Annals of the Transvaal Museum 
75 
blackish spot on costa at ^ and sometimes one in middle; stigmata blackish, 
, plical obliquely before first discal; an obscure lighter angulated transverse 
! shade at f, extremities preceded by some blackish irroration; a suffused 
blackish spot in disc beyond this, and cloudy dots round apical part of costa 
and termen: cilia whitish-grey, basal half sprinkled with black. Hind wings 
I light grey, paler and bluish-tinged in disc; cilia pale grey. 
Transvaal, Pretoria, in December (Swierstra) ; three specimens. 
Thiotricha pahobola n.sp. 
^'qmm. Head and thorax shining white. Palpi grey, apex white. Abdomen 
grey-whitish. Forewings elongate, narrow, costa hardly arched, apex round- 
! pointed, termen slightly sinuate beneath apex, extremely oblique; shining 
white; costal edge dark fuscous towards base; a very oblique elongate dark 
fuscous mark towards dorsum before middle; a dark fuscous line running 
from disc beyond middle to apical patch, where it meets a similar shorter line 
from an irregular suffused spot on tornus ; a patch along apical fourth of costa 
consisting of three oblique wedge-shaped dark brown spots separated by white 
strigulae, second strigula limiting a blackish apical dot, and preceded by two 
minute linear black dots surrounded by pale ochreous before termen: cilia 
white, round apex with dark fuscous subbasal line and grey apical shade. 
Hindwings grey; cilia pale grey. 
Transvaal, Pretoria, in January and March (Swierstra) ; two specimens. 
Allied to tenuis, but quite distinct. 
Plectrocosma n.g. 
Head smooth-scaled; ocelli posterior; tongue developed. Antennae f , in 
^ moderately ciliated, basal joint moderately elongate, without pecten. 
Labial palpi long, recurved, second joint with appressed scales, terminal joint 
longer than second, moderate, acute. Maxillary palpi very short, filiform, 
appressed to tongue. Posterior tibiae clothed with long hairs above. Fore- 
wings with 2 from towards angle, 7 absent, 8-10 approximated, ii from 
middle. Hindwings under i, elongate-trapezoidal, apex acute, produced, 
termen sinuate, cilia 2|; 3 and 4 connate, 5 parallel, 6 and 7 stalked. 
Plectrocosma centrophora n.sp. 
(J 10 mm. Head and thorax shining white, sides of face dark grey. Palpi 
white, second joint blackish-grey except apex. Antennal ciliations i. (Abdo- 
men missing.) Forewings elongate, narrow, costa slightly arched, apex 
pointed, produced, termen sinuate beneath apex, very oblique ; shining white ; 
a narrow blackish streak along costa from base to middle; an irregular dark 
violet-grey-streak along termen, lower portion dilated and margined anteriorly 
by a leaden-metallic black-edged mark: cilia whitish-grey, beneath apex 
suffused with grey, at and beneath apex with two dark grey lines, on costa 
wholly white. Hindwings whitish-grey, more whitish towards base; cilia 
ochreous-whitish. 
Transvaal, Pretoria, in January (Swierstra); one specimen. 
Melitoxestis n.g. 
Head smooth; ocelli posterior; tongue developed. Antennae |, in ^ 
moderately ciliated, basal joint elongate, without pecten. Labial palpi very 
long, recurved, second joint rather thickened with appressed scales, terminal 
joint longer than second, acute. Maxillary palpi very short, filiform, appressed 
to tongue. Posterior tibiae clothed with hairs above. Forewings with 2 from 
