BLOOD-SUCKING ARTHROPODA. 
97 
Leptidae (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 blooel-sncking 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, Hcematobia, 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* 
Hippoboscidae. 
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 Hippobosca, Allobosca, Ortholfersia, 
Lipoptena, and Melophagus. The genus Hippo¬ 
bosca is probably represented throughout the 
world, and, with one exception,t its seven or eight species are 
* A species of Stomoxys, abundant in Mauritius during 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 Royal Army 
Medical Corps,” Nov. 1905, pp. 623-620. 
f Hippobosca struthionis, Janson, which is said to be found on ostriches in 
Cape Colony, 
Fig. 11. — Hqypobosca 
mjipes, v. Olfera. 
GiiqualaDd West, S. 
Africa (x 2). 
