BY R. J. TILLYARD. 717 



eyes fairly prominent, postocular lobes rounded; antennae 1-5 mm.^ 

 seven-jointed. Labium (Fig. 3): mentum short and broad, 

 (2-5 X 3-7 mm., when flattened out), median lobe forming a pro- 

 minent obtuse angle, with a few isolated hairs; lateral lobes sub- 

 triangular, inner margin and angle slightly rounded, carrpng 

 seven very distinct rounded crenations, each separated from the 

 next by an incision about as deep as the width of the crenation; 

 each crenation carries two sharp spines, of which the upper is 

 shorter than the lower; these crenations are themselves very slightly 

 crenulate, mostly on their upper margins. After the seventh 

 (lowest) crenation, the margin curves round in a single broad 

 curve carrying, firstly, a set of two spines, then a set of five spines 

 close together, of which the first is very small, and, finally, three 

 single spines on the part opposite the median lobe. End-hook 

 rather weak, very sharp and narrow, 0*8 mm. Setae : mental 5, 

 lateral 5, all rather weak. Surface of lateral lobes considerably 

 marked with small black spots. Thorax: prothorax short and 

 wide, 0-8 X 2-5 mm., with distinct, but not very sharp, antero- 

 lateral prominences. 3Ieso- and metathorax fairly short and smooth, 

 wing-cases about 4 mm. long, lying parallel along the back, and 

 reaching about up to end of segment 5 of abdomen. Legs of 

 medium length, slender ; measurements of femur, tibia and tarsus : 

 fore, 3, 3-4, 1-5; middle, 3-6, 3-8, 1-5; hind, 4-8, 4-5, 1-8 mm. 

 Abdomen: oval, 8x4 mm , moderately convex beneath, very 

 rounded above, and rising to the dorsal ridge, so that the cross- 

 section appears broadly triquetral. Lateral spines only on 8-9, 

 very small; dorsal spines on 5-10, nodding; those on 5-6 large, 

 that of 7 flatter and smaller, that of 8 still smaller, while those of 

 9-10 are close together, very small and depressed. Segment 10 not 

 enfolded by 9, except in so far as the dorsal and lateral spines 

 of 9 project beyond its level (Fig. 2). Appendages 0-5 mm., 

 broadly triquetral, with slightly concave sides, tips bluntly 

 pointed; involucres of 9 imaginal appendages very short, lying 

 close in between the larval appendages, the whole forming a trun- 

 cated triangular pyramid. 



