GENUS HAEMATOBIA 369 



abrasions may result which will vitiate the experiments. In this case 

 it is best to cut the hair close to the skin. 



GENUS HAEMATOBIA, AUDINET SERVILLE 



Medium -sized flies of a brownish yellow colour; body robust ; head in 

 profile not nearly as straight as in Stomoxys, and the posterior sinuosity 

 of eyes much less marked. Sexual dimorphism marked, the males nearly 

 always brownish throughout ; the females are greyish with reddish yellow 

 legs. Frons in male narrow, about one-eighth total width of head ; in 

 female about half total width of head. Arista with seven bristles on its 

 upper surface, and two or three on its lower. Palp distinctly club-shaped, 

 and as long as the proboscis. Thorax covered with fine bristles, and 

 marked with four somewhat broad longitudinal bands. Thoracic chaeto- 

 taxy (macrochaetae) : Humeral 3 ; posthumeral I ; notopleural 2 ; pre- 

 sttturaf I ; supra-alar I ; intra-alar I ; post-alar 2 ; dorsocentral 4 or 5 ; 

 acrostichal I ; mesopleural 10 or 11 ; sternopleural 2. Abdomen with a 

 central longitudinal stripe, and lateral spots on most of the segments. 

 Wings pale or tinged with yellow ; first longitudinal vein spinulose or 

 nude at its base ; third vein always spinulose at its base. Fourth longi- 

 tudinal vein curving upwards in its apical portion exactly as in Stomoxys ; 

 first posterior cell distinctly more broadly open than in Stoinoxys. 



Haematobia stimulans. Meigen. Male. Yellowish brown, with four 

 somewhat broad longitudinal bands on the thorax, the outer pair inter- 

 rupted at the suture. In many specimens there is an indistinct fifth band 

 at the lower border of the mid-dorsum of the thorax. Abdomen with an 

 interrupted somewhat narrow median longitudinal stripe, and a large 

 triangular lateral spot on the second segment ; a smaller circular spot on 

 the third, and a still smaller spot on each side of the fourth. 



Female- (Plate XLVIII, fig. 1.) Slate grey to yellowish grey, with 

 very much narrower admedian thoracic bands than in the male, and with 

 two lateral spots ; abdominal markings as in the male, except that the 

 lateral spots on the fourth segment are wanting. Legs reddish yellow. 



This species is widely distributed in Europe from the north to the 

 south. Its breeding habits and early stages are very similar to those of 

 Stomoxys, and have been studied by Portschinski. 



Haematobia sanguisugens, Austen. This species is allied to stimul-a-ns 

 but differs in the following respects ; it is distinctly smaller, and the cen- 

 tral longitudinal stripe on the abdomen is continuous throughout its 

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