516 Mr. E. E. Austen on new 



extreme tips of first and second joints of middle and hind 

 tarsi brown ; front tibi'cB moderately incrassated, middle and 

 hind tibiae not incrassatcd. 



Uganda : type and two other specimens from Kyadondo, 

 ^dm {Colonel David Bruce, C.B., R.A.M.C, F.R.S.) ■ other 

 specimens from Siugo, 1903 (Col. Bruce), Busoga, March 

 1906 {Dr. A. D. P. Hodges), and the Nile between Wadelai 

 and Nimule, 1906 {the late Dr. W. A. Densham). With 

 reference to the specimen obtained by him_, Dr. Densham 

 wrote : — " Only specimen seen ; taken at an opening in the 

 swampy river edge." I have pleasure in naming this species 

 in honour of the distinguished investigator, whose epoch- 

 making discovery of the cause of nagana (tsetse-fly disease of 

 animals) laid the foundation of all subsequent work upon 

 the aetiology and treatment of sleeping sickness and the 

 various forms of animal trypanosomiasis. 



Chrysops Brucei is not closely allied to any other African 

 representative of its genus hitherto described. In its abdo- 

 minal markings it presents a certain^ though not by any 

 means a close, resemblance to the following species ; but the 

 wing-markings (flecks at tips of;' second and upper branch of 

 third vein) are alone sufficient to distinguish it from all other 

 African species of Chrysops at present known. 



Chrysops inconspicua, sp. n. 



$ . — Length (3 specimens) 5 to 7^ mm. ; width of head 2 

 to 2i mm. ; width of front at vertex 4 mm. ; length of wing 

 5 to 6^ mm. 



Small species, vith rather broadly oval abdomen, the dorsum 

 of which is marked ivith conspicuous paired black spots or 

 transverse blotches, meeting in the middle line in front and 

 separated by triangular interspaces ; wings hyaline, with base, 

 costal border to end of second longitudinal vein, and an oblique 

 transverse band not extending beyond anal cell blackish broivn ; 

 anal cell infuscated, a clear space in first and second basal 

 cells near their distal extremities ; legs entirely black. 



Head. — Front olive-grey, jowls and sides of face chrome- 

 yellow poUinose; frontal callus very large, shining black, 

 shaped like an equilateral triangle, the apex including the 

 anterior ocellus; vertex with a pair of small, transversely 

 elongate, shining black flecks, one on each side of median 

 line and including one of the other two ocelli ; median 

 portion of lower part of face Avith a single large, somewhat 

 cordate, shining black tubercle, extending to margin of buccal 

 cavity ; no black fleck on jowls ; front, sides of face, and 



