foo N. C. AGR. EXP. STA. BUL. 239 
I am pleased to name this species in honor of Dr. M. W. Nielson who has 
contributed greatly to our knowledge of Cicadellidae. 
S. nwelsoni is closely related to S. occatoria (Say) with which it has been con- 
fused by some earlier workers. It may be distinguished from occatoria by its 
shorter pygofer, shorter paraphyses and shorter connective. S. nielsoni is one of 
the commonest species in Central America. 
Sibovia occaminis, NEW SPECIES 
FicuRE 590, PAGE 721 
Length of male 6.0-6.4 mm, of female 6.4 mm. Head with median length of 
crown from two-thirds to three-fourths interocular width and from four-tenths 
to almost one-half transocular width. Other external structural characters as 
in S. carahua, n. sp. Male pygofer well produced for genus, with apex curved 
mesad and almost attaining median line, chaetotaxy as in carahua; plates not 
extending posteriorly nearly as far as apex of pygofer; style not extending 
nearly as far posteriorly as apex of connective; connective with stem much 
longer than arms; aedeagus slender, without processes, not narrowed near 
midlength in either lateral or caudolateral view; paraphyses elongate, slender, 
tapering gradually, attaining aedeagal apex, the rami arising slightly asym- 
metrically from the basal portion. Female abdominal sternum VII as in S. 
occatoria (Say) (fig. 5892). 
Markings of anterior dorsum as in S. occatoria (fig. 589a); forewing, face, 
thoracic pleura, and venter as in S. huasima, n. sp. 
Holotype male, San Gerdénimo, Guerrero, Mexico, July 2, 1935; one male, 
July 2, 1935, one male and one female, May 30, 1935, and one female, May 
22, 1935, all from Vergel, Chiapas, Mexico (D. M. DeLong collection, OSU). 
S. occaminis, n. sp., is closely related to S. occatoria, from which males may be 
distinguished by the strongly curved pygofer apex, by the aedeagus which is 
not narrowed near midlength, and by the paraphyses which are slightly asym- 
metrical in the origin of the rami in occaminis. 
93. PEGOGONIA, NEw GENUS 
FiGuRE 592 
Type-species: Cicada rufipes Fabricius. 
Length of male 14.0-14.5 mm, of female 14.0-16.0 mm. 
Head slightly produced, median length of crown from slightly less than 
four-tenths to slightly greater than four-tenths interocular width and from 
slightly more than one-fifth to one-fourth transocular width, anterior margin 
broadly rounded in dorsal view, without a carina at transition from crown to 
face, ocelli located behind a line between anterior eye angles, each closer to 
adjacent anterior eye angle than to median line, crown with a transverse con- 
cavity, without median fovea and without sculpturing or setae, lateral clypeal 
