94 Veterinary Medicine. 



ris, Gonioides, Goniocotes, Decophorus, Trinoton, Colpocephalum , Meno- 

 pon. Symptoms : Irritation, slight or causing rubbing, to ulceration, slough- 

 ing or abscess, staring coat, ruffled feathers. Symptoms in Solipeds, chiefly 

 on mane, forelock, tail and adjacent parts. Symptom,s in Cattle, chiefly on 

 ears, spine, neck, chest, rump. Sym,ptoms in Sheep and Goat, cuts and 

 mats wool, great itching. Symptoms in Pig, rubs, bites, scratches, rolls in 

 mud. Sym.ptom.s in Dog, irritation, scratching, depilation, abrasions, erup- 

 tions, sloughs. Symptoms in Cats, licks, bites, scratches. Sym,ptoms in 

 Birds, head, neck, under wings, erect feathers, pecking, scratching, flap- 

 ping wings, rolling in dust. In all genera, can find nits and lice. Preven- 

 tion : Exclude infected ; carbon bisulphide in open bottles in empty build- 

 ing, clean and dust thickly with quicklime, wash with bleaching powder, 

 creoliu, tar water, naphthalin, mercuric chloride, potassium sulphide, fumi- 

 gate often. Trealm.ent : Mercurial ointment, tar, tobacco, sulphur, potas- 

 sium sulphide, calcium sulphide, hellebore, naphthalin, creolin, insect pow- 

 der often repeated or in dust baths, sulphur smoke bath, oil whole surface, 

 etc. 



The parasites known as lice belong to two very different fami- 

 lies, the PediculidcB and the Mallophaga. Both are wingless and 

 compulsory parasites but they differ essentiall}- in the structure 

 of their head, and proboscis and their manner of feeding. 



The Pediculidee (Haematopinus) are characterized by a long, 

 narrow head and a protractile sucking proboscis, formed of an ex- 

 ternal .soft sheath with two lips the lower having one or two hooks, 

 and within these a hollow stylet by which the skin is perforated 

 and the blood drawn. 



The Mallophaga or .SzVijfZzVe (Trichodectes) have the head 

 broader than the prothorax and are furnished with no sucking 

 tube, but bite the skin with their short, but powerful, curved and 

 usually serrated mandibles. They live on cuticular structures, 

 epidermis, exudates, scabs, hairs or feathers. 



IvICE OF HORSE, ASS AND MULE. 



Haematopinus Macrocephalus. Large Headed Horse 

 Louse. Head very long and narrow, much longer than the 

 thorax ; antennae long and starting from special tubercles ; abdo- 

 men oval, narrowed in front, with sinuous margins, having 

 stigmata, one on each ring ; head and abdomen yellowish gray ; 

 thorax brown maroon. Length 2.5 mm. to 3.5 mm. 



