THRIPID^E. 547 



In Phloea the body is much flattened, and expanded laterally 

 into leaf-like flaps. The antennae are three-jointed, the first 

 joint of which is longest. P. corticata Drury is a peculiar 

 form, which occurs in Brazil. 



Arma spinosa Dallas (Fig. 550, 6 ; a, beak, seen from be- 

 neath ; c, beak of Euschistus punctipes Say) is useful since it 

 preys on the larva of the Doryphora. 

 Another bug of this group, the Stiretrus 

 fimbriatus Say (Fig. 551) has similar 

 habits. 



In Corimelcena the wing-covers are 

 nearly covered by the scutellum, which 

 is wider behind than before. The body 

 is short and transverse, being broader than long, and scale-like 

 or semicircular in shape. Corimeloenn. nitiduloides Wolff re- 

 S'-mbles a Hister beetle, and is greenish black, with dull honey 

 yellow antennae. The species of this genus have much the 

 same form, and are usually shining black. C. pulicaria Ger- 

 mar, according to Kiley, injures straw berry -vines and grape- 

 vines in Illinois. In the genus Teti/ra the scutellum covers 

 nearly the whole abdomen, but leaves the side of the wing- 

 oovers exposed. The antennae are slender; the first joint is 

 longer than the second, the third being the shortest, and the 

 fifth is twice as long as the fourth. Tetyra marmorata Say i-* 

 a variegated species, the costal margin of the 

 wing being provided with transverse fucous lines. 



The genus Scutellera is remarkable for the 

 great size of the scutellum, whence its name is 

 derived. This piece, which is elongated trian- 

 gular, covers not only the entire abdomen, but 

 also the wings ; the antennae are five-jointed, 

 the two first joints small, the three last ones 

 long, quite large. The species are adorned with gay metallic 

 colors, and are especially abundant in the Island of Sunda 

 (Gerstaecker.) No species of Scutellera occur in America. In 

 the group or family ArthropteriddB of Fieber the scutellum is 

 still larger than in Scutellera. 



THRIPIDJE (Thripsides) Fallen. This interesting group 



