170 ENTOMOLOGY FOR MEDICAL OFFICERS 



In the males of the G. fusca group that Newstead has 

 examined, the large claspers are more or less claw-like — some- 

 times with bicuspidate tips — and are not interconnected by 

 a membrane. 



The species of this and the following group are of larger 

 size than those of either of the other groups ; the smallest 

 females are never less than lo mm. in length and the 

 largest sometimes exceed 13 mm. 



(d) Synopsis of the Species of the Glossina brevipalpis 

 Group : after Austen. 



Dorsum of thorax with four sharply-defined, dark brown, 

 more or less oval or elongate spots, arranged in a 

 parallelogram, two in front and two behind the trans- 

 verse suture. Proboscis-bulb with a sharply-defined 

 brown or dark brown tip G. longipennis. 



Dorsum of thorax without such spots. Proboscis-bulb not 

 brown or dark brown at tip = 2. 



'Wings with upper thickened portion of anterior cross- 

 vein much darker in colour than the adjacent 

 veins, and thus standing out conspicuously against 

 2. \ the rest of the wing G. brevipalpis. 



Wings with the part in question not much darker, 

 and thus not standing out conspicuously — wings 

 practically unicolorous G. medicorum. 



The males of this group, so far as they have been ex- 

 amined by Newstead, have claspers of the G. fusca type. 



Glossina palpalis, Robineau-Desvoidy. 



According to Austen this species occurs (in suitable 

 natural stations) over the whole of western Tropical Africa, 

 from the mouth of the Senegal (about lat. 16° N.), eastwards 

 by southwards to the southern Bahr-el-Gazal (about lat. 8° N.), 

 then southwards along the basins of the Nile and of 

 lakes Victoria and Tanganyika, then westwards by south- 

 wards to Benguela (about lat. 13° S.). Within this range, 

 suitable conditions being present, it is usually found between 

 sea-level and 3000 feet, and has not, according to Bagshawe, 

 been recorded at an altitude above 4000 feet. 



