Corixide. S31 
in Corixa, called by Sahlberg the parapleura. Segments 
of abdomen asymmetrical in the ¢, symmetrical in the 
?; male with a “strigil” on the upper side of the sixth 
segment (see Introd. p. 10) in most of the species. There 
are two genera in the family, easily distinguished by the 
presence or absence of the scutellum. 
(2) 1. Larger: scutellum wanting . ‘ . Corrxa. 
(1) 2. Very small: scutellum present < . Sieara. 
CORIXA, Geoff’. 
To the above characters of the family need only be added, 
that the scutellum in this genus is wanting, that the base 
of the pronotum is angulated in the centre (except in 
coleoptrata), and that the antennee are four-jointed, the 
fourth joint thin, filiform, the third longer than the first 
and second, and somewhat swollen. We have twenty 
species of this genus, of the fifty-five recorded as 
Palearctic by Dr. Puton; they have been divided into four 
subgenera, as shown in the table of species. 
(46) 1. Pronotum with pale transverse lines. 
(5) 2. Large species, pronotum and elytra not 
rastrate, asymmetry to left in the 
male. (Subg. Macrocorisa, Thoms.) 
(4) 38. Larger, pronotum with sixteen or more 
pale lines. . GEOFFROYI. 
(3) 4, Smaller, pronotum with 12-14 lines . ATOMARIA. 
(2) 5. Smaller species, pronotum and elytra 
more or less rastrate, asymmetry to 
right in the male. 
(43) 6. Pronotal dorsal carina when present only 
visible near the anterior margin. 
(34) 7. Basal joint of posterior tarsi pale at the 
apex. Male with a strigil. (Subg. 
Coriva, Geoff.) 
(11) ‘8. Corium not rastrate. 
(10) 9. Pronotum dark with pale lines, the dark 
lines as broad as the pale . . LUGUBRIS. 
(9) 10. Pronotum pale with narrower dark lines. HIEROGLYPHICA. 
(8) 11. Corium rastrate. 
(21) 12. Larger species, 7-8 mm. 
(16) 13. Clavus and corium very rastrate, dull, 
transverse pale lines very narrow, 
nearly entire. 
