2 2 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Haemodipsus Enderlein. 



Head short, widened behind, with antennae near the front. 

 H. ventricosus (Denny). 



Mon. Anopl. Brit., 30, 1842. 



Short and thick with the abdomen rounded. Occurs on the 

 rabbit, apparently the same species being found on the common 

 wood rabbit Lepus sylvatkus, the domestic hare, and the other 

 species of the genus Lepus. 



Neohaematopinus Mjoberg. 



The antennae are five-jointed, very close to the front of the head 

 and the basal segment has a stout spine or has the outer hind 

 angle produced. 

 N. sciuropteri (Osborn). 



Bull. 7, O. S., Div. Ent., U. S. Dept. Agr., 23, 1891. 



This species was described from the flying squirrel and is not 

 known from any other host. 

 N. antennatus (Osborn). 



Bull. 7, O. S., Div. Ent., U. S. Dept. Agr., 25, 1891. 



This species is easily recognized by the strong backwardly 

 directed spine on the first antennal segment. It occurs on the 

 squirrels of the genus Sciurus, and while not recorded from New 

 England is almost certain to be found on the proper hosts. 



Enderleinellus Fahrenholz. 



Antennae five-segmented, fore and middle legs of equal size. 

 E. suturalis (Osborn). 



Bull. 7, O. S., Div. Ent., U. S. Dept. Agr., 27, 1891. 



This species, recognized by the prominent suture across the head 

 just behind the antennae, occurs on the ground squirrels of the 

 genus Citellus. 



Euhaematopinus Osborn. 



Antennae three-segmented,* the hind legs with broad disk like 

 appendage on femur and tibia. 

 E. abnormis (Osborn). 



Bull. 5, N. S., Div. Ent., U. S. Dept. Agr., 187, 1896. 



The three- jointed* antennae and the peculiar processes on the 

 femur and tibia of the hind legs distinguish this species readily. 

 Moreover, it is known only from the mole Scalops aquaticus or its 

 variety argentatus. 



* Four, one microscopic, according to Ferris. 



