184 
ber 8, 15, 29, 30; and November 17. Nymphs occurred June 6 to October 
30. In the late fall most adults are a dark brownish carmine resembling 
that of the ripe fruit of the Opuntia on which they occur. A few green 
individuals still remain, and it would seem that the red color is assumed 
at transformation, while mature adults are not affected. This dark 
variety was found abundant October 29, 30, and 31, and November 17. 
The species is common in sandy situations east to the Atlantic coast and 
in Iowa and Canada. It hibernates as an adult under shelter (Vestal). 
[The claspers of the male hypopygia of uwhleri, sayi Stal, congrua 
Uhler, and a species provisionally named ligata Say in our collection are 
very similar in structure, the most striking differences being found in 
those of the first two species as Shown in Figures 29 and 30, Plate 
XVII] 
6. RuytipoLtomia Stal 
RHYTIDOLOMIA BELFRAGII Stal 
Rhytidolomia belfragii Stal, Enum. Hemip., Pt. 2, p. 38. 1872. 
Three specimens from northern Illinois in April (S. H. Peabody) ; 
Ill., lowa, Neb., Canada (V. D.). 
[Judging from the general habitus and hypopygial structure of this 
and the preceding species one might reasonably question the validity of 
the generic separation of the insects. The hypopygial claspers are very 
similar to those of Chlorochroa and are shown in Figure 31, Plate 
XVIII.] 
7. THyAnta Stal * 
Key TO SPECIES 
Pronotal side margin anteriorly uneven and serrulate, usually a distinct black 
margin, a very distinct pair of black dots on pronotal disc, behind head; 
punctuation of dise of corium sparser than in the next species; male genital 
segment with median lobe rounded or subangulate.................. calceata. 
Pronotal side margin nearly entire, often dark-mlargined, disc without distinct 
pair of black dots; punctuation of disc of corium quite dense; male genital 
segment with median lobe nearly straight-edged.................++. custator. 
THYANTA CALCEATA Say 
Pentatoma calceata Say; Descrip. n. sp. Heter. Hemip. N. A., 1831; Compl. 
Writ. Ent. N. A. Vol. 1, p. 320. 
Mr. H. G. Barber has recently pointed out ~ the characters for the 
recognition of this species, which had been previously confused with 
custator. He states that calceata appears to be confined to the region east 
of the Alleghanies ; but the species had already been recognized by Dr. S. 
A. Forbes as distinct in our collection. The localities are Urbana and 
Towanda (C. Ill.) and Tamaroa [and Alto Pass] (S. Ill.), and the dates 
are May 2, [8], and 18, and September 22. We have also specimens from 
Kentucky and Florida in the Bolter Collection. 
* For synopsis of North American species see Addenda to this paper. 
7 Journ. N. Y. Ent. Soe., Vol. 19, p. 108. 
