105 



segment without these hairs. Lateral comb of eighth segment with ten to twelve 

 scales in a single, irregular row; each scale having a somewhat spatulated base and 

 terminated by a stout spine, at the base of the latter on both sides a commonly 

 smaller spine, followed by a series of still smaller weaker ones; hair-tuft behind 

 the comb consisting of from three to four, long hairs. Air-tube about twice as long 

 as wide; the basal part broad and strongly convex with black ring near base, the 

 apical portion attenuated, consisting of thick lamellae with a group of hooks at the 

 tip and with stout teeth on one side mesially. It bears a hair-tuft on each side 

 near the middle, and two pairs of filaments at base of apical projection; the one 

 pair strongly curved, inserted upon two cushion-like parts of chitin and very mov- 

 able. No pecten; two strong hairs at the base of the sipho. With regard to the more 

 thorough description I refer to my paper (W-L, 1918 p. 277). Anal segment much 

 longer than wide, ringed by a chitinous plate; dorsal tuft of many long hairs, divid- 

 ed into two small and two large groups on each side, no particularly developed 

 long bristles; ventral brush great, consisting of about eight to ten rays, each car- 

 rying from eight to ten, very flexible bristles; either no tufts or a few (two) very 

 feebly developed tufts before the ventral brush. Anal gills four, equal, slender and 

 not as long as anal segment. 



Mouth brushes very large,, distinctly divided into two parts: the inner part 

 without comb-bristles; palatum coated with a covering of rather short hairs. Man- 

 dibles remarkably high, three, long, curved thorn-like spines near the collar, a row 

 a cilia from a collar and from inner margin a series of tubercles bearing rather 

 long, curved but feeble seta;; dentition about four to live irregular dark highly 

 chitinized thorns, one of them very long, acute and dagger-like; process below di- 

 stinctly furcate, with hair-tufts on both furca. The maxillae very large; the apex 

 bears an elegant large brush of dense and long hairs and near the outer margin a 

 very strong spine. Surface between the longitudinal suture and the inner margin 

 covered with a coaling of dense but short hairs; no particular fringe of long hairs 

 along the inner margin; the palpus short. Mentum provided with a very large 

 median tooth and very few (about six) but great lateral teeth. Colour of the larva 

 milky-white; head and thorax of almost the same colour as the abdomen; sipho 

 in the broad part yellowish, in the attenuated part almost black; most of the hairs 

 of a golden colour. 



Pupa: Thoracic mass subpyriform, rather large, indented behind the insertion 

 of antenna?. Abdomen serrate, the segments largely expanded posteriorly; anal paddles 

 oblong, cleaved at apex; the whole pupa quite hairless. No hairs on the ce- 

 phalothorax; no fan-shaped dorsal tufts on first segment; no subdorsal hairs at the 

 ends of the abdominal segment and no tufts on the angles. The most peculiar point 

 in the structure of the pupa is the two airtubes; these are not as in other mos- 

 quito pupae trumpet-shaped, but end in a long, sharp, thorn-like process of a very 

 peculiar shape and structure. The tracheae runs through the whole tube, ending at 

 the apex in a minute, almost invisible aperture. The tube itself has in the different 



U. K, 1) Vidensk. Selsk. Skr . naturvldensk. ug muthem. Afd. 8 Rrekke. VII, I. 1 4 



