138 
Annals of the Transvaal Museum. 
two longitudinal grooves in anterior half, parallel and extending from 
margin of shield where cervical grooves emerge ; lateral of each of these, 
another groove curved inward, and broken in the middle ; on 
posterior naif three grooves, one median and extending anteriorly between 
the base of the anterior median grooves, two lateral grooves curved sharply 
-outward below the middle of the length ; between each of these and the 
median groove, near lateral margin, a very short groove, also a short groove 
on each side of median groove near posterior margin. Ventral surface 
same colour as dorsal ; sexual orifice opposite first intercoxal space; anus 
near posterior third, ano-marginal groove present ; two short grooves 
lateral of it, one on each side ; genital grooves turning sharply outward, 
and posteriorly below - coxae IV. In unengorged females caudal festoons 
are well marked on both surfaces ; stigmatic plates triangular, wide, 
with a sharp short point extending laterally, but not as long as in male, 
white, with orifice and margin dark brown. Rostrum a little longer than 
that of the male, base as long as wide, f extending anteriorly over the 
mandibles, making it appear almost triangular ; sides rounded ; porose areas 
large, oval ; digit of mandibles with outer apophysis bearing three teeth, 
anterior tooth very tiny, other two very large, posterior largest (XII, d) ; 
inner apophysis tridentate ; hvpostome elongate, resembling that of male. 
Legs and coxae as in the male, except that the spine of coxae IT is almost 
obsolete ; tarsi as in male. 
Nymph. — Unengorged nymph 2 mm. long by 1.5 mm. wide,, broadly 
oval in outline, wider behind > resembling male in general contour, colour 
deep chestnut brown, lighter on the edge ; posterior festoons well marked. 
Shield (XII, e) cordiform ; postero-lateral edges emarginate near centre ; 
eyes shining, dark coloured, large and slightly orbited ; cervical emargina- 
tion very shallow ; cervical grooves deep, converging at first, then sharply 
diverging to middle of postero-lateral margin ; surface of shield covered 
with small reticulations evenly distributed over its whole extent ; colour 
deep chestnut brown ; median area lighter, and of a metallic reddish 
colour in posterior half, shading to almost yellow at cervical emargina- 
tion ; reddish at angles of emargination. Ventral surface same colour 
as dorsal; stigmatic plates large and circular, opening eccentric ; anus 
at posterior third. Rostrum (XII, e) light dirty yellow, base triangular on 
dorsal surface, pentagonal on ventral surface ; palpi as in adult, only article 
III is longer than wide ; hypostome with only two rows of teeth on each 
half ; digit of mandibles as in female. Legs small and slender, light 
yellowish in colour ; coxae small, rectangular in outline ; coxae I biden- 
tafe ; coxae IT with a single blunt tooth. 
Larva (unengorged). — Body a very short oval, widest behind coxae 
III, nearly circular with five to seven festoons plainly marked ; length 
0.75 mm., width 0.60 mm. ; colour light reddish brown. Shield (XII, g) 
Covering front half of body, heart shaped, resembling that of female, 
postero-lateral margins nearly straight, longer than antero-lateral ; posterior 
angle well rounded, cervical emargination shallow and wide with a 
reddish metallic lustre, cervical grooves well marked, nearly 
straight, and reach to' the posterior margins ; eyes large and dark coloured, 
flat at lateral angles of shield. Ventral surface (XII, f) same 
colour as dorsal surface ; a large spine anterior of each emargination of 
the ten caudal festoons ; three pairs of spines on intercoxal area ; one 
pair opposite postero-median extremity of each pair of coxae ; one pair 
of stigmatic openings between coxae I and II, another between II and 
