36 FAMILY I. — SCUTELLERIDjE. 



corium with opaque part greatly narrowed ; connexivum with 

 seven visible dorsal segments ; inner wings with primary and 

 subtended veins rather widely separated and provided with a 

 hamus ; tibiae without distinct spines ; tarsi 3-jointed. 



These curious turtle-shaped bugs appear to be nowhere com- 

 mon in this country. As far as known they are phytophagous 

 in habit and are, for the most part, found on the foliage of 

 shrubs or trees in the vicinity of water. Representatives of 15 

 genera occur in the United States. Of these eleven, comprising 

 15 species, are known from the territory covered by this work. 

 The principal literature pertaining to our species may be found 

 in the following works : Germar, 1839 ; Dallas, 1851 ; Stal, 1867, 

 1870, 1872; Schouteden, 1904; Van Duzee, 1904; Hart, 1919; 

 Stoner, 1920. 



KEY TO EASTERN GENERA OF SCUTELLERID^E. 



a. Scutellum broadly oval, covering at least the apical third of costal 

 border of elytra; abdomen (except in Phimodera) with a finely 

 striated stridulatory area each side of middle of fourth and fifth 

 ventrals (Subfamily Tetyrinas). 

 b. Pronotum without a transverse submedian groove; head gradually 

 declivent. 

 c. Second joint of antennae as long as or longer than third ; length 

 7 or more mm. 

 d. Osteolar opening not continued as a canal towards the side mar- 

 gin of the metasternal plate. 

 e. Costal border of elytra exposed to or beyond middle of scutellum. 

 /. Head longer than broad, rounded in front; abdomen usually 

 with a broad shallow median groove; length 12 or more mm. 



I. Tetyra, p. 37. 



ff. Head smaller, triangular, pointed in front, its sides nearly 

 equilateral; abdomen without a median groove; length not 

 over 10 mm. II. Diolcus, p. 39. 



ee. Costal border of elytra covered by scutellum except at base; 

 length 11 or more mm. III. Chelysoma, p. 41. 



dd. Osteolar opening extended outwardly or towards the sides by a 

 distinct canal. 

 g. Osteolar canal long, its apical portion much widened, bent for- 

 ward and punctured (fig. 8, a) ; costal border of elytra exposed 

 not farther than middle of scutellum ; head as long as broad. 



IV. Sphyrocoris, p. 42. 



gg. Osteolar canal shorter, nearly straight, not widened apically; 

 costal border of elytra exposed to or beyond apical third of 

 scutellum; head broader across the eyes than long. 



