An investigation on the cestode fauna of the common sparrow, Passer domesticus (Linnaeus) was carried out for about five years. In all 445 birds were examined during this period and only five species of cestodes were found to parasitize this bird: of these, three are known while two are new forms, the latter are the rarities. This part includes critical accounts of Choanotaenia passerina (Fuhrmann, 1907), Raillietine (R.) galeritae (Skrjabin, 1915) and Proparuterina lali sp. nov. - Choanotaenia passerina (Fuhrmann, 1907) has been previously studied by Fuhrmann (1907), Johnston (1909), Stunkard & Milford (1937) and Kintner (1938). The present study provides additional data. The writers find two rows of rostellar hooks in the present material. Fuhrmann and Johnston reported two rows of rostellar hooks, but Kintner apparently found a single row of rostellar hooks. Variations have been found in the number of testes and extent of cirrus sac. Amongst the previous workers, only Johnston (1909) paid attention to study the protective coverings present around the hexacanth and described two envelopes, but the writers find three. - Raillietine (R.) galeritae (Skrjabin, 1915) has been restudied and redescribed from fresh material. Previously Mahon (1958) studied this species from P. domesticus. The present account includes important variations and some additions too. Suckers have been found to be armed in contradiction to what Mahon stated. Gravid proglottides have been found to develop a velum. Egg capsules contain 3-13 eggs each. Two protective envelopes have been found around the hexacanth. This is the first record of the occurrence of this species in P. domesticus in India. Proparuterina lali sp. nov. is a rare parasite of Passer domesticus. Only one more species viz. P. aruensis Fuhrmann, 1911 is known. The present species differs from P. aruensis in the number and distribution of testes, bilobed nature and median position of ovary, position of vitellarium and of genital pore. The generic diagnosis of Proparuterina Fuhrmann, 1911 has been amended in the light of the morphology of the present species.