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Show 954 DR. G. HARTLAUB ON BIRDS [Nov. 29, Dr. Riebeck being still in India, the scientific compilation of the ornithological portion of his collection has been confided to me by Prof. H. Welcker, of the Anatomical Institution at Halle. It contains the following species:- I. SOCOTRA. a. PASSERES. 1. CISTICOLA INCANA, Sclat. & Hartl. Proc. Zool. Soc. 1881, p. 166, pi. xv. fig. 1. One adult male, agreeing in every respect with the specimen collected by Prof. Balfour. " Iris black." Gebel Firi. 2. LANIUS UNCINATUS, Scl. & Hartl. Proc. Zool. Soc. 1881, p. 168, c. fig. cap. One adult specimen. " Iris dark brown." Karegnigi. 3. ZOSTEROPS HABESSINICA, Guer. Zosterops haByssinica, Heugl. Orn. N.O.-Afr. i. p. 413; Hartl. Monogr. in Cab. J. f. O. 1865, p. 9; Scl. et Hartl. P. Z. S. 1881, p. 168. One adult specimen. " Iris greyish brown." Tamarida. 4. NECTARINIA BALFOURI, Scl. & Hartl. Proc. Zool. Soc. 1881, p. 169, pi. xv. fig. 2. Two adult males and one female are in the collection. " Iris brownish red." Karegnigi and Wadi Sjahi. 5. RHYNCHOSTRUTHUS RIEBECKI, n. sp. (Plate LXXIL) Supra fusco-cinerascens, pileo fuscescenti-nigro, frontem versus nigriore, gula fusco-nigricante ; macula majore regionem paro-ticam occupante circumscripte sericeo-alBa, nonnihil fulvescenti adumbrata ; remigibus primariis fuscis ; tectricibus majoribus remigumque tert. marginibus externis late et dilute fiavis, vit-tam longitudinalem valde conspicuam formantibus; scapula-ribus et tectricibus alarum minoribus dorso concoloribus; subalaribus albidofiavidoque variis; rectrice extima tota obsolete fusca, duabus intermediis fuscis, vix distincte flavido fimhriatis, reliquis fusco-nigricantiBus, marginibus externis late fiavis; subcaudalibus albidis ; pectore et abdomine griseo-fulvescenti- Bus; rostro nigro. Long. tot. circa 152 millim., culm. 14, al. 85, caud. 27, tars. 19. Fcem. Non diversa, exceptis pectore et aBdominepurius griseis. Of this second species of the Socotran genus Rhynchostruthus there is a fine adult pair in the collection. The species is quite typical in its structure, but very different in colour, and easily recognizable by the dark hue of the crown, the silky white spot on the |