61 



first median single hairs two or three smaller ones. Lateral hairs of the first seg- 

 ment triple, on the second to sixth double. Eighth segment with tufts in common 

 arrangement. Lateral comb of about forty scales, arranged in rows, covering a tri- 

 angular area; the scales are spatulated at base, ending in a strong spine and fur- 

 nished with rather long spines at the borders of the spatulatea part. Sipho stout, 

 a little less than four times as long as wide, slightly tapering at apex ; pecten rather 

 fine, consisting of about twenty thorns, reaching nearly to tne middle of the tube, 

 the last two teeth but slightly detached without dentitions, the others with from 

 three to four teeth followed by a large tuft, consisting of six or seven hairs. Anal 

 segment longer than broad, covered by a large dorsal plate, dorsal hair-tuft con- 

 sisting of a coarse tuft and two very strong and long hairs ; ventral brush large, in 

 the barred area consisting of about 11 rays, each ray carrying about six or seven 

 hairs; before barred area six free hair-tufts; the lateral hair-tuft consisting of one 

 single strong hair; four gills, equal, acute. 



Lateral tufts of labrum rather short; the inner part modified in comb-hairs, 

 arranged like a crown round the palatum; this is covered with short, soft hairs. 

 Mandibles quadrangular with two spines before collar; a row of rather short cilia 

 from collar and about tw r elve spines in row r from inner margin; dentition four strong 

 spines, the first strongest; before them two dagger-like thorns, the one dentated. 

 Process below distinctly divided with hairs on both apices; a group of hairs at 

 base. - - Maxillae indistinctly divided by a suture; at the apex a rather long tuft of 

 hairs, and at its base one or two spines. The whole space between suture and inner 

 border covered with long soft hairs and long bristles along the inner border; between 

 suture and palpe an area covered w r ith soft hairs. Palpe well developed, short w r ith 

 four or five digits. Mentum triangular, an acute median tooth and ten lateral thorns. 



Colour bright yellow, rarely gray; the strongest chitinized parts of the body 

 yellowish -red; body highy transparent. 



Systematical remarks. The description of the female and male is mainly taken from 

 H. D. K. (1917 p. 675) (A. fletcheri) with which my specimens have been carefully 

 compared; they have been determined by Dr. Edwards. Most probably the species 

 is identical with Culex flavescens Theobald (1901 p. 410). With regard to the ima- 

 gines there is full accordance bet\veen the American specimens and the Danish 

 ones, w r ith regard to the larvae there are rather significant differences. I have never 

 seen any fine hairs on dorsal surface towards base of the sipho as indicated by 

 these authors for the American specimens; the number of scales are greater in my 

 specimen (30 40 against about 25) ; further the last two thorns are but slightly detached 

 from the others; and the frontal hairs are not triple in both tufts as indicated by the 

 American authors, but double in the upper, and with five hairs in the lower, frontal tuft. 



As however the imagines also with regard to the male genitalia are indistin- 

 guishable from the American specimens, I suppose that it is temporarily most cor- 

 rect to refer the Danish specimens to the American species. 



Biology. I have mainly found the species in four localities resembling each 



