152 MAINE AGRICULTURAL EXPERIMEXT STATION. I915. 



Eiiipoasca suiaragdiila Fallen. 



Cicada suiaragdiila Fallen. Hemip. Suae. Cicad. p. 53. i8>9. 

 Empoasca smqragdida Gillette. Typhlocybidae U. S. Xat. Mus. Proc. 



Light yellowish green with a distinct smoky or black stripe following 

 the sntural line of the elytra. Length 4 mm. 



This is a common species over a large portion of the United States 

 as well as Europe and in Maine is met with on willows generally. It 

 was taken this season at Orono, on Viburnum July 22, on willow Aug. 

 5th; Portland, Aug. 13th; Highmoor Farm, Aug. 15th; Alt. Katahdin, 

 Aug. 22nd; Houlton, Aug. 24th; Ft. Kent, Aug. 28th. 



While commonly present it has not been noted in excessive numbers 

 and it may be counted as of rather slight economic importance. 



Empoasca atrolabes Gillette. 



Empoasca atrolabes Gillette. Prcc. U. S. Xatl. Aluseum XX, 736. 



Dark green without markings except a distinct black spot at end of 

 clavus, the tarsi blue. Last ventral segment with a deep notch at each 

 side of the hind border leaving a central produced lip as seen from 

 ventral face but, with a slightly different angle, this lip is shortened to 

 have the appearance shown in Gillette's figure. Length 3.75 mm. 



This is a very abundant species on the alder and is sometimes taken 

 on plants adjacent to this bush but the alder must be its favorite food 

 plant if not the exclusive host plant for the growth of the larvae, as 

 specimens have been taken in large numbers from clumps of alder 

 bushes when surrounding bushes showed few or none. 



It occurs all over the state and our records show captures at Orono, 

 Aug. 10, '05, July 30, '13; Xorth Harpswell, Aug. 12th; Grand Lakes 

 Stream, Aug. i6th ; Highmoor Farm, Aug. 15th; Phair, Aug. 26th; 

 Fort Kent, Aug. 26th. 



The economic status of this species depends on the value assigned to 

 its host plant, the alder, which is one of the most common shrubs of 

 the state. Inasmuch as its foliage adds much to the scenic beauty of 

 the state it may be fair to count it as having economic value and its 

 insect pests therefore injurious. 



Empoasca iinicolorf 



This species is interesting as one of the rather rare cases where a 

 leaf hopper has adapted itself to feeding on coniferous trees. The 

 specimens taken so far were all secured from arborvitae or from other 

 conifers where the food plant was noted. 



The insect is about three and one-half millimeters long, of a dark 

 green color with no markings and very well matched in color with 

 the leaves of the plants on which it occurs. 



While not in large numbers it v.^as found distributed on a number of 

 different trees near the station building Aug. 2, and was found on both 

 arbor vitae and white pine Aug. 5th. In present numbers it can not be 



