1894.] 171 



hoping for further notes from the observer, and for specimens for in- 

 vestigation. 



Another point which seems of interest is the observation of Prof. 

 "Wallace of the Charaeas larvae being found in immense numbers on 

 the land on which the Voles did so much damage a few years ago. 



The coincidences may very likely be of no scientific or practical 

 interest beyond showing partiality of both the Vole and insect pests 

 for the same kind of upland locality, and the same kind of vegetable 

 food, so far as grass is concerned, but the occurence may be just worth 

 mention. 



Agriculturally, these sweeping attacks of CharcBas graminis are of 

 a good deal of importance, as their ravages (bad enough in destroying 

 the pasturage) may extend to such corn land as there may be in the 

 mountainous or upland districts preferred by the infestation, but such 

 measures of treatment as may lessen the evil, as well as descriptions 

 of the imago, and details of the wide European distribution of the 

 species have been given so fully by many entomological writers, that 

 it is unnecessary to enter on them again here. 



Torrington House, St. Albans : 

 July 10th, 1894. 



ON A NEW SPECIES OF PSYLLA. 

 BY W. M. MASKELL. 



Genus Psylla, Low. — Head with arched ridges ; vertex with two 

 posterior shallow perforations. Dorsulum well developed, about as 

 broad in front as behind. Elytra more or less widely rounded, usually 

 broadest near the middle ; the apex is between the subcostal and the 

 cubital veins ; the stalk of the cubitus is shorter than the stalk of the 

 subcosta. Frontal cones divided from the vertex. 



PSTLLA ACACi.a:, gp. n. 

 ? . Length of adult female about yV inch. General colour of the thorax, 

 dorsally, dark brown with very faint, small, narrow, yellowish stripes. Head buff, 

 with brown stripes ; frontal cones black ; eyes yellowish ; anterior ocelli dark orange. 

 Abdomen greenish, with bands of dark brown ; genitalia orange. Antennae and 

 feet light brown, darkening to the tips. Vertex rather flat, covered with a short 

 light coloured pubescence. Eyes prominent, semiglobular. Dorsulum moderately 

 elevated. Frontal cones rather short. Antennae with the first two joints thick and 

 short, the rest long and slender ; the whole antenna is nearly as long as the body. 

 In the fore-wing the costa or marginal vein is stout, and runs all round the margin 

 till it meets the clavus. The primary stalk is nearly one-fourth the length of the 

 whole wing ; at its oxtroinity the stalk of the cubitus is half as long as the stalk of 



