90 PROCEEDINGS OF THE NATIONAL IMUSEUM vol. 115 



While these species differ in details of color, size, etc., thej can be 

 differentiated for certainty only by the structure of the male genitalia. 

 The shape of the basal organ of the male genitalia is diagnostic for 

 this species; the dististyle also appears to be more strongly angulate 

 than in the related Nearctic species. 



Pentaneura {Pentaneiira) chrysos, new species 



Figure Id 



Holotype male: USNM 65505, Pollock Pines, Eldorado Co., 

 June 14,"^ 1948, at light, W. 



Entu-ely pale stramineous except antennal pedicels, vittae, and 

 abdominal fascia pale yellowish-brown. Fixes with long narrow 

 dorsal extension. Antennal ratio 2.26. 



Prothorax broadl}' notched. Prealar bristles about 8; dorsomedial 

 and dorsolateral bristles long and pale; dorsolateral bristles in single 

 row; dorsomedial bristles in single row, elevated on slight elongated 

 tubercle on prescutellar area, with about 3 bristles on each side of 

 tubercle. 



Fore leg proportions: 70:80:62:30:20:15:10. Fore leg ratio 

 0.77; middle leg ratio 0.60. Fore tarsal beard length 6 times tarsal 

 diameter. 



Wings entirely pale except darkened and thickened arculus. K4+5 

 distal to Cui. Katio of arculus to m-cu:m-cu to whig tip 0.44. 

 Wing length 2.96 mm.; venarum ratio 0.87. 



Abdominal tergites wdth basal pale yellowish-brown fascia, indistinct 

 on segment I, segments II to V on basal one-third, segments VI to VIII 

 with most of tergite darkened. 



Female: Unknowm. 



Paratype: In USXM: 1 male collected ^^•ith type. 



Wing length 2.74 nmi.; fore leg ratio 0.75; antennal ratio 2.17; 

 venarum ratio 0.83. 



This species is placed in Edwards' Group D of Penta/neura and in 

 the group which Fittkau (1957) established as genus Thienemunnimyia. 

 In Johannsen (1946, p. 297) the species runs to couplet 8 where it can 

 be distinguished from P. okoboji (Walley) and P. vitellina (Kieffer) 

 (cf. discussion under P. goniodes, new species) by the distinctive male 

 genitalia. 



Pentaneura (^Pentaneura) barberi (Coquillett) 



Figures le.f 

 Tanypus barberi Coquillett, Proc. U.S. Nat. Mus., vol. 25, p. 90, 1902. 



The specimens before me agree well with CoquiUett's original de- 

 scription and, although I have not studied the type material, I have 

 no hesitation as to the specific placement. I am offering the following 



