120 



basal cross-vein about its own length distant from the anterior cross-vein; fringe 

 brown with pale reflexions along the inner border towards the base. Halteres ochra- 

 ceous-brown with a slightly fuscuous knob, stem elongated and thin. 



Larva: Head subquadratic, almost twice as wide as long, a notch at in- 

 sertion of antennae; front margin almost straight, slightly arcuate. Antennae very 

 long, longer than head, elegantly curved, covered with spines, especially between 

 antennal tuft and head ; the part of the antenna between the head and tuft ivory 

 coloured, the narrower part brown; tuft very large, inserted near the apex, consis- 

 ting of more than twenty five very long feathered hairs ; the terminal portion slender, 

 carrying two long hairs before apex, on apex itself one long and one short hair; 

 between them a short digit. Anteantennal tuft almost in line with the frontal hairs 

 multiple; lower frontal tuft with four hairs, upper double; the points of insertion 

 of the hair-tufts forming a curved line over the epistome. Eyes large. 



Thorax subquadratic, angled at hair-tufts; hair formula of frontal border 

 231124421132. Lateral hairs in large multiple tufts some single, strong hairs. 



Abdominal segments rather narrow, lateral hairs on first two segments multiple, 

 single on third to seventh; subdorsal tufts double on third to seventh segment. Tufts 

 of eighth segment in common arrangement, but all remarkably feebly developed. Late- 

 ral comb consisting of a great many, about a hundred scales, arranged in rows 

 occupying a large triangular area; each scale with spatulated base and elegantly 

 feathered broad tip. Sipho straight, extremely long, (5 — 7 times longer than broad; a 

 tuft of five hairs at base; the pecten extremely short, consisting of only about six to 

 eigth thorns, all broad obliquely feathered, no tuft of hairs between pecten and apex. 

 Anal segment longer than wide; ringed by a dorsal plate; dorsal tuft in two parts, 

 the upper part consisting of a tuft of many, rather short hairs, the lower of 6 — 8 

 hairs, unequal, two very long. Ventral brush in the barred area consisting of 12 rays, 

 each carrying about twelve hairs; before the barred area about six detached hair- 

 tufts. No lateral tufts. Anal gills long, acute, equal. 



Lateral tufts of labrum very large, distinctly separated in two parts the inner 

 part without any comb-bristles, palatum large, covered with short, soft hairs. - 

 Mandibles quadrangular, with four strong spines before the collar; a row of long 

 cilia from a collar; about 10 scales from margin, but no distinct spines: dentition: 

 five teeth, two of them strong, before them a very long, arcuate thin thorn. Long 

 cilia below the teeth; process below distinctly furcate, with strong hair- tufts on both 

 tips; a group of hairs at base. Maxillae elliptical, tips conically rounded; at apex a 

 large brush of long, soft hairs. No spines at margin. Palpus well-developed with 

 five little apical digits. Mentum high triangular, the median tooth large, with 10 

 or 11 teeth on each side. 



Colour of the body brown or green, brushes on labrum golden. 



Systematical remarks: From the description above it will be understood 

 that there are same distinct differences between Theobald's species C. morsitans 

 and the Danish specimens. The greatest variations are to be found in the white 



