10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. es 



Described from a single male, collected at Olga, Siberia, July 1923 

 (T. D. A. Cockcrell). 



Type.— Male, Cat. No. 28361, U.S.N. M. 



This interesting new species is named in honor of the collector, 

 Prof. T. D. A. Cockerell. 



Genus RHAPHIDOLABINA Alexander 



1916. Rhapfiidolabina Alexander, Proc. Acad. Nat. Sci. Phila., pp. 540-541. 



RHAPHIDOLABINA SIBIRICA. new species 



General coloration pale whitish yellow; legs yellow, only the ter- 

 minal tarsal segments infuscated; wings whitish subhy aline with a 

 relativel}^ heavy pale brown pattern, the costal region infuscated bas- 

 ally; r present; abdominal tergites indistinctly bicolorous. 



Male. — Length about 5 mm,; wing, 6.5 mm. 



Rostrum reddish flesh-color, the palpi pale yellow. Antennae 

 short, the scapal segments reddish; flagellum yellow, the terminal 

 segments a little infuscated. Head yellowish brown. 



Pronotum and mesonotum very pale whitish yellow, without dis- 

 tinct markings. Pleura whitish yellow. Halteres pale, the knobs a 

 little more yellowish. Legs whitish yellow, only the terminal tarsal 

 segments infuscated. Wings whitish subhyaline, with a relatively 

 heavy pale brown pattern; cell 1st C and basal half of cell Snd 

 infuscated; interrupted areas in cells Sc and Sc^, including a large 

 basal area and spots at Sc^, above the origin of Rs and at the tip of 

 Sci; these dark areas in cell Sc extend caudad into cell R but do not 

 quite reach vein M; narrow brown seams along the cord and outer 

 end of cell 1st 1/, and on the outer deflection of vein R^; a circular 

 brown cloud at tip of vein R3 and a smaller one at tip of vein Ri] 

 brown spots and dots at ends of veins 1/,, M^, Cu^, Cu^, and 2nd A; 

 smaller spots at fork of M^+^ and along the bases of veins Cu, 1st A, 

 and 2nd A; prearcular cells largely dark. Venation: Rs strongly 

 angulated at origin; r present, as in R. dicranotoides Alexander 

 (Japan); fusion of i?, and tip of R.^ very short to punctiform; R^ 

 gently arcuated; cell M^ a little longer than its petiole; cell 1st M^ 

 with the inner end pointed, r-m close to this point; m about two- 

 thirds the outer deflection of JX,; basal deflection of Cu, about two- 

 fifths its length beyond the fork of M. Wings relatively broad, 

 widest opposite the origin of Rs. 



Abdomen with the terg;ites indistinctly bicolorous, the caudal 

 margins darker brown than the bases; basal sternites pale yellow; 

 hypopygium dark brown. 



Described from a single male, collected at Amagu, Kudia River, 

 Siberia, ,}^ily 1923 (T. D. A. Cockerell). 

 Tvpe.—UixlQ. Cat. No. 28362, U.S.N.M. 



