SCUTELLEROIDEA OF IOWA 107 
Color generally (in the North American forms, always) green. Head 
flattened above, rounded in front. First antennal segment not extending 
beyond anterior border of head. Pronotum somewhat deflexed on anterior 
haif. Scutellum and pronotum concolorous, clear green. Base of abdomen 
armed with a short spine. Venter more or less carinate aiong median 
line. Metasternum siightly elevated. Ostiolar orifices continued into a 
long, gradually narrowing ridge which reaches nearly to antero-lateral 
angles of metapleurae. Tuibiae sulcate. 
Key to the species 
Form short, oval; head short, cheeks exceeding tylus; sides of 
pronotum strongly arcuated; margins of abdomen concolorous 
with black points at the incisures; rostrum scarcely reaching 
TUITE EDSEES 25.2 AGA 6 open ee ai aga a a pennsylvanicum 
Form more elongate; head longer; tylus and cheeks equal in 
length; margins of abdomen fulvous with black points at in- 
cisures: rostrum attaining midcoxae ..............0..5. hilare 
Acrosternum pennsylvanicum (De Geer) (Puate VII, Figure 
1) 
1773. Cimex viridis pensylvanicus De Geer, Mem., III, 330, Pl. 34, fig. 5. 
1805. Pentatoma pensylvanica Pal. Beauv., Ins. Afr. Amér., 186, Hém., Pl. 11, 
fie 5: 
1831. Pentatoma abrupta Say, Descr. Het. Hem., 6. 
1851. Rhaphigaster Parnisus Dallas, List Hem., I, 279. 
1859. Pentatoma abrupta Say, Compl. Writ., I, 317. 
1872. Nezara pennsylvanica Stal, Svensk. Vet. Handl., 10, no. 4, 42. 
1878. Rhaphigaster pennsylvanicus Uhler, Proc. Bost. Soe. Nat. Hist., XIX, 380. 
1892. Nezara pennsylvanica Osborn, Proce. Ia. A’cad. Sci., I, Pt. II, 121. 
1904. Nezara pennsylvanica Van Duzee, Trans. Am. Ent. Soc., XXX, 58. 
This apparently rare and locally distributed species resembles 
the following common lowa representative of the genus, A. 
hilare, to a considerable degree and in order to avoid repetition, 
only the principal differential characters will be set forth here. 
Acrosternum pennsylvanicum has a distinctly shorter and more broadly 
oval form than has A. hilare, but the uniform shining green color is com: 
mon to both. In the present form the head is short and broad and the 
juga slightly exceed the tylus, thus leaving the apex of the head markedly 
incised; the rostrum is much shorter, scarcely reaching the midcoxae. 
The sides of the pronotum are strongly arcuated and are not so distinctly 
pale as in A. hilare. The margins of the abdomen are concolorous and 
have black points at the incisures. Length, 14.0 mm. Width across pro- 
notum, 10.0 mm. 
Osborn (1. c.), listed this form from Iowa without comment; 
further data on Iowa material are lacking. In addition to the 
Iowa record the species is reported for New York, New Jersey, 
