CELSTUBA. — CYPSELOIDES. 37^ 



The fact of there being a marked difference in the plumage between the sexes of this 

 species is a peculiarity in the family only shared by C. rutila of Guiana and Trinidad. 

 Dissected specimens proved that the male has the red collar, and that the female is 

 without it. 



The southern extension of the ran'ge of C. hnmneitorques reaches Ecuador, whence 

 we have seen several specimens ^. Its northern limit includes Southern Mexico, where 

 Mr. le Strange found it and where Sumichrast says that it is resident and breeds in the 

 State of Vera Cruz near Tuxpango and Orizaba ^, Senor Ferrari-Perez also found it at 

 San Miguel Moliuo in the State of Puebla. 



The only species at all nearly related to C. brunneitorgues is C. rutila (Vieill.) of 

 Guiana and Trinidad, and with which it was for some time confounded^. C. rutila has, 

 however, the chin as well as the cervical collar of a clearer paler rusty red, the dark 

 crown being more restricted posteriorly, and other slight differences. 



Mr. Hartert, in his Catalogue of the Cypselidse in the British Museum, removed 

 C. irwnneitorques and C. rutila from Chcetura, and placed them iu Gypseloides. As the 

 shafts of the rectrices are distinctly spinous, though perhaps hardly so much so as in 

 typical Choecura (in Gypseloides the points are not at all prominent), the two species 

 in question are best placed in Choetura. 



CYPSELOIDES. 



Cypseloides, Streubel, Isis, 1848, p. 366 ; Hartert, Cat. Birds Brit. Mus. xvi. p. 493. 



The shafts of the rectrices in this genus are not produced beyond the webs of the 

 feathers, and therefore the tail is not provided with the spiny points which form such 

 a conspicuous feature in Chcetura. Cypseloides thus to outward appearance much more 

 resembles the true Swifts, but it has the normal number of phalanges to the third and 

 fourth toes, so that it really falls into this section of the family. 



Mr. Hartert includes five species in the genus, but we think that C. rutila and 

 C. brunne^orques belong more properly to Chcetura. To the three remaining species 

 C. cherriei must be added, making four ia all, of which two occur within our limits. 

 The other two are confined to South America. 



1. Cypseloides niger. 



Sirundo apos dominicensis, Briss. Orn. ii. p. 514, t. 46. f. 3 . 



IKrundo niger, Gm. Syst. Nat. i. p. 1025 ^. 



Cypselus niger, Gosse, Birds Jam. p. 63 ' ; DI. Birds Jam. t. 10 *. 



Cypseloides niger, Scl. P.Z. S. 1865, p. 615 =; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 120^ 



Cory, Birds W. Ind. p. 140 ''j Hartert, Cat. Birds Brit. Mus. xvi. p. 494"; Cherrie, Auk, 



1892, p. 324'. 

 NepluBcetes niger, Sumichrast, Mem. Best. See. N. H. i. p. 562 " ; Baird, Brew., & Eidgw. N. Am. 



Birds, ii, p. 429 ". 

 Cypselus borealis, Kennerly, Pr. Ac. Phil. 1857, p. 302 ". 

 Cypseloides borealis, Scl. P. Z. S. 1865, p. 615 " ; Hartert, Cat. Birds Brit. Mus. xvi. p^ 495 ». 



