54 Zoologica: N. Y. Zoological Society. [I; 2 



debted for their descriptions, and the following most interesting 

 notes, to Dr. Vernon L. Kellogg of Stanford University. 



Concerning the Opisthocomus Mallophaga, Dr. Kellogg says: 



"The three species are : — 



1. Goniocotes curtus Nitzsch — heretofore taken from Opis- 

 thocomus and no other host. 



2. Lipeurus, sp. nov. — in the group clypeata sutura dis- 

 tincta, which group has been found heretofore only on maritime 

 birds ! 



3. Coljjocephalum sp, nov. — an extraordinarily spiny beast, 

 not much like anything else in the genus. 



"I am disappointed in finding these two new species. I 

 hoped to find known parasites that might, by their relationship 

 with other parasites, characteristic of the pheasants or the rails 

 or some other group of birds, be a clue to the indication of your 

 curious bird's plyletic affinities. 



"The one known species of parasite, the Goniocotes, belongs 

 to a group of Mallophaga best represented, and most character- 

 istically, on the pheasants. But the Lipeurus, although a new 

 species, belongs just as unmistakably with a group of Mallo- 

 phaga characteristic of such birds as boobies, albatrosses, cor- 

 morants, frigate-birds, pelicans and such strictly maritime 

 forms." 



Part VII — Field Notes in Venezuela. 



The first view which Mrs. Beebe and I had of living Hoat- 

 zins was two miles up the Rio Guarapiche, in south-eastern Vene- 

 zuela, where we found a flock of eight on March 27th, 1908. 

 Farther up we discovered three smaller flocks and later in the 

 day a large assemblage of twenty-five individuals. The natives 

 know them by the name of Guacharacas de Aqua and are well 

 acquainted with the musky odor which emanates from their 

 bodies. Being considered totally unfit for food, they are never 

 killed and as a result have become extremely unsuspicious. 

 The following notes were written in the field : 

 The moment our dug-out comes into view the Hoatzins an- 

 nounce their presence by hoarse, croaking cries; grating and 

 rasping to the ear like an unoiled wheel. Then, as we approach, 

 those nearest flop or crawl inward through the branches, making 

 a tremendous racket. This utterance has been termed a "hissing 

 screech" by some writers and although a very poor description 

 of the sound, no better one comes to mind unless it is a croaking 

 hiss. Buff on (13) tells us "Its voice is very strong, and it is less 

 a cry than a howl." Quelch (38) says "The cry of the Hoatzin 



