108 
PRELIMINARY LIST 
Empoasca anreo-viridis Uhl. 
In large numbers at Denver and in Clear Creek Canon, on willows, August 
7th to lsth (Uhler. 5). Colorado (VanDuzee, 4). 
Empoasca clypeata n. sp. 
Male: Clypeus one-half longer than broad, basal suture straight: lorae as in T. 
sanguinna; genae very narrow, attaining the clypeus as a very narrow line, lateral 
margins nearly stra'ght; front nearly twice as long as its greatest width between the 
eyes, twice the length of the clypeus, superior angle very broad and obtusely rounded. 
Face and vertex finely sbagreened. Disc of 
vertex flat, sloping, scarcely longer on the 
middle than next the eye. Pronotum slightly 
wrinkled on posterior two-thirds, glabrous in 
front, slightly more than twice as broad as long, 
anterior margin broadly rounded, posterior 
margin concave, posterior angles sharply 
rounded, sides long. Scutellum normal, trans¬ 
verse suture straight. Color yellowish; in light 
specimens, face, vertex, pronotum, and scutellum yellowish, concolorous; in dark speci¬ 
mens front with a median white line, pronotum dusky on posterior half, scutellum with 
basal angles and transverse groove dark; elytra in light specimens yellowish subhyaline, 
in dark specimens shaded into deep smoky subhyaline; venter and legs entirely pale 
yellow, sometimes tibiae and tarsi slightly smoky. 
Length 4.5 mm. Described from six males. 
Estes Park, July 10th (Gillette). Steamboat Springs, July 
10th on willow (Baker) 
JEmpoasca nigra n. sp. 
Male: Clypeus about one-half longer than broad, basal suture straight: lorae as in 
T. sanguinea: genae suddenly broadening close to eye, lateral margin almost straight, 
attaining the clypeus in a very narrow line; front nearly one-half longer than broad, 
once and two-thirds the length of clypeus, superior angle 
broadly obtusely rounded. Face coarsely and obsoletely 
sbagreened. Disc of vertex sloping, with a slight median 
depression on the posterior half opening into a slight de¬ 
pression on the anterior margin of the pronotum, length 
at the middle slightly more than next the eyes. Prono¬ 
tum opaque, on anterior third smooth, on posterior two-thirds indistinctly transveisely 
rugose; slightly less than twice.as broad as long, anterior margin broadly rounded, 
posterior margin somewhat concave, posterior angles sharply rounded. Scutellum 
opaque, with a median pit just in front of the transverse groove, posterior half irregularly 
wrinkled. Color black; antennae whitish; ocelli surrounded by a narrow pale margin; 
elytra black, posterior third fading into smoky subhyaline; anterior tibiae, and all the 
tarsi, smoky. 
Length 2.75 to 3 mm. Described from five males. 
Mountains south-west of North Park, July 10th, on Arte¬ 
misia tridentata (Baker). 
Empoasca nigroscuta n. sp. 
Female: Clypeus minutely transversely rugose, one- 
half longer than wide, basal suture straight, apex rather 
pointed; lorae two-thirds as long, and one-halfas wide as 
clypeus, distant from tip of clypeus; genae narrow, a deep 
sunken furrow beneath the eyes extending to the lorae, 
not attaining tip of clypeus, outer margin nearly straight, 
very narrow below lorae; front smooth, nearly twice longer 
