RHYNCHOLABA. 461 



third and one-half, mid-leg more than one-half distance to 

 tip of wing-case ; a small shortly triangular coxal piece. 

 Surface of head, thorax and sides of tongue-sheath rugose ; 

 tongue-sheath with a very deep palpal cavity ; wing-case 

 very rugose with flattened tubercles, the veins very prominent, 

 costa raised into a coarse zigzag ridge : tongue flatly 

 depressed between the zigzag edges of costa from its tip 

 to tip of mid-leg, then rising gradually into a rounded ridge 

 which becomes the edge of the projecting tongue-case ; tongue- 

 case with a mesial channel ; abdomen shallowly, transversely 

 corrugate. Spiracle of 2 a narrow slit lying behind the slightly 

 curved hind margin of 2, and covered by a transversely 

 oblong lobe projecting from the front margin of 3, the surface 

 of the lobe rising slightly from behind forwards ; remaining 

 spiracles elongate -oval, central slit with a raised rim, each 

 spiracle lying on a larger oval with a smooth shining surface. 

 Cremaster equilaterally triangular, dorsal surface slightly 

 convex, basal third tumid, tip squarely truncate, a polished 

 cylindrical shaft at each lateral angle of the truncation, these 

 shafts diverging slightly and each dividing into two arms, 

 shorter than the common shaft ; these arms sometimes 

 dividing again into two short hooks ; segment 14 with a deep 

 funnel-shaped depression under base of cremaster, running 

 forward axially. Colour pale chestnut, tongue-sheath and 

 wing-case fuscous, costal zigzag ridges pale brown ; abdomen 

 with segments 9 to 14 darker than anterior segments ; an area 

 round each spiracle, and venter, speckled with blackish and 

 whitish ; spiracles of the body-colour, the lobe of segment 3 

 black ; cremaster with main shafts shining black, bifurcations 

 transparent reddish or whitish. Length 46 mm. ; breadth 

 10 mm. 



Habits. — Food-plants : Impatiens Linn., family Geraniaceae ; 

 Knoxia mollis W. & Arn., family Rubiaceae, and arums, family 

 Aroideae. The horn of the larva is movable in. a vertical plane 

 in all but the last instar, and the anterior segments are strongly 

 retractile. The pupa is very stiff. We have not seen the 

 moth in its natural state. 



Genus RHYNCHOLABA Rothschild & Jordan. (Fig. 119). 

 Roths. & Jord., 1903, p. 789. 



Genotype : acteus (Cram.). 



Imago. — <££. "Second segment of palpus triangular; the 

 joint widely open, some dispersed long scales on the naked 

 space of the opening ; scaling of first segment longest just 

 below the opening, the palpus thus differing in outline from 

 that of every other sphingid. Mid- and hind tibia short- 

 scaled ; basal spines of mid-tarsal comb prolonged, longer 



