586 Dr. D. Keilln on the 



7. Dasyhelea halophila, Kieffer, 1911. 



Tins species represents the type of the genus Dasi/helea. 

 The larva? and pupie of this midge were for the first time 

 found and described by Rhode (1912, pp. 24-26, quoted by 

 Rieth, 1915). According to Rieth (1915) the larvse and 

 pupae of D. hahphila were found by Prof. Steuer-Insbruckin 

 a rock-pool at Manera Bay near Ragozuica (Sabenico), and 

 also in rock-pools at Scoglio Mulo. The larva is 5 to 

 6 mm. long ; the head is of a light brown colour and is about 

 twice as long as broad ; the post-abdominal iiooks are brown 

 and only slightly curved. The pupa is 4 to 5 mm. loug ; 

 the prothoracic horns are covered with triangular plates. 

 The forked post-abdominal protrusions are bifurcated (see 

 his text-figs. : 46, 48-50, 52, 53, 62, & 64). 



8. Dasyhelea coarctata, Kieffer, 1913-1914. 



According to Rieth (1915) the larva of this species was 

 found by Dr. Martin Hasper in a river at Monte San 

 Bernardo, near Lugano. The larva is 6 to 7 mm. long and 

 similar to that of hahphila. The pupa is 5 to 6 mm. long. 



9. Dasyhelea diplosis, Kieffer, 1913, 1914. 



According to Rieth (1915) the larvae and pupae of this 

 midge were found by A. Thienmann in Westfalia, in 

 incredibly high numbers between the filamentous Algae, 



The salt content of this water varied from 7*219 g. to 

 13*485 g. per 1., and at the end of May the pupae of this fly 

 were found in another pool with salt content 61*83 g. per 1. 

 The larva and pupa of D. diplosis have been described and 

 figured by Rieth (1915, figs. 45,47,51, 54, 61, 63, & 65, A). 

 The larva is 6 to 7 mm. long, white and opaque ; the post- 

 abdominal hooks are transparent, short, and markedly 

 curved. The head is long, only one and a half times the 

 width. The pupa is 5 to 6 mm. long ; the respiratory pro- 

 thoracic horns are devoid of scales, but are annulated along 

 two-thirds of their posterior portion. The forked protru- 

 sions of the last abdominal segment of the pupa are short 

 and simple. 



10. Dasyhelea longipalpis, Kieffer, 1913. 



According to Rieth (1915) the larvae and pupae of this 

 species were found by R. Schmidt upon the filamentous 

 Algae in a pool containing salt water. Similar pupae were 

 found by N. von Hofsten in Miistermyre, in Gotland Island, 

 and in the pools of Horstel (with salt content 28*890 perl.). 



