Notes on Doubtful Species 293 



superficial, almost forming the lateral border. Venter glabrous, or almost so ; 

 sexual grooves straight, divergent, attaining the posterior border ; anal grooves 

 parallel, united in an arc in front. Spiracle large, circular. Capitulum 

 0-35 mm. I., base rectangular, broader than long ; hypostome elongate, lanceo- 

 late, 2 1 2, 10-11 teeth per file, the external pointed, the internal blunt. Palps 

 of medium length, article 3 equal to 2. Legs of medium length, dark brown ; 

 coxae almost contiguous, glossy, with some very short hairs ; a tuberosity at 

 each of the two posterior angles, more pronounced on coxa I, almost obsolete on 

 coxa IV. Tarsi elongate, slightly tapering at their tips ; pad almost as long as 

 claws. 



Larva : similar to o, but shorter (1'2 mm.), hexapod. 



Host : Holotropis (Iguana) from New Grenada (Paris Mus.). 



Ixodes trianguliceps Birula, 1895, pp. 358, 359, PI. I, Figs. 14, 15 ( $ capitulum, coxa). 

 This species apj>ears to be closely related to, if not identical with, /. tenuirostris 

 Neumann. Birula's figures are obviously drawn from a mounted specimen and 

 consequently it is impossible to reach any conclusions as to its identity. We 

 wrote to Professor Birula (St Petersburg) for the loan of the (unique) type, but 

 he feared it might be lost in transit. Should Birula's specimen prove to be 

 identical with Neumann's type, then trianguliceps would have priority. Birula's 

 description of the scutum of trianguliceps as being as broad as long may be due 

 to distortion in the mounted specimen. 



