THE DIPTERA OF CLYDE. 7 



4. Cephalodiscus nigrescens, Lank. — A fragment of this mag- 

 nificent species of Cephalodiscus was exhibited. The only 

 sjDecimens known were obtained by the " Discovery," and they 

 have been described by Lankester. 



5. Phoronis australis, Hasw. — This is the largest species 

 known of the interesting genus Phoronis. It has been described 

 by Haswell from the Australian coast. 



6. Specimens of the remarkable pelagic larvae (Leptocephalus) 

 of the conger and of the common eel. Along with the larva 

 of the common eel was shown a specimen which had just com- 

 pleted its metamorphosis into the elver or young eel, which is 

 so frequently seen making its way up our fresh-water streams 

 from the sea. 



7. Glossina palpalis, Rob. Desv., one of the " Tsetses " of 

 tropical Africa. This species has recently become notorious by 

 its having been proved to be the intermediary in carrying the 

 Trypanosoma of sleeping sickness from one human being to 

 another. The fact of this fly being viviparous, the young being- 

 born in an advanced stage of development, places great, pro- 

 bably insurmountable, difficulty in the way of carrying out a 

 war of extermination against the insect, even within limited 

 areas. 



The Diptera of Clyde (Second List). 

 By Robert Henderson. 



[Read 27th March, 1906.] 



Following the plan adopted in my former paper (Trans. Nat. 

 Hist. Soc. Glas., Vol. VII. (New Series), Part II., pp. 148-154), 

 I have distinguished thus (*) the species not given in Mr. P. H. 

 Grimshaw's list (Fauna and Flora, &c, of Clyde, 1901), and the 

 species so distinguished in my former contribution are, in the 

 list given below, marked thus (**) wherever their occurrence in 

 other localities is recorded. 



