108 IOWA STUDIES IN NATURAL HISTORY 
Massachusetts, Connecticut, Ohio, Illinois, Georgia and Montreal, 
Canada. I have one specimen from Virginia. 
Acrosternum hilare (Say) (Puate VII, Figure 2) 
1831. Pentatoma hilaris Say, Descr. Het. Hem., 5. 
1832. Pentatoma hilaris Say, Ins. Louis., 9. 
1851. Rhaphigaster Sarpinus Dallas, List Hem., I, 276. 
1859. Pentatoma hilaris Say, Compl. Writ., I, 304 and 316. 
1868. Rhaphigaster hilaris Walker, Cat. Het., III, 566. 
1872. WNezara hilaris Stal, Svensk. Vet. Handl., 10, no. 4, 42. 
1878. Nezara hilaris Uhler, Proc. Bost. Soc. Nat. Hist., XIX, 380. 
1904. Nezara hilaris Van Duzee, Trans. Am. Ent. Soc., XXX, 58. 
1916. Acrosternum hilaris Van Duzee, Ck. List. Hem. Am. N. Mex., 8. 
1917. Nezara hilaris Whitmarsh, Ohio Agr. Exp. Sta. Bull., 310, 517-552, 15 figs. 
General form elongate oval. Color clear green, somewhat shining, rather 
closely and uniformly punctured. Margins of head, pronotum and abdo- 
men yellowish white. Head uniformly punctate, the extreme edges black- 
ish; tylus and juga equal in length or the tylus slightly exceeding juga. 
Ocelli red. Eyes fuscous. Antennae with second and third segments about 
equal but the third a little the longer; narrow apex of third segment and 
a wider apical portion of succeeding segments rufous or black, whitish at 
bases, the apical segment lighter at extreme apex. Rostrum attaining 
posterior coxae, pale green with black median line and apical portion of 
last segment. Pronotum somewhat deflexed anteriorly, the antero-lateral 
margins straight, the posterior angles rounded, not prominent. Scutellum 
long, broad, the apical portion distinctly narrowed, the basal margin with 
five usually distinct small yellowish calloused spots. Hemelytra a little 
narrower than abdomen, thus exposing the fulvous connexivum which is 
black at the incisures; costal margin of corium a little pale near base; 
membrane white with elongate dusky markings on some of the nervures 
near base. Venter pale whitish green, sparsely, regularly punctate at 
sides but the disk which is more or less distinctly carinate is smooth; 
stigmata yellowish; margins of venter pale yellowish with a black point at 
the posterior edge of each segment. Apex of genital segment of male 
trisinuate and with the outer apical angles acute. Ventral plates of 
thorax coarsely, irregularly punctured, the prostethus more densely and 
regularly punctate than the other plates. Ostiolar opening continued into 
a long, gradually disappearing sulcus. Legs green, scantily furnished 
with brownish hairs, the narrow apices of tarsal segments and tibiae in- 
fuscate; apical half of tarsal claws infuscate, base pale greenish yellow. 
Length, 13.0-19.0 mm. Width across pronotum, 7.5-10.0 mm. 
This is our largest and usually our most common green penta- 
tomid. It may be readily separated from its rare congener in 
our fauna by the characters given in the preceding key, and it 
may be separated from any other of our entirely green penta- 
tomids by its size and its shiny green appearance. This bug 
enjoys a wide distribution, being found in Canada, Cuba, Pan- 
