222 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Tendipes (Cryptochironomns) ariel, new species 



Figure 2,d 



Holotype male: USNM 64718, Topaz Lake, Mono Co., June 5, 

 1948, W. 



Head, thorax and abdomen blackish-brown with a faint suggestion 

 of a dark olive green ground color. Dorsolateral bristles in a single 

 row; prealar bristles about 5. Haltere kuob whitish, pedicel blackish- 

 brown. Wings somewhat milky by reflected light, brownish-purple 

 by transmitted light; squama with 10-12 bans. Legs dark brown; 

 basal one-third of femora somewhat paler; fore tarsi heavily bearded. 



Wing length 2.59 mm.; leg ratio 1.37; antennal ratio 3.47. 



Abdomen heavily pilose, the long hairs arising from very distinct 

 alveoli. 



Genitalia: The shape of the ninth tergite as figured for T. darbyi 

 and this species would indicate a distinctiveness which is not real, as 

 is shown by intermediates in the paratypic series of this species. 

 The difference is interpreted as a variation in mounting technique. 



Female: Unknown. 



Paratypes: Five males collected with the holotype (USNM). 



Wing length, range 2.41-2.74; mean 2.6 mm. (5); leg ratio, range 

 1.24-1.46; mean 1.37 (5); antennal ratio, range 3.17-3.5; mean 3.34 (5). 



Of the Nearctic fauna, this species can be confused only with T. 

 darbyi, new species. The two species may ultimately prove to be 

 extremes of a clinal series. However, in the absence of individuals with 

 intermediate characteristics the two are considered separate species. 



Tendipes (Cryptochironomus) alpJiaeus, new species 



Figure 2,e 



Holotype male: USNM 64719, King's River Canyon, July 20, 

 1947, W. 



Head and most of thorax dark brown; anterior pleural areas, spaces 

 between vittae and scutellum somewhat paler; mesonotum and anten- 

 nal pedicel heavily dusted with greenish-gray pollen; halteres whitish, 

 base somewhat infuscate; squama with at least 3 hairs; middle and 

 hind tibiae each with 2 spurs; legs stramineous, knees somewhat 

 darker. 



Wing length 1.92 mm.; leg ratio 1.64; antennal ratio 1.8. 



Abdomen brown with a dark olive green tinge; incisures slightly 

 darker; apical segments progressively darkened to a dark brown. 



Genitalia very similar to undine (Townes) but differing in having a 

 more spatulate anal point, a superior appendage of a slightly different 

 shape and orientation and an inferior appendage which is shorter 

 and broader. 



