328 THE UNIVERSITY SCIENCE BULLETIN. 



size of the insect. It often commences to sing late in the after- 

 noon and continues off and on until dark." 



The specimens examined by the writer were taken in 

 Georgia. 



Tibicefi dorsata (Say). 



(PI. XX. fia:s. .')-6: pi. xxiv, fig. 8; pi. xxvi, fig. 4; pi. xxvii, fig. 7.) 

 Cicada dorsata Say, .11. Acad. Xat. Soi. Phila., iv, p. 331, 1825; Conipl. Writ., ii, p. 252. 

 Thopha caria Walk.. List Honiop.. i, p. 42, 1850. 

 Fidiciiia riassa "Walk., Ins. Saund., Homop., p. 10, 1858. 

 Cicada dorxnla UIil., Bui. U. S. Geol. Geog. Surv., i. p. 342, 1876. 

 Cicada dor.tain Uhl., Trans. Md. Acad. Sci., i, p. 153, 1892. 

 Cicada dorsata Tuck., Kans. Univ. Sci. Bui., iv, p. 64, 1907. 

 Cicada dorsata Davis, Jl. N. Y. Ent. Soc, xxiii, pp. 161, 164. 1915. 

 Tibiceii dorsata Van D., Cat. Hemip. X. A., p. 495, 1917. 



A large greenish-yellow and black species. Specimens at hand vary in 

 length from 31 to 38 mm. 



Color-: Head mostly black but with yellowish-green spots running 

 along antennal ledges to eyes, each of which spots usually contains a 

 small black spot, and with irregular light spots along posterior margin 

 laterad of the lateral ocelli. Also on the upper part of the front there is 

 a small elliptical light spot. Pronotum yellowish-green, usually with the 

 two attenuated, black, median triangles which enclose a light median line, 

 and usually widen out making the groove cephalad of the collar black. 

 Often only parts of these triangles are present. Sometimes the part 

 back of the eyes is black as is also a very narrow portion of the lateral 

 margins. The mesonotum has the following parts black: Between the 

 arms of the W, a long posteriorly narrowing line on each side laterad of 

 this, and a pair of narrower lines on the lateral margins, also a large 

 triangular spot cephalad of the light cruciform elevation which sends an 

 anterior process cephalad between the^inner arms of the W. The arms of 

 the W apically, the lateral margins and the depressions around the cruci- 

 form elevation, are all heavily pruinose. The abdominal terga are black 

 with a row of dorsal white spots. The first segment has lateral white 

 spots, the third segment often with a narrow pruinose line along the 

 anterior margin, and the rest of the segments pruinose laterally, the last 

 segment often being entirely pruinose. The wings have the veins, with 

 the exception of the usually black base of media, yellowish-brown and be- 

 coming darker apically. The cross veins between R; and R, •. and between 

 the latter and M, are distinctly darkened. The basal areoles of the fore 

 wings are brownish, and the flaps of both wings are grayish, the first ones 

 with an orange tinge. The wings appear strongly vitreous due to the 

 unusual corrugation of the membrane, and are slightly clouded apically. 

 Beneath the insect is testaceous, the opercula lighter, and in fresh speci- 

 mens is entirely pruinose. The legs are of about the same color as the 

 under side, the posterior ones being darkest. They are distinctly striped. 



