Mdittomma insulare, and DasdUiis ecrvinus. 281 



figures of the larva, appeared in "Tidsskrift for Landbrugets 

 Planteavl," Vol. Ill, pp. 15.5^100 (1896), and the second, 

 with description and figure of the pupa, in the same 

 Journal, Vol. X, pp. 147-151 (1903). 



The drawings prepared for me by Mr, Horace Knight 

 were already well advanced when I received Dr. Boas' 

 papers. They will serve to supplement in some of the 

 details, the figures and descriptious published by Dr. Boas, 

 and a very brief description of the larva is all that need be 

 given here. 



The larva is of a testaceous colour, marked with transverse bands 

 of a somewhat paler tint especially on the ventral side of the 

 abdomen. The coxjb also are of a paler colour ; it is furnished with 

 a number of rather strong stitf hairs arranged somewliat in trans- 

 verse rows. Head relatively very large, the clypeus prolonged 

 anteriorly in the form of a broad flat plate (epistome) which overlaps 

 the base of the mandibles and ends in front in a short downwardly 

 curved piece that seems to represent the labrum ; this is only marked 

 off from the epistome by a slight incision or impression on each side, 

 Antennee. 4-jointed, the 4th joint very short and inconspicuous. 

 Mandibles robust, pointed at apex, each with two cutting teeth on 

 the inner side and a slender moveably articulated tooth (prostheca), 

 between which and the large basal molar tooth there is a broad 

 depressed space lined with a very pale coloured integument. Max- 

 illie with 3-jointed palpi, and two narrow lobes, the inner lobe bifid 

 at the apex. Labial palpi 2-jointed, arising each from a rather 

 distinct palpiger ; ligula emarginate in front. Abdomen made up 

 of ten segments, of which nine only are visible from above ; the 

 tenth very short, its sternite has an incision in the middle, and its 

 tergite is only just visible beneath the tergite of the 9th, the latter 

 has a short process projecting backwards at each side. Spiracles — 

 nine pairs ; the first pair situated, as shown in Fig. 3«, on the ventra 

 side of the prothorax, the others, very much smaller in size, placed 

 close to the antero lateral angles on the tergites of the first eight 

 abdominal segments. In structure the spiracles are very interest- 

 ing ; for as Dr. Boas has already pointed out, though with some 

 expression of uncertainty, they resemble those met with in certain 

 Lamellicorn larvae. Each has a somewhat crescent-shaped sieve- 

 plate, the concave side of which, into which fits the bulla, is directed 

 towards the head. Whether there is present or not a narrow slit-like 

 aperture between the bulla and the sieve-plate, is a point still to be 

 determined, This can o«ly be ascertained with certainty by making 



