97 



from which ti can at once be distinguished by the abdominal hands. It is stated 

 to have been found in Germany (Meigen, Grunberg 1909 p. 88), Schneider (1914 

 p. 42); Scandinavia (Zetterstedt 1850 p. 3459), Denmark (Staeger 1838 p. 553), 

 Holland Van der Wulp), Austria (Schiner), Russia (Gimmerthal), England (Ste- 

 phens, Verreil; Edwards 1912 p. 220; Lang 1920 p. 97). 



Eckstein, too, (1919 p. 66) has recently tried to elucidate the question but in 

 my opinion without success. He maintains that the species "in den Waldern um 

 Strassburg nicht sehr haufig ist", and says that the species is characterized by 

 its "glanzed silberweissen Schuppenringen an alien Knien, wodurch C. ornatus leicht 

 und mit Sicherkeit, namentlich frische Exemplare von ahnlichen Arten (C. lateralis 

 = F. geniculata), nemorosa and nigrina unterschieden werden kann". He maintains 

 that the authors after Meigen have determined the true ornatus as lateralis "sonst 

 wiirde man nicht von scharfen, weissen Knieflecken lesen konnen". As Meigen 

 (1818 p. 5) however writes with regard to lateralis: "Knie blass" it is in my opi- 

 nion questionable whether he is really right. 



As far as I can see Eckstein has described as 0. ornatus what is really Fin- 

 laya geniculata (= C. lateralis Meig.); as his description, more especially of the 

 female, is however rather insufficient, this cannot be established from his descrip- 

 tion of the imagines alone; on the other hand, if this description is combined with 

 that of the larva and the statements relating to the habitat, as far as I can see, 

 there can be no doubt upon that point. 



Eckstein (1918 p. 66) says that the larva lives "in den manchmal recht klei- 

 nen Wasseransamlungen in hohlen Baumer zusammen mit solchen von A. nigripes. 

 Die Eier werden einzeln wenige Zentim. oberhalb des Wasserspiegels an dem feuch- 

 ten Mulm u. s. w. ahgelegt". Galli Valerio and Rochaz de Jongh (1912 p. 224) 

 as well as Martini (1915 p. 585) have also found the C. ornatus-larxa in tree- 

 holes. This is just the place where I have found my F. geniculata (= C. lateralis) 

 larva. As North of the Alps we have hitherto never found other Culicin-larva in tree- 

 holes than this one ', I suppose that Eckstein and I have really found the same 

 larva. We have only determined the species in different ways, he as 0. ornatus. I 

 as Finlaya geniculata O. (= C. lateralis Mg.). That this is really the case, will be 

 clear if we compare the description of the larva of O. ornatus by Eckstein (1919 i 

 p. 291) with my description of F. geniculata. He describes this larva as follows. 

 "Die Larve fallt sofort durch die auffallend starke Beborstung des Korpes, insbeson- 

 dere des Abdomens auf. Jedes Abdominalsegment tragt namlich mehrere aus 6 — 9 

 meist aus 7 starren Borsten bestehende Borstenbiischel. Das Atemrohr is kurz ge- 

 drungen, nicht ganz 2 mal so lang als sein Durchmesser an der Basis, ziemlich 

 dunkel gefarbt. Der Dornkamm unterscheidet sich von den anderen Stechmucken- 

 larven ohne weiteres dadurch, dass die Dornen nicht wie bei jenen von der Basis 

 zur Spitze des Atemrohres allmahlig an Grosse zunehmen, sondern dass neben den 



1 Apart from the remarkable discovery of the larva of Onthopodomyia albionensis Mac Gregor 

 and Stegomyia fasciata (Fabricius) from the same tree-hole in Epping Forest. 



I) K. D. Vidensk.Selsk.Skr., naturvidensk. og nialhem. AW. 8. H;ekkt. VII. I. 13 



