654 Messrs. Sclater and Mackworth-Praed on [Ibis, 



M. horvs with a slightly forked tail and M. affi,nis without a 

 fork. M. c. streubeli differs from M. c. caffer only in its 

 slightly smaller dimensions. 



Tachornis parvus parvus. 



Cypselus jJarvus Licht. Verz. Donbl. 1823, p. 58: N.E. 

 Nubia. 



Tachornis parvus (Licht.) ; Reichw. V. A. ii. p. 283; 

 Butler, Ibis, 1905, p. 344, 1908, p. 239. 



[B. coll.] 2 Khartoum Apl. ; 1 Malakal May, U.N. 



[C. & L. coll.] 2 Jebei Ahmed Agha Jan. U.N. 



Widely distributed wherever Dom or Doleib palms occur. 

 The two eggs are glued to the bottom of the nest, which can 

 be turned upside down without their falling out (J.. L. B.). 



Famih' CAPRIMULGIDiE. 



Caprimulgus europaeus europaeus. 



C api'imulgus europceus Linn, Syst. Nat. 10th ed. 1758, 

 p. 193 : " Habitat in Europa & America,'' restricted type- 

 locality, Sweden; Butler, Ibis, 1905, p. 341. 



Caprimulgus europeeus eurupceus Hartert, Vog. pal. Faun, 

 p. 846. 



[B. coll.] 3 Khartoum Sept. 9-Oct. 25. 



Caprimulgus europaeus unwini. 



Caprimulgus unwini Hume, Ibis, 1871, p. 406 : west of 

 Kashmir. 



Caprimiilgns europaus unwini Hartert, Vog. pal. Faun, 

 p. 849. 



[B. coll.] 3 Khartoum Oct. 21 & 24. 



Both these forms of the Common Nightjar winter in the 

 Sudan, but we have no evidence of two other subspecies 

 recognized by Hartert, C. e. ineridionalis and C. e. sarudnyi, 

 both of which might be presumed to come to the Sudan 

 in winter. 



Another Nightjar, marked ••' ^ Khartoum 18/x./07," is 

 rather different from the others, being a good deal smaller, 

 wing 165 mm., against 178 and over in C. e. unwini. It 



