30 MONOGRAPHIA 



convex, nearly twice the width of the head, concavo- truncate 

 before and behind, with a deep oblong diagonal furrow on 

 each side, in front of the spiraculum, basal margin much 

 depressed ; abdomen large ovate, grayish white, or ochra- 

 ceous gray, shining and smooth, with four longitudinal rows 

 of fuscus horny excrescences, the lateral ones surrounding 

 the spiracula ; sutures well defined and hairy, the last seg- 

 ment with two uncinate black marks; legs chestnut, very 

 long and thick, especially the four anterior ; tibia acutely 

 toothed ; tarsus very large ; ungues strong and black at the 

 extremity. Length 1 to 1^. 



Very common on Oxen, especially the mane and shoulders, 

 where these animals are frequently observed to be devoid of 

 hair, which has been rubbed off in order to rid themselves 

 from the irritation caused by numbers of these insects 

 which are there congregated. The young are much more 

 agile than the mature insect, and differ in nothing except 

 a want of proportion, the limbs being much thicker as com- 

 pared with the bulk of the body, than when adult. 

 Length 1 to 1. 



7. HSEMATOPINUS VENTRICOSUS. Denny. (Louse of the 

 Rabbit.) 



Plate XXV. Fig. 6. 



Dull chestnut; head sub-lyrate; abdomen large, inflated, 

 cadaverous white; tarsi chestnut. 



Head large, sub-lyrate; occiput very broad, rotundate ; 

 eyes small, flat, seated upon a temporal projection near the 

 base, with a few stiff hairs in front ; antennae long, the first 

 joint broad and much the largest, second cylindrical, the 

 remainder nearly equal ; thorax very short, transverse, 

 narrower before than behind, channelled in the centre, base 



