20 M. W. NIELSON 



that it was collected on weeds and grasses in Mississippi, Solidago in Tennessee, 

 and Silphinum perfoliatum in Missouri. It is prevalent from May to October in 

 southern U.S. 



Remarks. Tinobregmus vittatus is a variable species with a range of size, colour 

 and head characteristics, which show some evidence of geographical gradations. 

 Populations from the Mississippi Valley are larger, and have more produced crown 

 than populations westward in Texas and Mexico. Colours of the elytra are more 

 uniformly golden-yellow, with typical apical black band in both sexes of populations 

 from the Mississippi Valley. Western and eastern populations of males are pale 

 ivory with apical black band whereas females are uniformly stramineous without 

 the apical black band. The morphological characteristics of the male genitalia 

 among various species described in Tinobregmus are identical, thus there is no 

 basis for validating the species that are synonymized under vittatus. 



Tribe SANDERSELLINI DeLong 



Sandersellini DeLong, 1945a : 414. Type-genus: Sandersellns DeLong. 



Medium size, slender, cixiid-like leafhoppers. 



Head elongate, very narrow, length about twice as long as interocular width; crown strongly 

 produced anteriorly beyond proximal margin of eyes, disk strongly carinate laterally and 

 elevated above eyes ; pronotum large with 2 lateral carinae on each side and a distinct longitudinal 

 carina medially; scutellum large, median length about equal to median length of pronotum; 

 elytra and hind wings well developed, appendix well developed, venation slightly obscured, 

 outer anteapical cell closed; clypeus long and narrow, lateral margins slightly sinuate, surface 

 depressed slightly subapically; clypellus short, lateral margins nearly parallel, extending 

 distally beyond genae, surface elevated medially; setal arrangement on hind femur 2 : 2 : 1. 



Male genitalia symmetrical. Aedeagus and style well developed. 



The tribe occurs in the neotropical region. One genus, Sander sellus DeLong, 

 is recognized from South America. The combination of characters of one pair 

 of lateral carinae on each side of the pronotum and a median pronotal carina 

 separates Sandersellini from other tribes in the subfamily. The tribe has no 

 close relatives owing to the uniqueness of these characters. 



Genus SANDERSELLUS DeLong 



(Text-figs 23-63) 



Sander sellus DeLong, 1945a : 414. Type-species: Sandersellus carinatus DeLong, by original 



designation and monotypy (DeLong, 1945a : 415). 

 Cixidocoelidia Linnavuori 1956 : 34. Type-species: Cixidocoelidia truncatipennis Linnavuori, 



by original designation and monotypy (Linnavuori, 1956 : 34). Syn. n. 



Medium size, elongate leafhoppers. 



Colour fuscous throughout with numerous, irregular spots on elytra and small orange 

 circular spots along veins of elytra, irregular markings on surface of crown, pronotum and 

 scutellum. General habitus among all known species of the genus is remarkably similar. 



Head much narrower than pronotum; crown strongly produced anteriorly with lateral 

 margins strongly carinate; eyes large, elongate, occupying the greater portion of the head; 

 pronotum bicarinate laterally and unicarinate medially; elytra well developed, broad apical!)-, 



