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A NEW SPECIES OF STYGEROMYIA (FAMILY MUSCIDAE, 

 SUB-FAMILY STOMOXYDINAE) FROM THE EAST AFRICA 

 PROTECTORATE. 



By Ernest E. Austen. 

 {Published by permission of the Trustees of the British Museum.) 



Genus Stygeromyia, Austen. 



The genus Stygeromyia, so far as is at present known, is confined to the 

 Ethiopian Region. The species described below, of which the type is in the 

 British Museum (Natural History), is the third to be discovered. 



Stygeromyia woosnami, sp. n. 



c?. — Length (1 specimen) 8 mm. ; width of head 2*8 mm. ; width of front at 

 vertex between 0*5 and 0*6 mm. ; length of wing 9 mm. ; greatest width of wing 

 3'75 mm. 



Grey, with conspicuous clove-brown or dark brown markings on dorsum of 

 abdomen, and ivith relatively large, hyaline wings. Distinguished from both 

 Stygeromyia maculosa, Austen, and S. sanguinaria, Austen {the only species of this 

 genus yet described), by its much larger size ; further distinguished from S. maculosa 

 by its more strongly marked thorax and very different abdominal markings, and 

 from S. sanguinaria by the frontal stripe being much darker {clove-brown instead 

 of walnut-brown) and distinctly wider below {instead of, as in <$ of S. sanguinaria, 

 of practically uniform width throughout), by the proboscis being clove-brown instead 

 of orange-buff or ochraceous-buff, and by the femora being strongly suffused with 

 dark grey instead of mainly buff or ochraceous-buff. 



Head light grey (occiput, except posterior orbits, dark grey), sides of face and 

 spot above base of antennae shimmering yellowish silvery, all hair and bristles, 

 like hair and bristles on rest of body and on legs, black ; frontal stripe equal in 

 width to the sides of the front (frontal margins or parafrontals) taken together ; 

 palpi ochraceous, bluntly rounded at tips, and beset with black bristles on outer 

 side ; first and second joints of antennae greyish cinnamon-rufous, third joint 

 slate-grey (faintly orange-rufous on under side at base), terminal joint of arista 

 clove-brown, with 11 hairs. Thorax : dorsum marked with five longitudinal 

 stripes, of which the paired admedian stripes are the darkest, being clove- brown 

 and very sharply defined and conspicuous when the insect is viewed at an obtuse 

 angle from behind ; in middle line is a mummy-brown and less sharply defined 

 stripe, which commences a little way behind front margin, broadens out into a 

 lanceolate shape after crossing transverse suture and terminates just in front of 

 prescutellar groove ; admedian stripes extend from front margin to a point on a 

 level with middle of postalar calli ; on each lateral half of dorsum, between 

 admedian stripe and lateral margin, is a much broader dark brown stripe, which 

 commences immediately behind humeral callus, is widely interrupted by transverse 

 suture, and terminates slightly in front of level of anterior extremity of postalar 



23527 G 



