H. Scott 
601 
flattened and S 9 ale-like. Anterior coxae not elongated. Middle coxae 
each with a small blackish area at the outer distal angle (see Fig. 5). 
Femora of average form, only moderately robust. Tibiae rather 
slender, not ringed, with about 6 obliquely transverse series of bristles 
on the distal half of the lower surface, in the proximal series fine and 
short, in each successive series towards the apex becoming longer and 
more robust, in the apical series long, stout, and curved (there is not 
a marked predominance of three or four bushy series of long, stout 
bristles, as in some Penicillidiqe). Metatarsi of all the legs, as stated 
above, long and slender. Abdomen described below, under the species. 
Larva and pupa, see below, in the specific description. 
Type of the genus: Eremoctenia progressa (Muir). 
Affinities. All other described genera of Nycteribiidae have both 
thoracic and abdominal ctenidia, with the exception of ArcJiinycteribia 
Speiser (1901), which has no abdominal ctenidium. Archinycteribia 
has however no other special points of resemblance to Eremoctenia, for 
it possesses thoracic ctenidia and single-faceted eyes, and has all its 
metatarsi very short. Its single species, A. actena Speiser, also differs 
widely in specific characters from Eremoctenia progressa. In having 
no eyes and in the form of the legs the genus resembles the subgenus 
Acrocholidi'a of Nycteribia, but I doubt if there is really any close affinity 
between them. On the whole I should be inclined to place Eremo¬ 
ctenia nearer to Penicillidia, in spite of the absence of eyes and ctenidia. 
In specific characters certain forms of Penicillidia are not altogether 
unlike Eremoctenia progressa: e.g. Kolenati’s figures (1863, Pis. X, XI) 
of Penicillidia conspicua Speiser (= westwoodi Kol. nec Guer.-Men.) 
show certain resemblances to E. progressa in the abdomen of both sexes. 
But in the present state of our knowledge Eremoctenia must stand 
fairly wide apart from any known form, its diagnostic characters being, 
as will be seen above, largely negative, that is, consisting in the absence 
of structures which other genera possess. 
Eremoctenia progressa (Muir). 
Penicillidia progressa Speiser, MS.; Muir, Bull. Mus. Zool. Harvard, 
Liv, no. 11, 1912, pp. 351-2, 356-8; PI. II, figs. 8, 10 (larva, 
pupa, etc., but no description of the adult). 
Length of body, not including head or legs, about 2-25 mm. 
Head : the remarkable shape of the capsule has been mentioned; 
front part of vertex rather densely clothed with stoutish bristles, which 
