CICADELLINAE: PART 2. NEW WORLD CICADELLIN] 707 
Sibovia improvisula, NEW SPECIES 
FiGURE 573, PAGE 706 
Length of male 6.5 mm. Head with median length of crown seven-tenths 
interocular width and approximately four-tenths transocular width, clypeus 
flattened medially. Other external structural characters as in S. carahua, n. sp. 
(below). Male pygofer not well produced for the genus, chaetotaxy as in 
carahua, with a short ventral anteapical acute process that extends mesad 
almost to median line; plates extending posteriorly almost as far as pygofer 
apex; style not extending posteriorly as far as apex of connective; connective 
with stem much longer than arms; aedeagus broadened in apical half, apex 
obliquely truncate, without shaft processes; paraphyses short, crossed near 
bases. Female unknown. 
Color of anterior dorsum and forewings sordid tan, with a pair of narrow 
black stripes arising one on each side of coronal apex, crossing ocelli and di- 
verging posteriorly, becoming brown on pronotum and continuing through 
basal angles of scutellum and forming a broad commissural longitudinal stripe 
to claval apices, with a broad parallel brown stripe extending from base of 
corium to base of second apical cell; face, thoracic pleura, and legs sordid tan 
except a longitudinal black stripe on propleura bordering dorsopleural carina. 
Holotype male, San Antonio, El Salto, Durango, Mexico, 5,000 ft., June 10, 
ore MeAgEmbury) (UCAL). 
The occurrence of only two longitudinal stripes on the crown and pro- 
notum, the ventral pygofer process, and the crossed paraphyses differentiate 
umprovisula from other species of Sibovia. 
Sibovia picchitula, NEW SPECIES 
FiGuRE 574, PAGE 706 
Length of male 6.0 mm, of female 6.0-6.5 mm. Head with median length of 
crown varying from slightly less than two-thirds to three-fourths interocular 
width, and from slightly less than four-tenths to almost one-half transocular 
width, crown with a slight transverse concavity before ocelli, clypeus convex 
medially. Pronotum with width approximately equal to transocular width of 
head. Other external structural characters as in S. carahua, n. sp. (below). 
Male pygofer moderately produced, apex regularly convex, with a very short 
apical process curving medially, setae as in carahua; plates not extending 
nearly as far posteriorly as pygofer apex, narrowed more abruptly than usual 
in the genus; style extending posteriorly as far as apex of connective, more 
broadly truncate apically than in most other species in the genus; connective 
with stem broader and arms shorter than in most other species of Sibovia; 
aedeagus slender, rounded apically, without processes; paraphyses much as in 
S. occatoria (Say) (fig. 589A). 
Ground color of dorsum including forewings, black, with a median and two 
lateral longitudinal yellowish green stripes on crown, the median one ex- 
tending through pronotum and scutellum and narrowing to form a com- 
missural margin in each clavus to apex of latter, the lateral stripes extending 
