109 



After man}' excursions in 1915 — 16 always without result, finally, in 1917, I 

 had the good fortune to catch the imago. On an early day in July I was sitting 

 some 100 yards from the pond where I first got the larva. After a heavy rain the 

 mosquitoes stung vigorously. 0. communis and cantans swarmed around me; then 

 there arrived three specimens of a dark-coloured mosquito which immediately at- 

 tracted my attention. I could not get more than the three specimens; hut when 

 these were more thoroughly examined later on, it was established that I had found 

 the Tceniorhynchus for which I had waited patiently for three long years. The next 

 dav I had to leave for my new laboratory at Tjustrup, and when I returned, I 

 found no more specimens. Still the animal could now be identified and the observa- 

 tions be published. 



According to Giles (1900), Blanchard (1905) and Howard, Dyar and Knar 

 (1912 — 17), the home of the genus Tceniorhynchus is almost entirely restricted to 

 the tropical or subtropical countries. The main localities are Brazil, West-Africa, 

 the neighbourhood of the great African lakes, India, China and West- Australia. Ac- 

 cording to Howard, Dyar and Knar North America possesses only two species 

 T. ochropus Dyar and Knab and T. perturbans (Walker) Dyar. In about 1900 Euro- 

 pean dipterologists show that the genus also occurs in Europe, and that a single 

 species lives far beyond the normal area of distribution. In 1896 Ficalri describes 

 a mosquito from Italy under the name of Culex Richardii. Theorald (1901 p. 194) 

 refers the species to the genus Tceniorhynchus and remarks: "Ficalri's T. Richardii 

 comes in this genus in spite of the male ungues differing from those of Arriralzaga's 

 species" (1901 p. 190). According to Theobald (1901 p. 197) a single specimen of 

 this species was found in England near Sutton by Bradley and, probably, the species 

 also occurs at Toronto (Canada); finally in 1903 (p. 269) Theobald states that the 

 species "seems to be common in some parts of the Norfolk Broads, England." 



Later on Edwards (1912 p. 261) has recorded the species from different parts of 

 England, and Lang (1920 p. 99) mentions many other localities. Also Eckstein (1920 

 p. 232) has found the species "in den Waldern bei Brumath (Unterelsass)"; Martini 

 (1915 p. 605) at Danzig and Hamburg; most probably the species is more common than 

 hitherto supposed. Just before this paper was going into print Prof. G. W. Mit.ler, 

 Greifswalde, wrote to me that he had found a peculiar pupa in that place the 

 previous summer and sent me two drawings of the trumpets. The drawings prove 

 that he has undoubtedly found a Tceniorhynchus-pupa and that he has interpreted 

 the structure of the trumpets in the same way as I have. In 1919, simultaneously 

 with my own paper relating to the Ta'niorlujnehus larva Edwards published a valu- 

 able paper on the same subject (1919 p. .S3). In all main points we agree well. 

 Edwards has seen the larvae "when disturbed rise to the surface of the water and 

 hang suspended there in the manner of an ordinary mosquito larva." I do not 

 think that they ever do so in nature, but in 1919 and 1920 I have often seen the 

 larva in my aquaria in this position when the roots were bad. As far as I can see 



