DESCRIPTIONS OF GENERA AND SPECIES. 221 



downward ; thus they completely protect the rostrum 

 from above and from the side. The cheek-like pieces 

 are seen through the dorsal part of the hood in con- 

 sequence of the transparency of the latter. When 

 seen from above the hood looks exactly like a minute 

 caput. Dorsal surface hairless. 



Rostrum long and narrow; in life it is usually held 

 perpendicularly. Rostral hairs very long. Legs longish, 

 particularly the first pair ; the fourth pair slightly 

 passes the posterior margin and has a long terminal 

 hair. The other pairs have a nearly straight claw; 

 that of the third leg is very small. The femora and 

 coxae of the third and fourth legs are very much 

 broader than the other joints when seen from the side, 

 but not when seen from below. The tarsi of all the 

 legs are long and thin. The suckers are three pairs 

 almost touching and close to the posterior margin, 

 arranged one pair anteriorly and two posteriorly, or 

 perhaps it would be more exact to say forming a 

 triangle on each side of the body ; the anterior pair is 

 the largest. 



Habitat. Dr. Kramer found the species on trees in 

 Germany, in places where the sap was running from 

 wounds in the bark. I have found it in "Warwickshire 

 in a somewhat similar situation, and also in considerable 

 numbers at Studland in Dorsetshire on an elm tree in 

 the same condition. 



HlSTIOSTOMA PYRIFORME,* n. S. PL V. 



Female. Male. 

 Length (without rostrum) about -30 mm. '25 mm. 



Breadth about 



Length of legs, first pair, about 

 ., ,, second pair, about 



third pair, about 



fourth pair, about 



13 

 15 

 17 



20 



22 



12 

 16 

 16 

 16 

 20 



The breadth of the female is taken midway be- 

 tween the second and third legs ; there it is tolerably 



* Pyrum, a pear; and for ma, form. 



