i6o Veterinary Medicine. 



mouth of hens. Fox. (Man, horse). Legs complete in male ; 

 without ambulacrum in female. 



Psoroptes Longirostris (Communis). Rostrum long, con- 

 ical ; body ovoid, anus marginal in both sexes. 



P. Longirostris varietas Equi. Horse. 



P. Longirostris varietas Bovis. Ox. 



P. Longirostris varietas Ovis. Sheep. 



P. Longirostris varietas Cuniculi. Rabbit. 



Symbiotes Communis (Spathiferus). Abdominal lobes of 

 male square, and carrying five hairs in two bundles, the largest 

 forming a spathe. 



6'. Equi. Horse. 



5*. Bovis. Ox. 



5. Ovis. Sheep. 



S. Capra. Goat. 



5. Cuniculi. Rabbit. 



Symbiotes Ecaudatus (Auricularum) The tailless Sym- 

 biotes. Cat, Dog, Ferret : in concha. 



Symbiotes Setiferus (Vulpi). Fox, neck, ears, tail. 



SARCOPTIC ACARIASIS IN SOLIPFDS. 



Sarcoptes scabei v. equi : Characters. Accessory causes : Poverty, crowd- 

 ing, filth, hot season or stable, mingling of animals, infected stalls, cars, 

 boats, pens, yards, fields, posts, stones, fences, clothing, combs, brushes, 

 rubbers, pole, shafts, harness. Susceptibility : S. of man may live on horse 

 40 days, also those of carnivora and goat. S. of horse may live on man 40 

 days, on ox, sheep and pig, dog and cat has very transient effect. On car- 

 case become torpid, but not dead, on cooling. Symptoms : Incessant, intol- 

 erable extending itching, rubbing, hairs bristle, twist, break, drop, but a 

 few remain, unlike ring-worm, scurf, abrasions, sores, pimples, pustules, 

 sloughs, swelling, corrugation ; discovery of acarus in sunshine or hot room, 

 scurf under microscope, or tied on arm. Diagnosis: From pruritus, moist 

 eczema, dermanyssus acariasis, psoroptic acariasis, symbiotic mange, phthi- 

 riasis. Prognosis : Favorable under good conditions. Lesions : Eruption, 

 channels in brilliant light. Treatment: Segregation, clipping, burning 

 hair, soaping, scrubbing, oil, apply acaricide. Relative activity of acari- 

 cides. Value of volatile and non-volatile acaricides ; poisonous or non-poi- 

 sonous to the horse ; suppression of perspiration. Acaricide formulas. Pre- 

 vention: Burn litter, soiled fodder, etc. ; clean and scald stable, sprinkle 



