No. 34-] HEMIPTERA OF CONNECTICUT: CYDNIDAE. 777 



Key to Subfamilies. 



Scutellum large and convex, covering the greater part of the abdo- 

 men and wings ; corium usually acute at apex, not reaching apex 

 of scutellum Thyreocorinae 



Scutellum smaller, flat and triangular, not reaching broad apex of 

 corium Cydninae 



Subfamily Thyreocorinae. 



Small, usually black species, generally shining and sometimes 

 inconspicuously marked with w^hite or yellow. The large scutellum 

 is shaped much as in the Scutelleridae and covers the hemielytra 

 except the costal margin, which alone is strongly chitinized. The 

 bugs belonging to this group are most often met with on plants, 

 but are sometimes found under stones and in the excreta of 

 mammals. 



The species formerly placed in Thyreocoris Schrank undoubtedly 

 form several grotips of generic rank, and the forms occurring in 

 our fauna may be placed according to the following synopsis. 



Key to Genera. 



Hemielytra with a groove near the costal margin ; femora with 

 spines Galgupha 



Hemielytra without costal groove ; femora with a few fine bristles 



Corimelaena 



Galgupha Amyot and Serville. 



Black species having spined femora, hind tibiae with five series 

 of spines and a longitudinal carina, and the margins of the body 

 without setae. 



Key to Species. 



Pronotum and scutellum (as viewed from the side) together evenly 

 convex, their bases at same level; hemielytra without a distinct 

 ridge inside costal groove atra 



Pronotum and scutellum together not evenly convex, their bases 

 meeting in a transverse groove : hemielytra with a distinct ridge^ 

 inside costal groove nitiduloides 



G. atra (Amyot and Serville). (PI. xviii, 2.) 



Hemip., 68, 1843. 



Black, shining, antennae more or less reddish. Dorsal surface 

 highly polished, with fine punctation becoming obsolete toward the 

 middle. Form regularly oval. Length 4.8-6 mm. Often taken 

 in sweeping vegetation. 



New Haven, 16 Aug., 1904, 19 July, 1905 (B. H. W.) ; Guilford, 6 June, 



1905 (W. E. B.) ; Westville, 9 Aug., 1906 (B. H. W.) ; Milldale, 21 May, 



1906 (B. H. W.) ; Brookfield, 27 July, 1910 (E. L. D.) ; Southington, 9 

 June, 1910 (B. H. W.) ; Lyme, 14 May, 1911 (A. B. C.) ; Hamden, 23 

 May, 1919 (M. P. Z.). 



G. nitiduloides (Wolff). 

 Icon. Cimic, iii, 98, 1802. 



