Life-history of Dasylielea obscuva, Winnerlz. 585 



3. Dasyhelea hippocastani, Mik, 1888. 



This species was reared by Mik (1888) from larvcX' ami 

 pnpie found in ulcerating wounds of yEsciilns hippocastannin. 

 Unfortunately the larvee and pupse are very insufficiently 

 described and figured. 



4. Dasyhelea obscura, Winnertz, 1852. 



The eggs, larvae, and pupse of tliis species are for tlie first 

 time described in the present paper. 



5. Dasyhelea obscurn, var. goetghebueri, Kieffer. 



According to F. W. Edwards, the larvae and pupse 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 larvae 

 and pupEe of this species differ in many respects from 

 those of D. obsciira. 



(a) The number of post-abdominal hooks of the Lirva in 

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

 there ai'e only 12. 



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

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



(c) 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 resei've for it the 

 specific name of D. goetghebueri^ already given to it by 

 Kieffer (1919). 



6. Dasyhelea versicolor, Winnertz, 1852. 

 This midge has been reared by Miss Stow from humus 

 surrounding the roots of Spiraa tihnaria (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 puppe of D. versicolor which I liave examined are 

 H^ore strongly chitinized, that the 3 raedio-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. 



