46 HEMIPTERA-HOMOPTERA. 
vertex very short and not produced conically. In the ‘ Bidrag til Rio Janeiro-Traktens 
Hemipter-Fauna’ [part ii. p. 69 (1858) ], Stal introduces his other genera as belonging 
to the family—Thiscia, which has the head conically produced, and Philatis, which is 
distinguished by the absence of wings.. The latter genus is closely allied to the Isside, 
and its type is given as Mycterodus productus, Stal,—Mycterodus having been described 
by Spinola as a genus of his family Issites. Stal, however, appears latterly to have 
dropped the genus Thiscia, as in his “ Hemiptera Mexicana” (Stett. ent. Zeit. xxv. 
p. 56) he describes two species with conically-produced heads under the name Acanonia, 
which is the abbreviated form of Spinola’s name adopted by Amyot and Serville (Hist. 
Nat. des Ins. Hémipt. p. 520). 
_  ACANALONTA. 
Acandlonia, Spinola, Ann. Soc. Ent. Fr. viii. p. 447 (1839). 
Acanonia, Amyot et Serville, Hist. Nat. des Ins. Hémipt. p. 520. 
The delicate raised venation of the tegmina, which is more or less reticulate and is 
continued to the margins, is very characteristic of this genus, which includes a large 
number of species. | 
The genus may be roughly divided as follows :— 
I. Head conical, distinctly pointed, about as long as or 
distinctly longer than broad. . . . . . . Subgen. Taiscra, Stal (ex parte). 
II. Head truncate or obtusely and slightly produced, 
distinctly broader than long. . . . . . . . . Subgen. AcANAzontA, Spin. (i. sp.). .. 
As, however, there are one or two somewhat transitional species, the subdivision is 
not quite satisfactory in all cases. 
I. Head conical, distinctly produced. 
1. Acanalonia producta. 
Acanonia producta, Stal, Stett. ent. Zeit. xxv. p. 56°. 
Hab. Mexico (coll. Signoret, in Mus. Vind. Ces.), Jalisco (Schumann). 
2. Acanalonia decens. 
Acanonia decens, Stal, Stett. ent. Zeit. xxv. p. 56°. 
Hab. Mexico (coll. Signoret1, in Mus. Vind. Ces.), Amula in Guerrero 6000 feet 
(H. H. Smith); Guaremata, Senahu in Vera Paz (Champion). 
8. Acanalonia dubia, sp.n. (Tab. VII. figg. 1, 1a.) 
Lete virescens; capite producto, acuto, pronoto longiori, antice saltem carinato; tegminibus amplis, ante 
medium latissimis, inde marginibus extra et intra fere parallelis vel subparallelis, apice late sat truncato ; 
alis lacteis, venis virescentibus ; corpore albido ; pedibus virescentibus. 
Of a bright green colour ; head produced, very slightly reflexed at the tip, carinate at least in front, and with 
