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SOME OBSERVATIONS ON THE BIOLOGY 
AND STRUCTURE OF ORNITHODORUS 
MOUBATA, MURRAY. 
By N. CUNLIFFE, M.A. (Cantab.). 
Welch Lecturer in Economic Zoology, University of Oxford, and formerly 
Student in Medical Entomology, Quick Laboratory, Cambridge. 
TOGETHER WITH 
A NOTE ON THE EXTERNAL CHARACTERS WHICH 
SERVE TO DIFFERENTIATE THE SEXES. 
By G. H. F. NUTTALL, F.R.S. 
(With PL XVI and 5 Text-figures.) 
CONTENTS. 
Introduction. 
Section I. Biology of 0. moubata . 
Experimental procedure. 
Experimental records relating to females kept at different temperatures 
Feeding . 
Copulation. 
No evidence of parthenogenesis. 
Oviposition. 
Longevity of females, males and nymphs. 
Duration and number of nymphal stages, at 22° and 30° C.: 
(а) Experimental data. 
(б) Discussion of data. 
Duration and extent of engorgement at each stage .... 
Influence of moisture on vitality and ecdysis. 
Section II. Structure of 0. moubata . 
Dimensions of egg. 
Dimensions of unfed stages. 
Changes in external anatomy undergone during development (a) hypo 
stome, (6) legs, (c) spiracle. 
External characters which serve to differentiate the sexes (by G. H. F. N.) 
INTRODUCTION. 
At the suggestion of Prof. Nuttall, F.R.S. the following observations were 
made in the years 1913-14, in continuance of an investigation unavoidably 
left unfinished by a former student, the late Mr Gordon Merriman 1 . The 
original proposal was to supplement what has already been published, ie 
garding the biology and structure of 0. moubata [vide Nuttall and Warburton 
(1908), Nuttall (1911 a and b) and Nuttall and Merriman (1911)] and the ob¬ 
servations are presented under these headings in Sections 1 and II respectiv el\. 
The records are incomplete in many ways, because nearly all the living 
1 Some of Merriman’s data have been utilised and are fully acknowledged in the text. 
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