216 
Length, 2.5 mm. 
Type and allotype, Makanda, Ill, June 26, 1909. Paratypes, two 
females, Plummers Island, Md., June 10, 1906 (W. L. McAtee), and June 
30, 1907 (A. K. Fisher), and one female, Virginia, near Plummers Island, 
July 20, 1913 (W. D. Appel). 
CORIMELAENA AGRELLA McAtee, sp. n. 
Body as broad across posterior part of abdomen as at humeri, very 
broadly rounded behind; thicker throughout than in C. lateralis. Trans- 
verse depression across middle of pronotum more conspicuous than in 
that species, pronotum more tumid, bulging downward more strongly 
before humeral angle; posterior margin of pronotum rather straight. 
Costa slightly incurved opposite point where claval suture disappears 
beneath scutellum, insect therefore appearing somewhat constricted at 
this level. Triangular area between cubitus, brachium, and claval suture 
much narrower than in C. lateralis and with fewer punctures. Color more 
greenish with brassy reflections. 
Length, 3 to 4 mm. 
To put the contrasts with C. lateralis in another way it may be said 
that that species is broadest at humeri, more narrowly rounded behind, 
not appearing constricted, and by no means as thick. The depression 
across pronotum and the humeral tumidity are less conspicuous. Brachial 
field broader and with more numerous punctures. Length, 3.5 to 4 mm. 
Type, a male from Plummers Island, Md., May 18, 1913, W. L. 
McAtee (in writer’s collection). Allotype, same locality, June 17, 1913, 
W. L. McAtee. 
Other specimens examined: from Plummers Island, Md., April 26, 
1908, May 4, 9, 19138, May 17, 1907, May 24, 1914, June 7, 1914, June 8, 
17, 1913, August 19, 1906; from Maryland near Plummers Island, May 
9, 18, 1913, May 10, 1916, May 23, 1915, May 24, 1914; from Great Falls, 
Va.,-May 19, 1915, W. L. McAtee. 
To the above description, which is by Mr. McAtee, I add the struc- 
tural and color details in the key, and record a male from Kentucky in our 
collection. 
ADDENDA * 
ADDENDUM 1 
THYANTA Stal 
The species of this genus are remarkably alike in structure and with 
few exceptions very similar in color. The key presented herein is based 
upon specimens in our collection and includes all species of the genus 
described from North America except pallidovirens Stal, which may be a 
variety of custator Say. The localities cited in the key are those of the 
specimens in our collection. 
[* In order to leave Mr. Hart’s text as nearly as possible in its original form the 
editor has written the following addenda, hoping that the matter presented may prove 
useful to students of this family.] 
