Genus II. COTILE.
Clivicola, T. Forster, Syn. Cat. Brit. B. p. 55 (1817) ..... C. riparia.
Colile, Boie, Isis, 1822, p. 550 ..... C. riparia.
Range. Breeding in the northern parts of both the Old and New Worlds. The migratory species wintering in South America, as well as in India and Africa, where there are also resident species.
THE differences in nesting-habits and the colour of the eggs between the Sand-Martins and the Rock-Martins, which we have included under the one heading of Cotile, appear to us, on further consideration, to deserve generic distinction. The Common Sand-Martin (Cotile riparia), with its allies C. diluta and C. shelleyi, has a little tuft of feathers at the base of the hinder tarsus, showing an affinity to the House-Martins (Chelidon). C. congica, on the other hand, has no tarsal tuft of feathers, but retains the band on the fore neck, which makes it an intermediate species between the section containing Cotile riparia and C. shelleyi, and the little C. sinensis and its African allies, which have no throat-band. To the genus Cotile we shall refer all the Bank-Martins, which tunnel holes for their nests and lay white eggs, while to the genus Biblis will be referred the Rock-Martins, which lay spotted eggs, like the Swallows, and have also the Swallow-like character of a spotted tail. For those ornithologists who adopt the name Clivicola the following species will have to be included :—Clivicola riparia, C. diluta, C. shelleyi, C. cincta, C. congica, C. paludicola, C. minor, C. cowani, and C. sinensis.
a. Fascicula plumosa ad finem tarsi postici posita : torques pectoralis brunnea.
a’. Major : ala 4.25—4.35 poll.
a". Torques pectoralis obvia, saturate brunnea ..... 1. riparia, p. 13 .
b". Torques pectoralis vix obvia, pallide brunnea ..... 2. diluta, p. 63.
b'. Minor : ala 3.55 poll ..... 3. shelleyi, p. 65.
b. Fascicula plumosa ad finem tarsi postici nulla.
c’. Torques pectoralis brunnea.
a". Major: subalaribus albis : ala 5.0 poll ..... 4. cincta, p. 67.
b". Minor : subalaribus brunncis ..... 5. congica, p. 71.
d’. Torques pectoralis nulla ..... 6. paludicola. p.73. / 7. minor, p. 77. / 8. cowani. p. 79. / 9. sinensis, p. 81.
Genus II. COTILE
Genus II. COTILE.