132 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



R44.5 terminates proximal to M; f-Cu proximal to r-m. Anal vein 

 reaches almost to wing tip. Wing length 4.63 mm.; venarum ratio 

 0.92. 



Abdomen black except venter and genitalia dark brown. 



Females: Wing length, range 4.37-5.11; mean 4.75 mm. (4); leg 

 ratio, range 0.67-0.72; mean 0.70 (4) ; venarum ratio, range 0.90-0.97; 

 mean 0.94 (4). 



Material examined : In USNM : 2 females, Willow Creek, Fandango 

 Pass, Modoc Co., May 15, 1948, W; 1 female, Alturas, Modoc Co., 

 July 16, 1948, at light, W; 1 female, Nevada Co., northwest of Cisco, 

 May 16, 1948, W. In UCD: 1 female, Ukiah, Feb. 23, 1959, S. M. 

 Fidel, light trap. 



These specimens agree well with descriptions of D. nivorunda 

 (Fitch) Johannsen; however, in the absence of the male with its 

 diagnostic genitalia this identification is not positive. 



Appendix 



Tanypus punctipennis Meigen (Edwards) 



Figures 7d,e 



Tanypus punctipennis Meigen, Systematische Beschreibung der Europaischen 

 zweifliigeligen Insekten, vol. 1, p. 61, 1818. 



This description is taken from a male in BM(NH): Beesands, 

 South Devonshire, June 8, 1920, F. W. Edwards, 1920-229. 



Head greyish-brown; antennal pedicel dark brown. Palpi with 4 

 segments, 1 and 2 subequal; antennal ratio 2.14. 



Thorax dark greyish-brown, vittae outlined by whitish pollen, 

 pleura and scuteilum infuscate yellow. Pronotum strongly produced 

 apically. Mesonotum with rather low, somewhat elongate tubercle, 

 dark yellowish-brown; second very small tubercle in center of pre- 

 scutellar area. Postnotum shining dark brown. Halteres yellowish- 

 white, slightly infuscate below knob. Prealar bristles about 14; 

 dorsomedial bristles extend laterally in one row behind tubercle to 

 join dorsolateral bristles. Dorsolateral bristles in single row forming 

 group of 3 bristles just anterior to scuteilum. Scuteilum with 16 

 bristles in posterior transverse row. Anterolateral bristles 3 to 5. 



Fore tarsi with beard 6 times tarsal diameter ; femora infuscate with 

 clear yellow subapical fascia, space between yellow fascia and joint 

 darker than remainder; thus in certain lights femora appears dusky 

 with dark brown apical band. Tibiae infuscate yellow, with distinct, 

 rather broad sub-basal brown band, apex narrowly darkened as are 

 apices of tarsal segments 1 to 3 ; 4 and 5 largely dark. 



