Subfamily 2. 
Pentatominae. 
St&! 1872 Svensk. Vet. Handl. 10. no. 4. pp. 12—65. (Enumeration of American forms). 
Stal 1876 op. cit. 14. no. 4. pp. 28—115. (Enumeration of Palaeogeic forms). 
Dallas 1851 List 181—350; (with tables). 
Sial 1865 Hem. Afr. I. 76—219; (table on pp. 76—82 of 48 genera). 
Stal 1867 O. V. A. F. XXIV. 501—32; itables). 
Stal 1872 op. cit. XXXII. 33—39; (table of European genera). 
The Pentatominae (as here taken) are cosmopolitan. They are somewhat 
heterogeneous, but can scarcely be divided by more than tribal characters. 
1 
Ten tribes are temporarily employed: 
Pentatomini; with the scutellum extended far beyond the frena, and trisegmentate 
tarsi. In Compastes, the tarsi are bisegmentate. The scutellum is generally 
bo 
co 
6 
7 
mediocre, but in Hoplistodera, Alcimocoris, Aeschrocoris and still more in Hysarcoris 
and Sepontia, it is very large, reaching the apex of the abdomen in the last-named. 
Edessini; with the metasternum greatly elevated, elongately produced before the 
middle coxae, bilobed anteriorly. 
Acanthosomini; differing from some Pentatomini, (in external characters at least), 
by the tarsi beg bisegmentate, by the scutellum generally extending but little 
beyond the frena, and by the 7th abdominal sternite in the female generally 
somewhat strongly sinuate medially in front of the genital valves. 
Aeptini; antenniferous tubercles remote from the margins of the head, first seg- 
ment of antennae not reaching the apex of the head; bucculae rounded anteriorly ; 
first segment of labium extending posteriorly as far as the bucculae or beyond, 
peu longer than the two apical segments together; sterna sulcate; ostioles sub- 
auriculate. 
Halyini; head elongate; labium extending beyond the hind coxae, third segment 
much longer than the fourth; eyes prominent; antennae far distant from the eyes; 
abdomen ventrally sulcate. 
Diemeniini; abdomen beneath anterolaterally with a transversely strigose or rugose 
stridulatory vitta. 
Myrocheini; diagnosed in detail by Stal 1876 Svensk. Vet. Handl. 14. no. 4. p. 52. 
8 Sciocorini; cf. Stal 1. c. p. 49. 
9 Discocephalini; I do not possess any examples of this exclusively tropical and sub- 
tropical American tribe; the only author who has diagnosed it, (and then as a sub- 
family), is Fieber. The characters he gives do not seem sharply limited and may 
be due, in part at least, to the dilatation of the head. 
10 Graphosomini; principally characterized by the absent or very short frena, but 
this does not appear restrictive. The large scutellum is no more a character for 
subfamily separation than it is in Eysarcoris or Discocera. 
The approximate distribution of these ten tribes is shown below. 
