Cimicide. 207 
There is only one species in the genus. 
X. ater, Duf.—Black, shining, glabrous, antenne with 
the second joint pale except at the apex ; pronotum shaped 
as above, with a slightly impressed dorsal line; elytra 
sometimes more or less piceous, membrane white at the 
base ; tibize testaceous. 
L. 2 mm. 
Under bark. Reigate, Chobham, Birmingham, Salford 
Priors, Blatch ; Norfolk, Edwards ; Sittingbourne, Cater- 
ham, Richmond, Champion. 
MICROPHYSINA. 
Second joint of antenne distinctly longer than the 
fourth, rostrum reaching beyond the anterior 
cox : : . . : ; : : . Murcropuysa. 
Second joint of antennz not longer than the fourth, 
rostrum not reaching beyond the anterior coxe . Myrmeposia. 
MICROPHYSA, Westw. 
Males and females dissimilar, ¢ with the elytra fully 
developed and shaped as in the Anthocorina, 9 with 
the elytra shortened or not fully developed, and the 
abdomen widely dilated and convex; face much produced 
in front, first joint of the antenng not reaching beyond 
the apex of the head, second joint longer than the fourth ; 
ocelli large and well defined in the @, less definite in the 9; 
pronotum trapezoidal in the gd, and in both sexes with a 
distinct apical ring not hidden at the sides by the anterior 
expansion of the lateral margin, dise with a deep transverse 
impression; scutellum in the ¢ impressed posteriorly ; 
elytra in the male fully developed ; embolium well defined, 
in the 2 abbreviated and in one piece; abdomen in the 9 
very wide and convex, partially or entirely exposed above ; 
legs simple. 
There are six Palearctic species of this genus, of which 
two occur in this country. 
