Life-history of Dasylielea obscura, Winnertz. 585 



3. Dasyhelea hippocastani, IMik, 1888. 



This species was reared by Mile (1888) from larvre and 

 pupie found in ulcerating wounds of yEsculushippocastamnn. 

 Tin Fortunately tlie larvse and pupse are very insufficiently 

 descrii)ed and figured. 



4'. Dasyhelea obscwa, Winnertz, 1852. 



The eggs, larvse, and pupse of this species are for the first 

 time described in the present paper. 



5. Dasyhelea obscura, var. goetghebueri, KiefEer. 



According to F. W. Edwards, the larvae and pupae of this 

 species were described by Goetghebuer (1914) under the 

 name of Culicoides versicolor, Winnertz. From Goet- 

 ghebuer's description and figures it appears that the larvne 

 and puppe of this species differ in many respects from 

 those of D. obscnra. 



{a) The number of post-abdominal hooks of the larva in 

 Goetghebuer's species is 14, while in D. obscura 

 there are only 12. 



[b) The rectal gills are more elongated and of a type 

 similar to those of D. flavifrons [cf. text-fig. 13). 



(a) The prothoracic horns of the pupa show the scales 

 only in their middle portion, and the number of 

 papillae is reduced to about 12, while in D. obscura 

 it is 21 to 22. 



These differences show that the species described by 

 Goetghebuer under the name of C, versicolor cannot be 

 regarded as a mere variety of obscura, but has to be separated 

 as a new species ; it would be better to reserve for it the 

 specific name of D. goetghebneri, alreadv given to it by 

 Kieffer (1919). 



6. Dasghelea versicolor, Winnertz, 1852. 



Tiiis midge has been reared l)y Miss Stow from humus 

 surrounding the roots of Spircea ulmarla (Grantham, Lines), 

 and by F. W. Edwards from the scum on the surface of an 

 aquarium (Hitchin, Herts). The pupae of this species which 

 I have received from Mr. F. W. Edwards differ very little 

 from those of D. obscura. All I can say at present is that 

 the few pup«3 of D. versicolor which I have examined are 

 more strongly chitinized, that the 3 medio-dorsal spots of 

 the abdominal segments are more prominent, and that the 

 scales and hooks covering the abdominal segments are 

 more developed than is the case in the pupre of D. obscura. 



