CHRYSOPS DIMIDIATUS. 81 



length, even where this veiu traverses the hyaline portion 

 of the wing. 



A 9 from Chimfimo (S. W. Africa), presented by the 

 late A. B. van Medenbach de Rooy. 



Among the described African species of Chrysops, there 

 is but one which may be taken into consideration here on 

 account of the pattern of the wings, viz. Chr. conjluens 

 Low (Dipt. S. Afrika's p. 102 n^ 4 pi. 1 fig. 19); this 

 species however has distinct light points in the dark por- 

 tion of the wings and moreover a uniform black abdomen. 



35. Diachlorus diversipes , Macq. 



Diahasis^) diversipes^ Macq. Dipt. ex. Supp. 3. 13. 2. 



A cf and 9 from Surinam. 



This species may be easily recognized from Macquart's 

 description , notwithstanding only the 9 was known to 

 him. In the centre of the face a large shining black callo- 

 sity is present, extending down to the oral margin but 

 not entirely up to the root of the antennae. Perhaps in 

 other specimens this callosity is divided into two parts, 

 for Macquart mentions »deux taches noires rondes". This 

 being the only difference , I consider the specimens of the 

 Museum identical with that of Macquart. 



In the cT the eyes are nearly coherent in their upper 

 portion , and the thorax has a rather dense , erect pilosity. 



Fam. Bovnhylidae. 



36. Exoprosopa doryca , Boisd. 



Anthrax dorycus , Boisd, Voyage de I'Astrolabe (Faune 

 de rOcéanie) II. 665. pi. 12 f. 12. 



Besides Anthrax ventrimacula Dol. , A. Pelops Walk, and 



1) The generic name Diabasis, being already used among the Coleoptera, 

 has been changed into Diachlorus by Osten Sacken. 



Notes from tlie Leyden Miuseum, "Vol. "VH. 



6 



