‘Recently published Ornithological Works. 485 
Some reference to Lillo’s Pseudocolopterus dinellianus (which 
is not known to the Count) may probably be found in that 
writer’s article on the birds of Tucuman which we noticed 
in 1903 (‘ Ibis,’ 1903, p. 422). 
56. Berlepsch on the Genus Elainea. 
[On the Genus Zlainta Sund. By Hans, Graf yon Berlepsch. Proc. 
IVth Intern. Orn. Congress, p. 372. | 
As a solid contribution to his promised monograph of the 
Tyrannide, Graf v. Berlepsch presents us with an elaborate 
essay on the numerous and complicated species of the genus 
Elainea *. 
After short disquisitions on the natural position, distribu- 
tion, habits, and nesting of these birds and a complete list 
of the literature of the subject, the author reviews the 
39 species recognised by him. The following species and 
subspecies have new names:—H. martinica caymanensis 
(Grand Cayman Isl.), H. m. compleva (Cayman Brac), EH. m. 
remota (Cozumel Isl.), E. pelzelni (Rio Negro), E. brachy- 
ptera (Colomb.), E. obscura tambillana (N. Peru), E. gaimardi 
guianensis (Guiana), /. gy. bogotensis (Colomb.), and FH. wridi- 
cata delicata (Bahia). A key for the more ready deter- 
mination of the species follows, then a table of their 
distribution, next a list of the species which have been 
erroneously referred to the genus, and lastly a list of those 
that are represented in the author’s collection. This is 
indeed a good piece of work. We wish that all other 
essays of the sort were equally complete. 
57. Bickerton on the Birds of Hertfordshire. 
[Notes on Birds observed in Hertfordshire during the Year 1906. By 
William Bickerton. Trans. Hertfordsh. N. H. Society, xiii. p. 49 (1907). ] 
Mr. Bickerton is able to add only one species to the list of 
Hertfordshire Birds in 1906. This is Leach’s Petrel (Oceano- 
* The author writes this word “ E/ainia,” but there can be no question 
that, its derivation being eAauveos (oleayineus), it is more correctly spelt 
‘6 Elainea,”’ as suggested by Cabanis and Heine. We cannot allow that 
errors ought not to be amended, See our author’s remarks on this point 
(footnote, op. cit. p. 883). 
SER, IX.— VOL. J. 2K 
