African Phhlwtomic Diptera. 107 



at extreme base, last tliree aunuli clove-brown. Thorax : 

 grey markings on dorsum of usual type, median stripe 

 narrow as far as transverse suture, broader behind, where it 

 appears as a process directed forwards from between inner 

 ends of grey crescentic marks on hind margin, admedian 

 stripes narrow, terminating on each side in a grey triangle 

 behind transverse suture ; pectus, pleurae, and sides of 

 dorsum smoke-grey. Abdomen : median stripe on dorsum 

 of second segment broader than that on other segments, in 

 the shape of a triangle with apex directed forwards, not or 

 scarcely reaching front margin ; sides of dorsum and venter 

 smoke-grey, clothed with short appressed silvery hairs, 

 ventral surface of third to seventh segments inclusive with a 

 broad clove-brown median blotch clothed with black hair, 

 the blotches together forming a median longitudinal stripe, 

 which is interrupted by the pale hind margins of the 

 segments. Wings : extreme base, first and second costal 

 cells, and third costal and marginal cells as far as commence- 

 ment of stigma milky ; rosette round distal extremities of 

 basal cells strongly marked though irregular, with a process 

 from its inner border extending as a zigzag light mark across 

 anal and axillary cells down to liind margin of wing ; a large 

 milky blotch occupying distal extremities of axillary and 

 anal cells ; a light spot in extreme basal angle of axillary 

 cell, in front of which is an angulate light mark, with apex 

 of angle directed away from base of wing ; rosettes round 

 fork of third longitudinal vein and distal extremity of discal 

 cell small and often much broken up ; against a light back- 

 ground base of upper branch of third vein appears inf uscated ; 

 stigma rather short ; dark quadrate blotch below stigma not 

 diminishing in width until it reaches first posterior cell ; at 

 distal end of stigma a small, more or less complete, semi- 

 quadrate milky loop or elongate curved mark next costa, its 

 proximal extremity continuous below Avith proximal border 

 of distal rosette ; outer ramus of apical sinuous mark some- 

 times very faintly marked ; a series of larger or smaller, 

 more or less conspicuous milky blotches on hind margin, 

 occupying distal angles of first, second, third, and fifth 

 posterior ceils ; usual series of detached oblique light marks 

 across posterior cells more or less confluent with marginal 

 blotches ; discal cell with proximal extremity, a transverse 

 mark at end of proximal third (sometimes connected with 

 proximal extremity), two small spots (sometimes connected) 

 at commencement of distal fourth, and in some cases a small 

 fleck beyond these milky ; first basal cell with base and 

 a transverse mark just before middle, second basal cell with 



