220 Mr. E. E. Austen on new 



ground, remains of the usual rosettes round the fork of the 

 third vein, distal extremity of the discal cell, and distal 

 extremity of the second basal cell can be seen more or less 

 distinctly in different specimens ; appendix to upper branch 

 of third vein rather long. Halteres mummy- brown, stalk 

 ochraceous buff. 



Angola : type and five other specimens from Benguella, 

 February 1905 (Dr. F. Creiyhton Wellman). Dr. Wellman 

 sends the folloMing note Avith reference to this species : — 

 " Found in sedgy and grass-grown marshes, near large 

 streams. Like others of its genus, a vicious biter ; fairly 

 active; twelve specimens taken."' The collector is to be 

 congratulated on the discovery of this remarkable species, 

 which, owing to its peculiar coloration, cannot be confused 

 with any of its congeners known to me from any part of the 

 world. 



Hccmatopota denshamii, sp. n. 



?. — Length (6 specimens) 9-6 to ll'S mm.; width of 

 head 2*8 to 3 mm. ; width of front at vertex 1 mm. ; length 

 of wing 8"6 to lOS mm. 



Olive-brown, with Jive olive-grey longitudinal stripes on 

 dorsum of thorax, and a narrow median light stripe on 

 abdomen ; frontal callus black ; ivings tinged with buff, and 

 ivith a broun border to the tip and hind margin, as far as the 

 end of the sixth vein ; coxce dark grey, femora olive- or greyish 

 brown. 



Head smoke-grey to yellowish grey, vertex with a pair of 

 faint light brown longitudinal stripes, which meet together 

 above callus ; frontal callus of moderate depth, its upper 

 margin slightly convex and rising to a point in the median 

 line, which in rubbed specimens may be produced into a 

 shining ridge ; brown spot on each side of front usually 

 well marked, median frontal spot absent ; palpi pinkish buff, 

 elongate, blunt at the tips, clothed with black interspersed 

 with light yelloAvish hair ; first and second joints of antenna 

 ochraceous buff, first joint not swollen, expanded portion of 

 third joint dark brown, rufous at the base, last three annuli 

 black, last auuulus equal in length to the two preceding 

 annuli taken together. Thorax : median stripe on dorsum 

 only half as wide as admcdian stripes, latter wider in front; 

 pleura; and pectus olive-grey. Abdomen clothed with minute, 

 appressed, bufl-yellow hairs ; venter olive-grey on each side. 

 Wings : light markings rather coarse ; against a dark back- 

 ground remains of the usual three rosettes can be distin- 

 guished, otherwise the markings are confined to the brown 



