4 PROCEEDINGS OF THE NATIOI^TAL MUSEUM, vol. 60. 



Holotype.—M2i\Q, Tiribi, October 9, 1920 (A. Alfaro). 

 Type'—C^i. No. 24695, U.S.N.M. 



RHIPIDIA (RHIPIDIA) LONGISPINA, new species. 



Antennal flagellum with segments two to ten each with two pecti- 

 nations ; femora with a brown subterminal ring, terminal tarsal seg- 

 ments black; wings subhyaline, variegated with brown and gray, 

 there being four brown costal blotches; basal deflection of Cy^ before 

 the fork of M ; spines on the ventral pleural appendage of the male 

 hypopygium very long and slender. 



Male. — Length about 4.5 mm.; wing 5.8 mm. 



The type is badly crushed. 



Rostrum and palpi dark brown. Antennae dark brown, the pedi- 

 cels of the flagellar segments somewhat paler; flagellar segments 

 rather short, pectinate; first flagellar segment not pectinate, merely 

 enlarged into a hemisphere whose proximal face is slightly produced ; 

 flagellar segments two to ten each, with two pectinations which 

 become shorter on the terminal segments; flagellar segment eleven, 

 Avithout distinct pectinations, the inner face slightly produced ; termi- 

 nal segment simple, the apex prolonged into a slender point. Head 

 dark brown. 



General coloration of the thorax dark brown without clearly 

 defined markings. Halteres brown. Legs with the coxae and tro- 

 chanters dark brown ; remainder of the legs pale testaceous brown, the 

 femora udth a brown subterminal ring, the tips narrowly obscure 

 yellow; terminal tarsal segments black; claws with a single, con- 

 spicuous, basal spine. Wing-pattern somewhat suggestive of R. 

 (Arhipidia) domestica; ground-coloration subhyaline; a series of 

 four brown costal blotches, darker in cell Sc^ the third at the origin 

 of Rs^ the last at Sc; the interspaces between the first three of these 

 dark markings are narrower than the areas; stigma with a pale 

 center; cord and outer end of cell 1st M^ seamed with gray; gray 

 washes in the centers of all the cells beyond the cord with the excep- 

 tion of 1st M^; cubital and anal cells gray, sparsely variegated with 

 subhyaline, the most conspicuous blotch being in cell 1st A opposite 

 the end of vein 2nd A ; axillary angle not conspicuously pale as in 

 the subcostalis group ; veins brown. Venation : Sc long, Sc-^ ending 

 about opposite three-fifths the length of Rs; Sc^ at tip of Sc^^; Rs 

 long, arcuated at origin; deflection of i?4+5 arcuated, a little less than 

 one-third the length of Rs,- r-97i a little shorter than 7'/ cell 1st M^ 

 closed ; ???. a little shorter than the deflection of il/g and slightly arcu- 

 ated ; basal deflection of Cu^^ at about one-third its own length before 

 the fork of M. 



Abdomen dark brown, the sternites paler. Male hypopygium with 

 the proximal face of the pleurite produced proximad and caudad 

 into an obtuse lobe; ventral pleural appendage a fleshy lobe that is 



