142 Veterinary Medicine. 



appear in pairs, then a series of medium sized teeth, three abreast 

 in transverse rows. Palpi bear strong bristlj' hairs. 



Male. May be 4 to 8 mm. long, by 2.5 to 5 mm. broad. Dart 

 and mandibles as in female. Palpi one-sixth longer than man- 

 dibles. Genital pore narrower than head (in the female is as 

 broad as head). 



Larva. These are small and round (diameter about 700 fi.) 

 or broader from side to side. Capitulum (head) shows more in 

 front of the anterior margin of the body than in mature. Legs 

 relatively long, (II shortest) stout and covered with penniform 

 hairs. Palpi 258 /j. long, fourth article longest (loo/u.). 



Distribution. This tick is found in the Southern United States, 

 largely on chickens but also attacking turkeys and other birds. 

 It has been once found on cattle. As a night prowler it renders 

 the nest intolerable for the sitting bird and often drives it to 

 abandon its eggs. Otherwise it produces great anaemia and 

 wasting, and not infrequently destroys life. 



Argas Reflexus. A. Marginata. Rynchoprion Colum- 

 bae. The Argas , of Pigeons. Head (capitulum) i mm. with 

 rounded point. Dart (hypostome) with two rows of recurved 

 teeth on each side of the median line with the beginning of a 

 third row near the end. The fecundated female is 5 mm., by 3 

 mm. fasting, or 6 mm. by 4 mm. after gorging. The male is 

 smaller, and brown. 



This is common in pigeon houses in France and Italy, attack- 

 ing the pigeons on the neck, chest, wings and other parts of the 

 body especially of the young, producing anaemia, emaciation and 

 death. In the older pigeons they may drive hatching pigeons 

 from their nests and prevent encrease. 



Men and particularly children often suffer, and when the dove 

 cots adjoin human dwellings the latter are invaded and the in- 

 mates attacked. The feet and hands are mostly attacked and 

 though the resulting wound may be but a red point without 

 areole, yet the whole limb may become the seat of intense itching 

 up to the shoulder or buttocks. 



They are very tenacious of life, living for 22 months without 

 food (Ghiliani), and they reproduce their kind even when de- 

 prived of the blood of animals (Boschulte). 



Treatment must proceed on the same lines as for Ixodes, and 



