114 BITING-LOUSE OF THE HORSE. 



head, so much so that their base is nearly in line \Yith the 

 front border of the head. All claws are slender. The first 

 segment of the thorax is narrow, the second broader but 

 shorter. The cylindrical abdomen is yellow with dark bands 



Fig. 86. — Biting-louseof the horse and ass. Greatly- 

 enlarged. After Giebel. 



across the segments. The whole bod\^ is coyered with short 

 hairs. General color brown. Length 1.5 to 2mm, (Fig. 86), 



BITING-LOUSE OF THE HORSE. 



( Trlchodectes parumpllosas Piaget). 



This is a yery common parasite upon our horses, especially 

 upon the younger ones kept in pastures. Their presence be- 

 comes decidedly manifest in stables 

 towards spring, and the irritation 

 caused by their presence makes the 

 infested animals yery restless, so that, 

 in their attempts to rid themselyes 

 of their tormenters, they rub off all 

 the hair upon infested places of their 

 skins. The neck, base of tail, and 

 space between the legs are particularly 

 inyaded. 



Though resembling both the sca- 

 lariH and plloxus. it is readily distin- 

 guished from both b\^ good and con- 

 stant characters. Its head is yery 

 decidedly rounded in front, form- 

 ing a regular semi-circle; the antennje are inserted well 

 back; the abdomen is more slender and tapering than that 

 of the c^fca/a/'/.v, but less so than that of the 7;^7c\s^<.s^ Head, 



1 



Fig. 87. — Biting-louse of 

 thehorse. Greatly enlarged. 

 Original. 



