42 Zoological Collections. Vertebrata. 



Length from the muzzle to the end of the tail, 2 feet, 7 inches ; length of the tail, 

 10 inches; of the ears, 4^ inches; height of the shoulders, 9^ inches ; of the 

 haunches, 9 inches, 10 lines. This beautiful fox is perhaps a little larger than 

 the Fennec ; it is known in Cordofan and Daifourby the name of Abou-Hossein ; 

 it burrows, and chases birds and small mammalia during the night. M. Rup- 

 pel took three individuals. 



7. PsAMMOMYS, a new sub-genus of Rodentia, with the following characters : 

 Dentes primores cestriformes, inferiores compressiusciilij molares obtusi, tri- 

 tores cemenlo nigro induciij supra infraque pari modo complicati, itd ut in 

 corona primi machceres rhombece tres, secundi dues, tertii una promineant. 

 Rostrum acutum, anlice compressum, apice oblique detruncatum ; labrum in- 

 tegrum ; sacculi buccales nulli. Auriculae mediocres rotundatce. Corpus jAlis 

 mollissimis tectum. Cauda corpore brevior, pilosa. Pedes ambulatorii, antice 

 digitis quatuor, verruca hallucari, postice pentadactyli ; ungues falculares. 



Dental formula. Incisores |, molars | = 16. 

 The rat which forms the type of this sub-genus, Psam. obesus (pi. 22, the ex- 

 ternal appearance, and pi. 23, the skeleton and dental apparatus,) is only found 

 in the sandy districts of Alexandria and the environs ; it burrows holes in the 

 sand ; lives in society ; seeks its food, which consists of roots, by night ; never 

 enters the habitations of men ; and apparently hibernates. The length of the 

 body, including the tail, 11 inches ; of the tail alone, 5 inches. 



8. Sciurus rutilus (pi. 24.) Corporis colore supra rutilo, pilorum hirtorum 

 apicibus albis, infr^ et podiis candide albis ; cauda corporis longitudine, disticha ; 

 auriculis brevibus,rotundatis. This species, which very much resembles Sc. setosus 

 Forster, or Sc. albovittatus Desmarcst, lives in the eastern part of Abyssinia, where 

 it burrows holes in the earth ; it is seen on little shrubs, but as soon as it finds it- 

 self perceived, it runs to its subterranean dwelling. According to the natives, it 

 feeds on the buds of trees. Total length, including the tail, 1 foot, 9 lines. 



9. Mus dimidiatus (pi. 13.) Corpore supra colore ex stramineo pallide refus- 

 cente; infra albo ; pilis tergi aculeatis — Length from the muzzle to the root of 

 the tail, 1 foot, 4 inches ; length of the tail, 4 inches. Inhabits the environs of 

 Sinai and Nubia, in cavernous places. 



10. Lepus isabellinus (pi. 20.) Corpore supra isabellino, infra albescente, 

 auriculis nudis, capite longioribus — Total length, 1 foot, 4 inches; of the head, 

 3 inches 3 lines ; of the ears, 5 inches ; of the tail, 2 inches 1 lines. Inhabits 

 the south-west of Ambukol. The Egyptian hare is found in Arabia, in Egypt, 

 and on the coasts of Abyssinia ; but this new species is only found in this par- 

 ticular locality. 



11. Antilope addax {^\. 7, male and female.) Corpore lacteo ; capite colore 

 cacaotico, quo coUum superinductum ; caprona frontali spadicea, cornubus ru- 



garum ambitu contortis, in leve fastigium exacutis, lyratis, jugulojubato Length 



from the muzzle to the root of the tail, 4 feet 4 inches ; length of the horns in a 

 straight line, 2 feet 2\ inches ; height of the body, 3 feet ; length of the tail, 1 

 foot. Inhabits the desert, south of Ambukol, as far as the Haraza Oasis. This 

 species is the same as that already described by M. Otto under the name of 

 A. suturosa, and by M. Savi as the A. gibbosa. It is not the true Strepsiceros 

 of Pliny ; but it is the species described by Mlian under the name of Addax. 

 M. Ruppell found the true Strepsiceros, that is to say, the animal described as 

 such by Pallas, on the coasts of Abyssinia. 



12. Antilope Soemmerringii (pi. 19, male.) Corpore supra colore isabellino, 

 pilis quasi sericatis, suturis undique implicatis nitescente ; infra splendide albo ; 

 facie, fronte fuliginose nigris ; toenia alba superciliari, basi cornu ad rhinarium 

 usque descendente; cornubus annulatis reclinatis, apicibus levibus infrorstim 

 flectis lyratis — Length from the muzzle to the root of the tail, 4 feet 6^ inches ; 

 length of the ears, 6^ inches ; of the horns, (measured according to their curva- 

 tures,) 1 foot 1 inch ; of the tail, 9 inches ; height of the shoulders, 2 feet 7 inches ; 



