THE GENERAL SUBJECT. 
Aves 13 
[Hartlaub, G.] On the Birds collected in Socotra and Southern Arabia 
by Dr. Emil Riebeck. P. Z. S. 1881, pp. 953-959, pi. Ixxii. 
Socotra yielded 20 species, 7 of which had not been obtained by I. B. 
Balfour during his short visit, and one, Rhynchostruthus riebecJci [Frin- 
gillidcej is described as new, and figured. South Arabia afforded 12 
species, of which the little known Merops cyanophrys \_Meropidtfi] and 
Chrysospiza euchlora \Fringillid(B\ are re-described. 
. See also Sclater, P. L. ; and Cisticola marginalise sp. n. 
[ Timeliid(tf\. 
Hatch, P. L. A List of the Birds of Minnesota. Ninth Ann. Rep. 
Geol. & N. H. Surv. Minn, for 1880-1881, pp. 3G1-372. 
Henshaw, H. W. On some of the Causes affecting the Decrease of 
Birds. Bull. Nutt. Orn. Club, vi. pp. 189-197. 
Storms are considered to be the principal cause : thousands of birds 
are driven against telegraph wires and lighthouses, and millions are 
annually swept out over the ocean, in which they fall exhausted and 
perish. 
. See also Podicipidce. 
Hess, W. Beitrage zur einer Fauna der Insel Spiekerooge. Abh. Ver. 
Brem. vii. (Birds, p. 134). 
From this island of the Eastern Frisian group, 19 species of birds are 
recorded. 
Hodek, E. Reise-Erzahluugen und Zugvogel-Wanderbericht von der 
unteren Donau aus dem Vorjahre. MT. orn. Ver. Wien, 1881, pp. 
67, 79, 85. 
Hoffmann, W. J. Annotated List of the Birds of Nevada. Bull. U.S. 
Geol. Surv. vi. pp. 203-256, with sketch map and illustrations. 
The Author’s own notes were made in 1871, to which are added the 
results of observations by Ridgway, Henshaw, and Cooper. The dis- 
tribution of vegetation in Nevada, as affecting that of the avifauna, is 
discussed at some length, with illustrations. 
Holdswortii, E. W. H. See Oreocincla varia '[Turdidai]. 
Holterhoff, E. [^^e., G.], Junr. A Collector’s Notes on the Breeding 
of a few Western Birds [Southern California]. Am. Nat. 1881, 
pp. 208-219. 
Holtz, L. Um und durch Spanien. Reiseskizzen, gesammelt auf einem 
im Jahre 1879 nach Spanien ausgefiihrten ornithologischen Reise. 
Wien : 1881, 8vo. 
Homeyer, E. F. V. Die Wanderungen der Vogel mit Rucksicht auf 
die Zuge der Siiugethiere, Fische und Insecten. Leipzig ; 1881, 8vo. 
[Not seen by Recorder.] 
