIA ANTHURIS (Rudolphi, 1819) Railliet, Henry, and Sisoff, 1912 



Synonyms. — Spiroptera anthuris Rudolphi, 1819; Dispharagus 

 anthuris Dujardin, 1845; FUaria anthuris (Rudolphi, 1819) 

 Schneider, 1866. 



Hosts. — Primary: Corvus glandamus, C. cornice, C. frugilegus, C. 

 corone; secondary : Unknown. 



Location. — Proventriculus. 



Morphology. — Acuaria sensu stricto (p. 216) : Lateral lips of 

 mouth strongly developed. Cordons unite at the margin of the 

 mouth and extend posteriorly 25 to 36 per cent of the body length, 

 according to Linstow (1873), or in the female 8 to 9 mm. posteriorly, 

 according to Schneider; they do not anastomose, according to 

 Schneider (1866) and Linstow (1873); later Linstow (1901), in 

 describing his Dispharagus invagin&Pw, writes that the cordons 

 anastomose and are recurrent as in A. anthuris; Railliet, Henry and 

 Sisoff define Acuaria as a subgenus, type A. anthuris, as with cordons 

 not anastomosing and not recurrent, so it may be assumed that this 

 is the case. The margins of the cordons lie in the cuticula. 



Male 10 mm. long. Caudal papillae total 10 pairs, with 6 pairs 

 postanal, according to Schneider (fig. 281), or total 12 pairs, accord- 

 ing to Linstow (fig. 282a); Schneider finds the relative position of 

 the fourth, fifth, and sixth pairs from the posterior end to be vari- 

 able, and the seventh and ninth pairs to be indistinct. The bladder- 

 like thickening of the cuticle which forms the caudal alae is again 

 divided longitudinally by a membranous wall which is cross-striated. 

 Spicules 220 and 180/* long (Linstow, 1873; lie says 22 and 18 mm., 



