194 TAPEWORMS OF HARES AND BABBITS— STILES. vol.xix. 



1884, Subg. Microtcenia,^ Sedgwick, in Glaus & Sedgwick, Elementary Text-book 



of Zoology, I, p. 336, 

 188G, CiintouM, K. Leuckaih-, Die Parusiten des Mensthen, 2(1 ed., I, p. 825. 

 1886, Group Cyxioidotivnuv, Kailliet, TJc^meuts de Zool. mt^d. et agric, p. 253. 

 1896^ DipyUdiina-, Kailliet, Recucil de yi6(i.. V(5t., 8 ser., Ill, 5, p. 159.— Stii.es, Ikill. 



12, Bureau of Animal Industry, U. S. Dept. Agric, 1896, p. 28. 



J)la(jnosh. — Ta'uiidiv with rostelluin wliicli is generally iiriiied ; o-eni- 

 tal pores lateral (marginal), single or double; eggs with thin transparent 

 shells, frequently arranged in egg sacs, in some cases scattered through 

 the segments ; larval stage a cysticercoid ; adults in birds and mam- 

 mals. 



Type. — JHpylidium, R. Leuckart, 18G3. 



Genus DAVAINEA, R. Blanchard & A. Railliet, 1891. 



1891, Darainea, E. Blanchaiid A: Railliet, ^Um. Soc. zool. France, IV, p. 428. 



Type, Tan'm progloitina, Davainc, 18(30. 

 ?1893, Chapmania, Monticelli, Naturalista Siciliano, Xll (7-8-9), pp. 10-19. Type, 

 Tatiia argeniina, Zschokke, 1888. 



Diagnosis. — Dipylidiinaj of small or medium size. Head surmounted 

 by a rostellum or hollowed by a depression, but armed in either case 

 with a double row of numerous small hooks of special form (prong and 

 dorsal root short, ventral root very long, giving to the hooks the form 

 of a hammer). Suckers bordered with several rows of small hooks 

 which may be instable or persistent. (Genital pores unilateral or irreg- 

 ularly alternate; In the former case the ova are generally arranged in 

 egg capsules; in some species the ovary develops into uterus; eggs may 

 also be isolated, scattered tlirough the parenchyma. 



Tyijc.—navaineaproyloUlna (Davaine, 1800), R. Blanchard, 180;]. 



Habitat.— XdnM^ in intestine of birds and mammals; cysticercoids, 

 generally in arthropods and mollusks. 



This genus is found chietly in birds, but two species have been 

 recorded in mammals, besides the two species here given for Lcpus. 

 The diagnoses of the two other forms, which are introduced for com- 

 parison, read as follows : 



DAVAINEA MADAGASCARIENSIS (Davaine, 1870), R. Blanchard, 1891. 



1870, Tmua madagasvariensh, Daaaine, M6m. Soc. Biol. Paris, 5 ser., I (1869), 1870, 



pp. 233-2-10, pi. I 

 1891, iMvainea mada<jascaricmis (Davaine, 1870), K. Blaxciiaki., M6m. Soc. zool. 



France, IV, pp. 429, 438. 



Diagnosis. — Davainea madaga scar tens is (Davaine, 1870), R. Blanch- 

 ard, 1801. Strobila attains 250 to 300 mm. in length, and is formed of 

 500 to 000 trapezoidal segments which are broader than long. Head 



iThe subgenus Microtcvnia of the genua Twnia contains the species Tania ciicn^ 

 merina, T. eUiptica, T. nana, and T. fiavo-punctata, and is thus antedated by the genera 

 Dipylidium, Leuckart, 1863, Diphicanthns, Weinlaud, 1858 (nee L. Agassi/.), ami 

 HiimenohpiH, Weinlaud, 18,58, but tlie type has never been proposed. In order m 

 detinitely dispo.se of tlic geuus I propose Tania cuciimerina {— Tania canina) as typi , 

 ihus making Microtania a syuouyni of Dipylidium. 



il 



