384 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iii 



The relationships of the subgenera of Bhytidoporus reflects the 

 same situation that Osborn (1933) pointed out for many of the 

 Auchenorrhynchus Homoptera. The forms that occur on the eastern 

 end of the Antilles chain are more closely related to those of the 

 western part of the chain and in Central America than to those 

 occurring on the South American continent. The West Indian 

 Rhytidoporus (sen. str.) are certainly more closely related to Bergthora 

 than to the South American Findalia. 



Key to the subgenera of Rhytidoporus 



1. Submargiu of head with two submarginal setigerous punctures, one in front 



of eye and one half way to apex; metapleural evaporatorium reaching 



lateral margin of segment Findalia Jensen-Haarup (p. 392) 



Submargin of head (including apex of clypeus) with row of coarse, close- 

 set setigerous punctures; metapleural evaporatorium not reaching lateral 

 margin of segment 2 



2. Costa with one to three setigerous punctures; osteolar auricle distinctly 



developed (fig. 92) Rhytidoporus Uhler (p. 384) 



Costa with about 15 setigerous punctures; osteolar auricle absent 

 (fig. 93) Bergthora Kirkaldy (p. 390) 



Subgenus Rhytidoporus (Rhytidoporus) Uhler 



Rhytidoporus Uhler, 1877, p. 380. 



Diagnosis.— The submarginal row of setigerous punctures on the 

 jugum coupled with the few setigerous punctures on the costa will 

 define this subgenus. 



Type of subgenus.^ — Rhytidoporus indentatus Uhler (1877, p. 380), 

 monobasic. 



Distribution. — The members of this subgenus apparently are 

 native to the West Indies, although one species has invaded the south- 

 ern part of peninsular Florida on the mainland. This is in contrast 

 to the lone species of each of the other two subgenera which have 

 continental ranges. 



Discussion. — The included species appear rather closely allied to 

 each other, obsoletus, new species, being the most distinct. 



Key to species of the subgenus Rhytidoporus {Rhytidoporus) 



1. Ocelli present, prominent; membrane longer than basal width 2 



Ocelli absent; membrane short, length not greater than basal width. 



obsoletus, new species (p. 389) 



2. Pronotum lateralh'^ with submarginal row of ten setigerous punctures; terminal 



process of peritreme limited apically by narrow strip of evaporatorium 



(fig. 93b) diminutus (Ruckes) (p. 386) 



Pronotum laterally with submarginal row of five or six setigerous punctures; 

 terminal process of peritreme extended all the wav to edge of evaporatorium 

 (fig. 92) ; 3 



