24 AV. WESCHE — THE LARVAL AND 



3. Myzorhynchiis maiiritianiis, Tlieo. 



Larva. 



Two stages are present, but as they are similar in all important characters, 

 I shall not describe them separately. 



The whole larva is stout and very dark in colour ; the head is very chiti- 

 nous, almost opaque, and much smaller than the thorax. The antennae have 

 a plume in the middle o£ simple dark hairs ; there are two strong spines at 

 the end, and between them a branched hair (PL YI, fig. 17). Above the 

 brushes are tw^o characteristic fan tufts of short black hairs which are less 

 •develoned in the immature form (PI. YI, figs. 14 & 15) ; the usual plumes of 

 the face are of strong dark hairs and are also less developed in the imma- 

 ture form ; the eyes are very small and the pigment spot behind them is 

 darker. 



Thorax rather small, the simple hairs have only a short spine at their base ; 

 the anterior dorsal plumes are very short, but some well-developed longer 

 ones are found on the ventral side, and on either side of the median line are 

 two branched hairs and 5-8 simple hairs. 



On the abdomen, besides the usual plumes and accessory hairs, are large 

 beautiful palmate hairs, of rather dark pigmentation, which differ in the shape 

 ■of their scales from those of the tw^o previous species, while the points are 

 hyaline. They are found on both forms, being large on segments 3-7, and 

 rudimentary on the first and second segments (PI. YI, fig. 16). The 

 •comb consists of very long spines with shorter ones at the base (PL YI, 

 %.19). 



The anal segment is serrated and ciliated on its lateral edges, and has the 

 papillge subequal and a little longer than the segment. The beard is strong 

 but much denuded in the mature larvae. 



Mature larvae nearly 6 mm. long ; less mature form thinner, and w^ith less 

 ^developed thorax, but nearly as long. 



Pupa. 



The mouth of the trumpets is even larger than in the preceding- 

 species, and the outer buttress of the anal plates is less developed (PL VJ, 

 fig. 20). 



.Described from five larvse and one pupa. 



[Larva3 and pupae found in the large w^ater-holes behind the Institute and 

 in road puddles in July and August. In young larvae the abdomen is black 

 with 4 to 6 pale bands ; full grown larva? have a black abdomen w^itli usually 

 two brown bands. — W. M. G.] 



