African PJdehotomic Diptera. 291 



foiirtlis of first joint of middle and hind tarsi dull ochraceous 

 buff, first joint of front tarsi sometimes faintly lighter 

 (chestnut) at base. 



Angola : type and five other specimens from either 

 Bailundo or Kwanjulula, November to December 1904 

 {Dr. F. Creighton Wellman) ; two additional specimens from 

 Bailundo, April 1905, '' taken at a point about 175 miles 

 south-west of the most easterly locality at which the previous 

 examples of this species were found " {Dr. F. C. IVelbnan) ; 

 two specimens from Benguella, June 1905 {Dr. F. C. JVell- 

 mayi). Concerning the first series met with the collector's 

 field-note is as follows : — " About 70 specimens taken in 

 small plains covered with tall grass, 230 to 310 miles from 

 coast. Sluggish." The ten specimens of this species just 

 enumerated exhibit a somewhat remarkable range in size ; 

 since one of the examples taken in April is considerably 

 smaller than the rest of Dr. Wellman's series, while those 

 collected in November and December are larger than the 

 others, there may perhaps be some seasonal explanation of 

 the phenomenon. 



Hmnatopota pallidimarg'mata is not closely allied to any 

 other species at present known to me, and its general dark 

 coloration, combined with the conspicuously banded abdo- 

 men and inconspicuously banded tibiae, should enable it to 

 be recognized without difficulty. 



H(Bmatopota desicUosa, sp. n. 



? . — Length (1 specimen) 8 mm. ; width of head 2'5 mm. ; 

 width of front at vertex 1 mm. ; length of wing 8'25 mm. 



Dark sepia ; dorsum of thorax with usual three light grey 

 or smoke-grey longitudinal stripes ; dorsum of abdomen ivith 

 extreme hind margins of all segments narrowly cream-coloured, 

 second and folloiving segments each with a pair of ill-defined 

 yellowish grey spots, ivhich are widely separated and on several 

 segments more or less confluent with the yellowish grey lateral 

 borders ; ivings mouse-grey , light markings distinct and sharply 

 defined, usual three rosettes present, apical sinuous mark, at 

 least in typical specimen, umisually ividely separated from distal 

 rosette ; legs dark brown, femora greyish pollinosc, middle 

 femora greyish cinnamon, a single ill-defined band close to base 

 of front tibia and two ill-defined bands on middle and hind 

 tibicp respectively cinnamon. 



Head : front mouse-grey, extreme lateral margins and a 

 narrow border surrounding each lateral frontal spot light 



20* 



