146 Proceedings of the Biological Society of Washington. 



having chevron-shaped black markings in the gular region of the males 

 instead of having a throat which is wholly black, as in the other race. 

 Since specimens in the Museum from Zanzibar and the Guaso Nyiro dis- 

 trict in British East Africa show a perfectly transitional condition so far 

 as the color of their throats is concerned, it seems best not to consider the 

 two races distinct species, but to follow Werner (1. c, p. 1838) in using 

 a trinomial for the Sudanese specimens. The other characters separat- 

 ing the species are not apparently very important, and probably vary. 

 Unfortunately I have no specimens of /,. capensis to study in connection 

 with these specimens. 



Agama spinosa Gray. 



Dr. Phillips and Dr. Allen met with this species commonly throughout 

 their journey, and it was apparently the only member of the genus that 

 they procured. The series preserved consists of 6 specimens from Singa, 

 4 specimens from Gabbardi, and 8 specimens from Fazogli. These spec- 

 imens are, for the most part, of small size, the largest specimen being 

 but 200 mm. long, though part of the tail is lacking. Owing to the 

 coloration of many of the individuals, which very frequently is like that 

 described by Boulenger for A. hartmanni Peters (Cat. Liz. Brit. Mus., I, 

 1885, p. 340), I supposed at first sight that 1 had to do with this species. 

 All the examples before me, however, have the enlarged occipital, and 

 otherwise agree with the description of this species as given by Boulenger 

 (1. c, p. 355). 



Werner has contributed recently a long discussion regarding the status 

 oiA. hnrtmanni Peters in relation to A. doriae Boulenger and A. colo- 

 norurn Daudin. From what he writes, it is somewhat difficult to gather 

 whether he considers these species all distinct or all to be included in 

 A. colonorum. I find it almost impossible to determine the impression 

 he wishes to convey ; for in his paper of 1907, on the reptiles and amphi- 

 bians that he himself collected in the Egyptian Sudan and northern 

 Uganda (Sitz. Ak. d. Wissens. Wien, 116, i, 1907, p. 1837) he says: " Ich 

 kann dennach der A. doriae keinerlei spezifische Selbstandigkeit zus- 

 prechen und muss sie mit A. colonorum vereinigen." On the previous 

 page, however, speaking of the type of A. hartmanni, which lie examined 

 in Berlin, he says : " Das Exemplar hat entschieden nicht den Habitus der 

 Agamen aus der Rpinosa-colonorum Gruppe, sondern mehr den der 

 deserticolen Gruppe I bei Boulenger." But a few lines further on he 

 says again: "1st alter A. hartmanni mit A. doriae identisch, so ist 

 dasselbe zicherlich auch mit A. doriae und colonorum der Fall, und zwar 

 sprechen dafur sowohl morphologische als geographischer Grande," 

 while on the following page he names all three separately in his faunistic 

 lists of species. The material which I have at hand is not sufficient to 

 settle this question, which I imagine is still an open one. 



Latastia longicaudata (Reuss). 



A single specimen, almost adult, found at Singa, the present capital of 

 the Province of Sennaar. This specimen is much more brilliantly colored 



