318 THE UNIVERSITY SCIENCE BULLETIN. 



Tibicen pruinosa (Say). 



(PI. xviii, figs. 3-4; pi. xxiv, fig. 3; pi. xxvi, fig. 10; pi. xxvii, fig. 10.) 

 Cicada pndnosa Say, Jl. Acad. Nat. Sci. Phila., iv, p. 330, 1825; Compl. Writ., ii, p. 

 251. 



Cicada pruinosa Harris, Rept. Ins. Mass., p. 176, 1841. 



Cicada bruneosa Wild, Ann. Soc. Ent. Fr., ser. 2, x, Bui., p. xviii, 1852. 



Cicada pruinosa Harris, Treat. Ins. Inj. Veg., edn. 3, p. 218, 1862. 



Cicada canicularis Prov., Pet. Paune Ent. Can., iii, p. 211, 1889. 



Cicada pruinosa Davis & .Tout., Ent. News, xvii, p. 237, 1906. 



Cicada pruinosa Sm. & Grsb., Ent. News, xviii, p. 123, 1907. 



Tibicen pruinosa Van D., Cat. Hemip. N. A., p. 490, 1917. 



Tibicen pruinosa Davis, -Jl. N. Y. Ent. Soc, xxvi, p. 145, 1918. 



A green and black species of fairly large size. Specimens at hand 

 measure from 29 to 33 mm. 



Color: Head black, with the following marked with green or brownish- 

 green: The antennal ledges and the space between them and the eyes, 

 a median elliptical spot on upper portion of front, sometimes three spots 

 at base of the front, and the posterior margin between the ocelli and the 

 compound eyes. Pronotum green or brownish-green except for two large 

 black median spots which taper caudad, uniting just before the collar, 

 and enclosing an elongate greenish spot. Frequently some of the grooves, 

 parts of the lateral margins, and the portions just behind the eyes, are 

 tinged with black. Mesonotum green, marked with black as follows: 

 The spaces between the arms of the W, a spot on each side laterad of 

 the arms which are joined sometimes by a slender line with a spot on 

 the posterior margin, laterad of these a third pair of spots which may 

 join the second pair posteriorly, and with a large spot between the W 

 and the light cruciform elevation, its apex reaching up between the inner 

 arms of the former. Abdominal terga entirely black, first segment with 

 large lateral pruinose spots which sometimes reach over to the second 

 segment, the third segment sometimes with attenuated lateral stripes, the 

 eighth segment and the seventh of the female also pruinose laterally. 

 Wings with veins greenish basally, except the base of media, becoming 

 brown on apical half, and with the cross veins between R3 and R4+5 and 

 between the latter vein and Mi distinctly darkened. Basal areoles of 

 the fore wings greenish but without distinct dash; flaps of fore wings 

 grayish, those of hind wings gray, becoming white posteriorly. Beneath 

 more or less strongly pruinose except for shining black median portion 

 of the abdomen. Legs light, darkening towards the tips of the tibiae. 



Form : The following are the measurements in millimeters of the 

 specimens at hand : 



Length of body 25 to 29 



Width of head 12 to 13.5 



Expanse of fore wings 9G to 100 



Greatest width of fore wing 13.5 to 15 



Greatest width of operculum 7 to 7.5 



Greatest length of operculum 9.25 to 9.75 



Opercula, excluding the extension beyond the coxal cavity, about as 

 long as broad, overlapping medially, and rounded apically but with inner 

 apical margin straighter and longer than the outer. 



