372 MEDICAL ENTOMOLOGY 



Stygeromyia maculosa, Austen. Male. Thorax, ground colour grey, 

 with a pair of narrow admedian stripes extending to the posterior bor- 

 der, and two broader spots on each side near the transverse suture, one 

 in front of suture immediately behind the posthumeral bristle, and the 

 other behind the suture ; these thoracic markings are similar to those of 

 the female Haematobia stimulans (see Plate XLVIII, rig. 1). Abdomen 

 rounded, first segment without markings ; second, third and fourth with 

 elongated median brown spots, as well as spots at the sides, those on the 

 second segment being the largest. Female unknown. This fly is found 

 in Aden ; its breeding habits are unknown. 



Two other species, S. sanguinaria, Austen, and S. woosnami, Austen, 

 have been recently described from Africa ; the latter was caught in the 

 act of biting. 



GENUS LYPEROSIA, RONDANI. 



Very small to small flies, slate grey or greyish yellow to dark grey in 

 colour, with elongated bodies ; the abdomen usually twice as long as 

 broad. Frons in male very narrow, one-seventh to one-eighth total width 

 of head ; in female one-third total width of head. Arista with somewhat 

 long undulating bristles, on its upper surface only. Palp stout and 

 almost uniformly broad throughout its length ; it is as long as the 

 proboscis, to which it is closely applied. Thorax slate grey to dark grey, 

 with four well defined or indistinct dorsal stripes ; sometimes spots in 

 addition. Thoracic chaetotaxy (macrochaetae) : Humeral 2 ; posthu- 

 meral I ; presutural 1 ; notopleural 2 ; supra-alar I ; infra-alar I ; post- 

 alar /; dorsocentral 10, sometimes 1 2 , mostly small ; acrostichal I behind 

 suture and a row of four smaller bristles in front ; mesopleural 6 to 8 ; 

 sternopleural 3, arranged I : 2. Abdomen slate grey to dark grey with a 

 central longitudinal stripe on one or more segments. Wings hyaline, 

 fourth longitudinal vein curved gently upwards but much straighter than 

 in Stomoxys, Haematobia or Bdellolarynx. First longitudinal vein 

 joining the margin- opposite to, or in front of the inner cross-vein. 

 Third longitudinal vein without spines at its base ; first posterior cell 

 broadly open. 



The flies of this genus are of some importance, as they appear to 

 be the nearest allies of those of the genus Glossina. The structure and 

 position of the palps in relation to the proboscis, and also the scissor- 

 like position the wings assume when at rest, strongly recall Glossina. 

 Lyperosia exigua, Meij., however, often holds its wings upwards when 

 resting. They can be distinguished from most other species of the 



