204 Aves. 



Diego Garcia zusammenzufallen. Die Beschreibung dieser Form ist dem Verf. 

 augenscheinlich entgangen, denn sie ^vird mit keinem Worte erwähnt. 



C. E. Hellmayr (München). 



610) Eiley, J. H., A New Hummingbird of the Genus CJiJorostilbon 

 from Brazih In: Proc. Biol. Soc. Wash., Vol. 26, S. 63 — 64, März 1913. 



Neu: Chlorosülhon puruensis aus Hyutanihan, am oberen Purüs, West-Bra- 

 silien. Dieser Kolibri steht den bekannten C. prasinus daplme am nächsten, weicht 

 aber durch längeren Schnabel mit hellbrauner Mandibel, längeren Schwanz und 

 kleine Färbungsdetails ab, C. E. Hellmayr (München). 



611) Creizonach, E., Die Dronte. In: -44. Ber. Senckenberg. Xaturf. Ges., S. 5 — 10^ 

 2 ALb., 1913. 



Die beiden Abbildungen zeigen day Frankfurter Skelett von Didus ineptus L. sowlö 

 eine Reproduktion des zeitgenössischen Ölgemäldes dieses Vogels, das von Roelandt 

 Savery (1626) stammt und nun im Besitz der Kgl. Gemäldegalerie zu Berlin ist. 



Loeser (Dillingen a. d. Saar). 



612) Peimiiigtoii, M. E. and Robertson, H. C. Jr., A Study of the Enzyms 

 of the Egg of the Common Fowl. In: U. S. Dept. Agr. Bureau of Che- 

 mistry, Circular No. 104, S. 1 — 8, 1912. 



The lipase content of fresh eggs is quite low and it shows a fairly regulär 

 increase as the egg deteriorates. In the case of incubated eggs the increase in 

 lipase content with incubation is more noticeable in the case of fertile eggs thaii 

 in the case of the infertile, although in both cases it is very evident. A number 

 of determinations w ere made of the catalase content of incubated eggs, both fer- 

 tile and infertile. The increase in catalase is great in the first case and far less 

 in the second; in fact, in some cases infertile eggs, heated for several weeks, 

 showed little more catalase than the average for fresh eggs, Avhile fertile eggs, 

 at the end of a week, showed a catalase content ten times as great. The catalase 

 content of fresh eggs is somewhat variable. There is evidence, although it is not 

 conclusive, that in the fresh fertile egg it is higher than in the fresh infertile 

 cggj the eggs obtained in spring showing a higher enzym content than autumn 

 eggs. The former were found to be about 90 percent fertile, while the latter 

 were nearly 60 percent infertile. Again, the factor of the strength and vigor of 

 the hen in the early spring months may affect the catalase content of the egg. 

 It is generally conceded that early eggs give strong chicks, and they are also 

 most desirable for storage purposes. Several experiments have indicated that the 

 greater proportion of catalase is in the white of the &gg, although it is not ab- 

 sent from the yolk. 



A review of the literature regarding previous work on this subject is given. 



Pearl (Orono). 



613) Grinnell, J., Two new Eaces of the Pigmj' Owl from the Pacific Coast. 

 In: The Auk, A^ol. 30, Nr. 2, S. 222—224, April 1913. 



An der Pacifiscben Küste Nordamerikas leben nicht weniger als diei unterscheid- 

 bare Lokalfoimen der Sperlingseule, die einander geographisch vertreten. Zwei davon: 

 GJaucidium gnoma vigilante (Berge des südlichen Californien) und G. (j. sie artJti (V&ncouver- 

 Inseln) sind hier zum erstenmal beschrieben. C. E. Hellmayr (München). 



614) Irwin, W. >'., The Turkey as an Egg Producer. In: Amer. Breeders Mag^ 

 Vol. lU, Xr. 3, S. 204—208, 1912. 



The author believes it possible to bred turkejs which will produce 100 eggs per 

 jear. Because of the thicker shell and membranes they keep fresh much longer than 

 do chicken eggs. Pearl (Orono). 



