BRACHYSTETHUS.—PEROMATUS. 85 
1. Brachystethus vicinus. (Tab. VIII. fig. 4.) 
Brachystethus vicinus, Sign. Ann. Soc. Ent. Franc. sér. 2, ix. p. 344. 31; Stal, En. Hem. i. 
p. 48. 3’. . 
Hab. Costa Rica, Caché (Rogers).—CotomBia’, Bogota (coll. Dist.); Brazim?, 
Ega, Amazons (coll. Dist.). 
The specimen figured is a single example received from Costa Rica. 
2. Brachystethus rubro-maculatus, var. (Tab. VIII. fig. 6.) 
Brachystethus rubro-maculatus, Dall. List Hem. i. p. 337. 47; Sign. Ann. Soc. Ent. Fr. sér. 2, 
ix. p. 345.57; Stal, Stett. ent. Zeit. xxiii. p. 118. 116°; En. Hem. ii. p. 48%. 
Brachystethus sex-maculatus, H.-S. Wanz. Ins. ix. p. 310, f. 1010°. 
Hab. Mexico 12345 (Mus. Berol.; Bilimek, Mus. Vind. Ces.; coll. Sallé), Valladolid, 
Yucatan (Gaumer); British Honpuras', Belize, river Sarstoon (Blancaneaux) ; Gua- 
TEMALA, San Gerdénimo, La Tinta and Sabo, Vera Paz (Champion) ; Costa Rica (coll. 
Dist.), Caché (Rogers); Panama (coll. Dist.), Matachin (Schunke, coll. Oberthiir). 
This is a most variable species, both in colour and punctuation. All the specimens are 
more or less of the dull hue and pattern of the variety figured (which came from Yucatan), 
in which the spots of the pronotum and corium become irregularly enlarged and the 
last often confluent, and also possess the extremely coarse punctuation of the scutellum— 
which, compared with typical and normal forms, would raise a presumption that this 
variety had become constant in these characters, and must therefore be raised to specific 
rank. I have, however, seen all the intermediate links, both in colour and punctuation, 
including an undoubted Mexican specimen which has almost this identical Yucatan 
facies, save in brightness of hue. In this species we may see the extreme of varietal 
segregation, without finding any sufficient aggregate of characters to note the existence 
of more than one “ species.” 
PEROMATUS. 
Peromatus, Amyot et Serville, Hist. des Hém. p. 156 (1843) ; Dallas, List Hem. i. p. 316.1 (1851). 
The distinct keel to the metasternum, which is notched or bifid in front, agrees with 
the following genus (Edessa) in at once separating both these genera from any of the 
preceding. Peromatus differs from Edessa in having the antenne of four joints only, 
and is a distinctly Neotropical genus. 
1. Peromatus notatus. (Tab. VIII. fig. 8.) 
Edessa notata, Burm. Handb. ii. 1, p. 854. 11; H.-S. Wanz. Ins. iv. p. 17, f. 363°; vii. p. 126. 
Peromatus notatus, A. & S. Hist. des Hém. p. 156.1°; Dall. List Hem. i. p. 818.1*; Hagl. Stett. 
ent. Zeit. xxix. p. 162. 2'; Stal, En. Hem. ii. p. 48. 1’. 
