60 Mr. James Edwards’ Synopsis of 
facies, but may readily be distinguished by the characters 
of the genitalia. A valuable notice of these insects, 
with figures of details, will be found in the ‘ Cicadina 
agri Ligustici’ of Dr. P. M. Ferrari, p. 60, et seq. 
(Jassus). 
TABLE OF SPECIES. 
1 (2). J; genital plates a little shorter than the valve. 
¢; last ventral segment somewhat shorter 
than the preceding Sc ar 5c Oe 
2 (1). gf; genital plates much longer than the valve. 
9; last ventral segment much longer than 
the preceding. 
3 (4). Crown with an oblique dark line running in- 
wards from the front margin of eacheye .. 2. modestus. 
4 (3). Crown without any oblique darkline .. .. 3. miaxtus. 
1. commutatus. 
1. Allygus commutatus, Fieb. 
Allygus commutatus, Fieb., Kat. der Kur. Cicad. (1872), 
p- 18; Scott, Ent. Mo. Mag., xii., 171, 2. 
Jassus atomarius, Flor, Rhyn. Liv., u., 326, 5; 
Kirschb., Cicad., 883, 2; Thoms., Opusc. Ent., 1., 
47, 3. 
J. commutatus, Ferrari, Cicad. agri Ligust., 60, 3, and 
fig., p. 63. 
Thamnotettia reticulata, J. Sahl., Not. Fenn., xii., 
210, 2. 
g. Genital valve as long as the preceding segment, rounded- 
triangular; plates shorter than the valve, separately rounded- 
triangular, and leaving uncovered a piece of the apices of the 
styles about equal in length to the genital valve; the styles, when 
viewed from below, appear as two narrow horn-like processes con- 
verging at the apex; their real form, which is determinable when 
viewed from the side is that of a recumbent letter Y, having the 
upper arm the longer. 92; last ventral segment a little shorter 
than the preceding, its hind margin nearly even, with a very 
feeble arcuate notch in the middle; the lateral angles rounded. 
Length, 6} mm. 
Rare. Tintern (7. V. Wollaston) ; Norwich, August, 
1887, one female beaten out of an elm fence. 
