292 HEMIPTERA-HETEROPTERA. 
1, Sinea undulata. (Tab. XVIII. figg. 5, 5a, 2.) 
Sinea multispinosa, Stal, Stett. ent. Zeit. 1862, p. 443 (nec De Geer) *. 
Sinea diadema (Fabr.), Stal, Enum. Hemipt. ii. p. 70 (part.) ’. 
Sinea undulata, Uhler, Proc. Calif. Acad. Sci. (2) iv. p. 282°., 
Hab. Norta America, Southern and Lower California ?.—Mexico!? (Mus. Vind. 
Ces.), Acapulco, La Venta, Dos Arroyos, Chilpancingo, Venta de Peregrino, Tepetlapa, 
Amula, Cuernavaca, Atoyac, Vera Cruz, Teapa (H. H. Smith), Temax in N. Yucatan 
(Gaumer); GuateMaLa, Champerico, San Gerénimo, Zapote, Guatemala city (Champion) ; 
Costa Rica, Caché (Rogers). 
Var, The spines on the head shorter, and those on the anterior lobe of the pronotum reduced to conical 
tubercles, the neck simply granulate. (3 2.) 
Hab. Mexico, Mazatlan and Presidio (Forrer). 
Prof. Uhler has been kind enough to send me males and females of S. diadema (Fabr.) 
and S. undulata: the males I am unable to separate specifically; but the females 
differ in the amount of sinuation of the sides of the abdomen, S. diadema having the 
fourth and fifth segments strongly and subangularly dilated in this sex and S. undulata 
having the same segments almost arcuately dilated. The common Central-American 
representative of this group agrees with the latter in this respect, and I therefore 
adopt the name of S. undulata for it. Stal! noticed certain differences between the 
Mexican and North-American examples. The specimens before me (including a long 
series from Yucatan) vary greatly in size and colour, most of them being testaceous, 
and the pair of 8. undulata from California are larger than any of those from within 
our limits. The present species is easily recognizable from all the other Central- 
American members of the genus, S. coronata excepted, by the distinctly bigibbous 
posterior lobe of the pronotum. About 100 examples have been examined, nine only 
of which belong to the variety, the latter being connected with the others by inter- 
mediate forms. The Mexican specimen in the Vienna Museum, from the Signoret 
collection, is labelled S. indegra, Stal. A female from Yucatan is figured. 
2, Sinea coronata. (Tab. XVIIL. figg. 6, 6a, 3; 7, 2.) 
Sinea coronata, Stal, Stett. ent. Zeit. 1862, p. 444(9)1; Enum. Hemipt. ii. p-. 71°. 
Hab. Mexico! (Mus. Vind. Ces.; Mus. Holm.?), San Lorenzo near Cordova 
(MZ. Trujillo), Teapa in Tabasco (H. H. Smith), Valladolid in Yucatan (Gaumer) ; 
GuatemaLa, San Gerénimo (Champion: 3 2). 
We possess one male and five females of this species. The abdomen of the male is 
narrow and subparallel to the apex of the fourth segment; the fifth and sixth segments 
are conjointly and angularly dilated, the sixth being produced posteriorly and truncate 
at the apex; the connexival margins are minutely denticulate; and the terminal 
genital segment has a broad, upwardly curved, spoon-shaped process at the tip. The 
abdomen of the female is broadly dilated beyond the middle, with the fifth segment 
