112 BITING-LOUSE OF SHEEP. 
possesses on the first seven segments dark margins. Length 
ie (mime 
This insect has not as yet been reported from Minnesota, 
but as the interest in sheep-husbandry is becoming greater 

Fig. 83.—Biting-louse of sheep, showing 
Fig. 82.—Biting-louse of sheep; head with mouth-parts from ventral side; a, 
egg, soon after being laid; a, cap; a, antanne; b, b. continuation of dorsal su- 
b, where the cap is joined to the ture; c, c, ventral suture; d, d, mandibles: e, 
egg. Greatlyenlarged. After Cur- maxilla showing through skin; f, labrum. 
tice: Greatly enlarged. 
every year it is wise to look out for this parasite, which can 
not be as easily destroyed as many others, on account of the 
longer wool of the host. Wherever it occurs it causes great 
annoyance to the infested animals, which try to stop the 
continuous irritations by as constant scratchings and bit- 
ings. Those not familiar with the true sheep-scab are very 
apt to mistake this one for the other. During the time of 

Fig. 84.—Biting-louse of sheep, anterior leg; a, coxa; b, 
trochanter; c, femur; d, tibia; e, tarsi and claws, the 
latter grasping a hair. Greatly enlarged. Affer Curtice. 
clipping the sheep close attention should be paid to these 
parasites. Fig. 80 shows a male of this species, fig. 81 the 
female, and figs. 82, 83, 84 show the egg, head and front leg 
of this species, as well as the anatomical details. 
