BLOOD-SUCKING ARTHROPODA. 



97 



Leptidse (no English names known). 

 The Leptidse are a small but widely distributed family of slenderly- 

 built Hies of moderate size, the majority of which normally prey 

 upon other insects. Up to the present the blood-sucking habit has 

 been observed in the case of only four or five species. 



Muscidae (Tsetse-flies ^ and their allies). 

 In this family the blood-sucking habit is highly exceptional, and 

 is confined to a very few genera and species, all of which in appear- 

 ance present a general resemblance to the Common House-fly. In 

 cases in which the blood-sucking habit occurs, it appears to be common 

 to both sexes. The following are the blood-sucking genera of Muscidse 

 hitherto described : Stomoxys (this genus is universally distributed), 

 Lyperosia, Hcematohia, Beccarimyia, and Glossina, or Tsetse-flies. 



N.B. — In view of the near relationship between Stomoxys and 

 Glossina (Tsetse-flies), it is desirable that special attention should 

 be paid to the former in order to discover 

 whether the species of this genus are capable 

 of conveying any species of Trypanosoma.* 



HippoboscidsB. 



This family, which is distributed throughout 

 the world, includes a number of small genera, the 

 species of which are all parasitic on mammals 

 and birds. From the point of view of possible 

 dissemination of disease, however, it is unneces- 

 sary to consider here the bird- and bat-parasites. 

 The other mammal-parasites are comprised in 

 the genera Hip'pobosca., Allohosca, OrtJiolfersia, 

 Lipop)tena., and Melophagns. The genus H%pp)o- 

 hosca is probably represented throughout the 

 world, and, with one exception,t its seven or 



Fig. 11, — H'ippoJ)Osca 

 rafipes, v. Olfers. 

 Gviqualand West, S. 

 Africa (x 2). 



eight 



species are 



* A species of StnmoxyR, abundant in Mauritius duiing the hot season, has 

 just (Nov, 1905) been announced to be the "almost certain" disseminator of 

 Surra in that island. See Lieut. -Col. Manders, " Journal of the Koyal Army 

 Medical Corps," Nov. 1905, pp. 623-62G. 



f Hippuhosca strutlnonis, Janson, which is said to be found op. ostriches in 

 Cape Colony, 



