220 Mr. T. D. A. Qod<i%v(i\\—Descnj)tions and Dimensions of the type (measured in the flesli) : — Head and body 135 mm.; tail 170; hind foot 32 ; ear 18'5. Skull : greatest lengtli 3S'6 ; basilar lengtli 29*5 ; condylo-incisive length 33"5 ; zygomatic breadth 19'6 ; interorbital constriction 6'8 ; squamosal breadth of brain-case 16*4; palatilar length 17'5 ; length of palatal fora-mina 6*5 ; alveolar length of upper molar series 6 ; length of upper molar series 5*5. Hub. Baringo, British East Africa. Altitude 4000 feet. Type. Old female. B.M. no. 10. 12. 19. 15. Original number 1383. Collected by Mr. Hobin Kemp on October 13th, 1910. Presented to the British Museum by Mr. C. D. Eudd. This Baringo gerbil appears most nearly related to the Somali species, 2\ pliillipsi, as is clearly shown by the simi-larity between the skulls of the two forms. The external colour-difference is however so marked that it is necessary to consider the Baringo specimen as representing a distinct dark-coloured race of pJiilippsi. In general colour this new form most nearly approaches T. dundasi, a species described by Wroughton from Mt. Elgon ; but umbrosa does not appear to be in any way closely allied to the Elgon gerbil, which is a very much larger animal, with a skull 45 mm. in length. XXII. — Descriptions and Records of Bees. — XLII. By T. D. A. CocKEKELL, University of Colorado. Megachile cetera, sp. u. ? . — Length about lOi mm. Black, with white and black hair, the broad abdomen with distinct white hair-bands. In nearly all respects like M. quinqaeUneata, Ckll., but the mesothorax and scutellum are minutely and densely rugoso-puuctate, the tegulre are rufo-fuscous, and the hair on the inner side of the tarsi is clear ferruginous. Hab. Nagambie, A'ictoria, 1910 {French) ^iy-^e; Gipps-land, Victoria {Froyfjatt) ; Sydney, N.S.W., one from F. Smith's collection, erroueouslv labelled M. niaculata, Smith; near Cooma, N.S.W., Jan.' 10, 1903 {Sc/hr). The specimen from near Cooma has no black hair on
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