20 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



12. Abdomen with a pair of chitinized plates on second sternite 



[Fahrenholzi] 

 Abdomen without such plates Haemodipsus (in part), p. 22 



13. Hind legs with stalked disk-shaped appendages on femur and tibia 



Euhaematopinus, p. 22 

 Hind legs without disk-shaped appendages [Haematopinoides] 



Haematopinus Leach. 



These are large species mostly occurring on Ungulates. The 

 antennae are five-segmented, the head broad posteriorly and the 

 legs all of nearly equal size. 

 H. eurysternus (Nitzsch). Short nosed ox louse. (PL i, 6.) 



Germar's Magazine, iii, 305, 1818. 



Of medium size, head short, abdomen broad, a broad black stripe 

 on the hinder middle area of the abdomen in the male. Length 

 3.5-5 mm. Common throughout the country and recorded for 

 Connecticut. 



Somers, 29 Nov., 1911. (Theop. Legere) : Storrs (G. H. L.). 

 H. suis (Linnaeus). Hog louse. (PL i, 7.) 



Syst. Nat., Edn. 10, 611, 1758. 



Large, head long, abdomen broad. Length 6-J mm. The com- 

 mon hog louse, very common on this animal but not known from 

 other hosts. Undoubtedly common in Connecticut. 



Storrs, 1 921 (G. H. Lamson). 



H. asini (Linnaeus) macrocephalus Burmeister. Horse louse. 



Syst. Nat., Edn., 10, 612, 1758. 



Head elongate, narrowed anteriorly, abdomen broad. Length 

 about 4 mm. This is the sucking louse of horse and ass, and while 

 not commonly as abundant as the lice of cattle and hogs, it must 

 certainly occur on horses generally and will no doubt be found in 

 Connecticut. 



Linognathus Enderlein. 



Head small without sharp projecting angles, the antennae with 

 five segments and the abdomen without chitinized plates. 

 L. vituli (Linnaeus). Long-nosed ox louse. (PL i, 4 and 5.) 



Syst. Nat., Edn. 10, 611, 1758. 



This is a slender long-headed species about 3 mm. long which 

 occurs on cattle. There are few records for Connecticut but the 

 species is probably fairly common. 



Storrs (G. H. L.). 

 L. pedalis (Osborn). 



Bull. 5, N. S., Div. Ent., U. S. Dept. Agr., 170, 1896. 



Head very short, abdomen broad, fusiform. Length 2.20 mm. 

 This species has been found only rarely but it is pretty certain 

 to be secured from sheep where it affects the hair of the lower part 

 of the legs. 



