62 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



R. melliginis, it will be regarded as R. viridulans. Moreover, inasmuch 

 as these two species cannot be separated, as far as I can determine, 

 without examination of the male genitalia and since there is no 

 indication of such examination, previous citations of R. viridulans 

 other than the original may be referable to either R. melliginis or 

 R. mridvlans. 



Ortalis otroeda Walker, 0. quadrijasciata Walker, 0. hilars Walker, 

 and Herina rwfitarsis Macquart have been considered synonyms of 

 R. viridulans by previous workers. I have not seen the types of the 

 aforementioned species and therefore cannot validate these synonyms. 



Rivellia inaeqiiata, new species 



Figure S,i-l 



Holotype: Male. Body length 5.0 mm. 



Head: Frons yellowish brown; upper fronto-orbital plates con- 

 colorous with frons, ocellar triangle slightly blackened. Face with 

 little less than dorsal half pruinose, remainder shining, smooth, pale 

 brownish yellow; parafacials and part of orbits ventral to each eye 

 brownish yellow. Antenna with first and second segments yellow; 

 third segment with base yellow, remainder slightly blackened, the 

 tip pointed anterior^. Anteclypeus concolorous with ventral portion 

 of face. Palpi yellow. Postcranium brownish yellow, lightly prui- 

 nose. 



Thorax: Mesonotum brownish yellow; strong humeral setae 

 absent, posterior dorsocentral setae present. Scutellum and post- 

 scutellum concolorous with mesonotum. Pleura concolorous with 

 mesonotum, mostly shining, pruinosity obscm-e except on sterno- 

 pleuron and laterotergite. Mesopleuron with scattered pale setae on 

 posterior half. Sternopleuron with narrow pruuiose strip on ventral 

 margin, a narrower strip on posterior margin; disc with scattered pale 

 setae. Pteropleuron with scattered pale setae on disc, few black 

 setae present ventral to subalar. Laterotergite pruinose on ventral 

 one-third. Prosternum yellow. 



Thoracic appendages: Front legs: Coxae, femora, and tibiae j-eUow; 

 tarsi blackened from tip of first sognieiit, remainder of first seg- 

 ment yellow. Middle legs: Coxae brownish yellow; femora and 

 tibiae yellow; tarsi blackened from third segment, remaining segments 

 yellow. Hind legs: Coxae yellow; femora yellow; tibiae brownish yel- 

 low; tarsi blackened from second segment, remaining segments yellow. 



Wing (fig, 3,i) length 3.2 mm., width 1.2 mm. Bands dark brown. 

 First and second bands joined at costal margin; third and fourth 

 bands joined at costal margin. The part of first basal cell contiguous 



