HEX APOD E DERMATOSES 



2207 



tion and cicatrization are absent, but perhaps these may be only 

 differences in details and not in essentials. 



Prognosis. — This is good. Cases recover fairly rapidly and as 

 a rule-without cicatrization, hence the outlook as regards rapidity 

 of cure and the absence of scarring is good. 



It will, however, be remembered that P. Da Silva describes a much 

 severer form of dermatitis than that mentioned here, and that 

 this was followed by cicatrization. 



Treatment. — -The best treatment is to prick the blister and apply 

 a dressing of i in 80 carbolic acid, but the majority of the victims 

 just let the lesions alone, and they heal up rather more slowly than 

 when treated and are more painful. If they become rubbed, they 

 are often very painful. 



3. Dermatites caused by Stings of Adults. 



Stings are mainly caused by species belonging to the family 

 Apidse of the Hymenoptera, which includes the bees and wasps. 

 A description of these stings will be found on pp. 219-222. 



4. Dermatites caused by Larvae. 



The larvae of various species of the (Estridae and Muscidae are 

 compelled to undergo their development in the skin of some warm- 

 blooded animal, and as these are plentiful, as a rule the flies do not 

 attack man, who only occasionally suffers from their effects, and 

 when he does the pathological condition is usually named dermal 

 myiasis (p. 1631). Other larvae — as, for example, that of Auchmero- 

 myia luteola Fabricius, 1805 — are blood-suckers. 



Blood- SUCKING Dipterous Larv^. 



Only a very few blood-sucking dipterous larvae are known, and 

 these belong to two genera, which may be distinguished from one 

 another as follows: — 



A. Abdomen long and narrow, with unequal segments and 



distinctly longer than the thorax — Auchmeromyia Schiner 

 and Bergenstamm, 1819. 



B. Abdomen short and broad, with equal segments and but 



little longer than thorax — ChcBVomyia Roubaud, 191 1. 



There are two species belonging to the last-named genus — viz: — 



Cheer omyia cheer ophaga Roubaud, 191 1. 

 ChcBromyia honeti Roubaud, 191 1. 



Neither are known to attack man. They live in the burrows of 

 the wart-hog and the ant-bear in the Sudan. There are also two 

 species belonging to Auchmeromyia — viz: — 



Auchmeromyia luteola (Fabricius, 1805). 

 Auchmeromyia prc&grandis Austen, 1910. 



Both these may attack man. 



