600 
Nycteribiidae 
of the anterior spiracles, and continuing along the sides to the front; 
no line of dehiscence runs towards the ventral surface. The position 
of the head of the pupa would prevent the use of a ptilinum, as the 
legs are folded over the head and thorax, the femorotibial joints meet¬ 
ing in the middle hne (see Muir’s figure 10, plate II). A movement of 
the legs would force off the operculum.”] 
The pupal stage of Cyclopodia greeffi was found to last from 12 to 
16 days. At emergence the imago is pale and feebly chitinised, but 
otherwise this phase is outwardly precisely similar to the fully matured 
form. The d and $ internal genital organs of the adult are described 
and figured. The two ovaries were always found in an unequal state 
of development, indicating that their functions do not correspond 
chronologically, though whether there is a regular alternation in the 
production of ova is not known. 
B. SYSTEMATIC SECTION. 
Genus EREMOCTENIA, gen. nov. (PI. XXIV, figs. 1-5). 
Diagnostic Characters. Thoracic ctenidium entirely absent in 
both sexes. Abdominal ctenidium also entirely absent in both sexes, 
its place taken by a few ordinary bristles. Eyes quite absent. Tibiae 
not ringed, not broad and flattened. Metatarsi long, approximately | 
the length of the tibiae. 
Description. The form on which this genus is founded has at flrst 
sight somewhat the aspect of a Penicillidia, from which genus it is how¬ 
ever clearly separated by the absence of ctenidia and eyes. The head- 
capsule is of characteristic shape, swollen and bulbous behind, narrowed 
in front. I am convinced of the absence of eyes in both sexes after a 
careful examination with the compound microscope; when these organs 
consist of single facets and have no dark pigment beneath them they 
are very easy to overlook, but in the present case diligent search has 
quite failed to reveal them. Thorax: Fig. 5 is specially drawn to 
demonstrate the complete absence of ctenidia, the front and middle legs 
being held aside to show the space where the ctenidia normally lie: 
the only visible structures which could possibly represent them consist 
of a small series of fine and minute bristles on the lateral margin im¬ 
mediately in front of the base of the middle coxa, but these hardly 
seem to be in the normal position for a ctenidium. Further particulars 
as to the thorax are included in the specific description below. Halteres 
