ANISOPS.—CORIXA. 375 
A. pallens agrees with A. crassipes in having the pronotum unimpressed in both sexes, 
but differs from that species in its smaller size, much shorter pronotum, pallid colora- 
tion, and more slender limbs. The colour of the abdomen and metanotum is, as usual, 
visible through the diaphanous elytra. 
PLEA. 
Plea, Leach, Trans. Linn. Soc. xii. p. 14 (1815) ; Fieber, Gen. Hydroc. p. 27, t. 43. 
Ploa, Stephens, Nomencl. Brit. Ins. p. 66 (1829); Fieber, Ent. Mon. p. 16, t. 1. figg. 27-35 ; 
Amyot et Serville, Hist. Nat. Ins. Hémipt. p. 449; Herrich-Schaffer, Wanz. Ins, ix. p. 45, 
t. 295. figg. A-D. 
This peculiar genus includes several very small extremely closely allied species from 
widely separated geographical regions. 
1. Plea striola. (Tab. XXII. fig. 17, var.) 
Ploa striola, Fieb. Kut. Mon. p. 18, t. 2. figg. 1-3". 
Plea striola, Ubler, in Kingsley’s Stand. Nat. Hist. ii. p. 253°; P. Z. S. 1893, p. 706°; 1894, 
p. 224°. 
Hab. Nortn America?, Southern United States ? 4, California.—Mexico+*, Vera Cruz 
(Hoge); Guatemala, Duefias, Paso Antonio (Champion).—ANTILLES, Cuba?4, St. Vin- 
cent °, Grenada 3. 
‘The three or four specimens from each of the Central-American localities quoted 
differ somewhat inter se: those from Vera Cruz are very pale, with distinct rufo- 
fuscous spots on the head, pronotum, and elytra, and have the entire upper surface 
closely punctured; those from Duefias have a dark stripe on the head only and the 
scutellum almost smooth; those from Paso Antonio are very small, almost unicolorous, 
and very coarsely punctured. J. striola is considerably smaller than the Palearctic 
P. minutissima. 
Fam. CORIXIDA. 
CORIXA. 
Coriza, Geoffroy, Hist. abrégée des Ins. i. p. 477 (1764) ; Burmeister, Handb. der Ent. ii. p. 186. 
Corisa, Amyot et Serville, Hist. Nat. Ins. Hémipt. p. 445 (1843) ; Fieber, Gen. Hydroc. p. 28, 
t. 4. fige. C; Sp. Gen. Corisa, p. 13. 
Sigara, Fabricius, Syst. Ent. p. 691 (1775). 
Of this genus we have, unfortunately, very little material, not a single representative 
having been obtained by us from Nicaragua or Panama. Many species must inhabit 
the central plateau of Mexico, where, indeed, one is so exceedingly abundant as to 
be collected and sold in large quantities for the food of cage-birds. Amongst the 
Central-American forms before me, two well-marked groups or subgenera are repre- 
sented, one with and the other without a claw to the anterior tarsi (pala). 
