138 



Anj^als of the Tkansvaal Museum. 



two longituclinai grooves in anterior lialf^ parallel and extending from 

 margin of -lueld where cervical grooves emerge ; lateral of each of these^ 

 another groove curved inward_, and broken in the middle ; on 

 l^osterior j.alf three grooves, one median and extending anteriorly between 

 the base of the anterior median grooves, tM^o 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 orihce 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 Ijelow coxae lA". 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. Bostruiii a little longer than 

 that of the male, base as long as wide, extending anteriorlv over the 

 mandibles, making it appear almost triangular : sides rounded ; porose areas 

 large, oval ; digit of maudibles witli outer apophysis bearing three teeth, 

 anterior tootli very tiny, otlier two very large, posterior largest (X/I, d) ; 

 inner a])0])hysis tridentate ; hypostome elongate, resembling that of male. 

 Legs and coxae as in tlie male, exce])t that the si)ine of coxae IV is almost 

 obsolete ; tarsi as in male. 



Nympli. — Uneiig'orged nynipli 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 marke;l. 

 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 reddisli 

 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 thirrl. Bostrum (XII, e) light dirty yellow, base triangular on 

 dorsal surface, ])entagonal 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 lY with a single blunt tooth. 



Larva (unengorged).— jBo^Z?/ 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 l)ody, 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 ])airs of spines on intercoxal area ; one 

 pair opposite postero-median extremity of each pair of coxae ; one pair 

 of stio-matic openings between coxae I and II, another between II and 



