Genera and Species of Blood-sucking Muscidge. 291 



specimens) 3'5 to 4*25 mm. ; width of head, ^ TS mm., 

 ? 1-4 to 1-6 mm. ; width of front at vertex, ^ 0'25 mm., 

 ? 0*5 to 0"75 mm. j length of proboscis 1*4 mm. ; length of 

 wing 4 to 48 mm. 



Mouse-yrey or slate-yre])^ clothed with short black hair, 

 bristles also black ; palpi buff ; dorsum of thorax ivith a pair 

 of extremely narrow, widely separated, parallel, longitudinal^ 

 admedian, blackish stripes, a somewhat triangular blackish 

 mark extending backwards from inner end of each humeral 

 callus, and an elongate blackish streak in a line ivith latter 

 mark behind transverse suture [two outer marks less distinct in 

 ? ) / dorsum of abdomen with a narrow, interrupted, longi- 

 tudinal, median, clove-brown stripe, and, on second and third 

 segments, paired transverse, roughly triangular, c'ove-brown 

 blotches, the pair on second segment especially large ; wings 

 hyaline or tinged with tawny olive in J' , hyaline in ? ; femora 

 greyish clove-brown, extreme tips ochraceous-buff, one or more 

 pairs sometimes more or less brownish except at base, tarsi 

 dark brown. 



Head: frontal margins and sides of face light grey or 

 yellowish grey ; frontal stripe clove-brown, in (^ narrow, 

 somewhat attenuate in middle, where its width is approxi- 

 mately equal to that of frontal margin, in ? broad, at least 

 twice or rather more than twice as broad as frontal margin, 

 with its outer edges convex ; palpi clothed on outer side 

 with black bristles ; proboscis burnt umber-coloured, dark 

 brown at tip, projecting slightly beyond palpi ; antennae, 

 including arista and its hairs, clove-brown, arista with a 

 lighter band. Thorax : admedian stripes not diverging 

 posteriorly, sharply defined from front margin to a point 

 about midway between transverse suture and prsescutellar 

 furrow, after which their continuations to prsescutellar 

 i'urrow are broader and less clearly marked ; transverse 

 suture blackish ; thoracic markings not so conspicuous in ? 

 as in c? . Abdomen: anterior margin of second and following 

 segments black and shining, broader towards sides, espe- 

 cially conspicuous in ? ; median stripe commencing on 

 front margin of second and extending to or not quite 

 reaching middle of fourth segment, widely interrupted 

 before meeting hind margins of second and third segments; 

 dorsum of first segment in ? sometimes with a pair of clove- 

 brown blotches, much smaller than those on two succeeding 

 segments ; dorsum of fourth segment in some specimens 

 with traces of a pair of small dark spots ; venter yellowish 

 grey, median scutes clove-brown. Squama and halteres 

 cream-buff. Legs : in oue female posterior femora are 



