216 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Becbtel; 2 females, Davis, May 12, 1955, D. L. Dahlstep; 1 male, 

 1 female, Davis, Nov. 6, 1937, G. Spurlock; 1 male, Antioch, May 

 18, 1936. 



Previous California records: Los Angeles; Palmdale; San Diego, 

 Townes, 1945, p. 132. 



Tendipes (Tendipes) dorsalis (Meigen) 



Chironomus dorsalis Meigen, Systematische Beschreibung der Europaischen 

 zweifliigeligen Insekten, vol. 1, p. 25, 1818. 



Male: Wing length 3.85 mm.; leg ratio 1.6; antennal ratio 3.0. 



Material examined: In Darby: One male, Carmichael, Sacramento 

 Co., Dec. 8, 1957, D. 



In addition there is one female which probably belongs here, with 

 a wing length of 3.22 mm. and a leg ratio of 1.68. Material examined: 

 (USNM), Heather Lake, Sequoia National Park, 9,000 ft., Aug. 9, 1947. 



Wirthiella, new subgenus 



Diagnosis: Pronotum broad, collarlike; scarcely narrowed medially, 

 with a very slightly discernable notch; slightly inferior to anterior 

 end of mesonotum; palpi of normal length; fork of Cu distal to r-m; 

 R2+3 distinctly separated from Ri and terminates half way between 

 Ri and R*+ 5 ; tarsal beard present. 



Male genitalia: Superior appendage elongated, beaklike; inferior 

 appendage extremely widened apically, with numerous conspicuous 

 bristles. 



Type species: Tendipes (Wirthiella) modocensis, new species. 



It is with pleasure that I name this subgenus in honor of Dr. 

 Willis W. Wirth. 



Tendipes (Wirthiella) modocensis, new species 



Figure \,g 



Holotype male: USNM 64714, inspection station, Alturas, 

 Modoc Co., May 15, 1948, stream margin, W. 



Head entirely black; antennal pedicels large, contiguous, thus 

 making it impossible to see if frontal tubercles are present or absent. 

 Palpi normal, ratio 10:32:25:26. 



Thorax black except small infuscate yellowish pleural area; lightly 

 greyish pruinose; mesonotum with 2 inconspicuous tubercles on 

 the median line, one at the anterior end of the prescutellar area, the 

 other at the posterior, immediately in front of the scutellum; prealar 

 bristles about 5; dorsolateral bristles in a single, staggered row; 

 haltere knob infuscate yellow, stalk black; scutellum with many strewn 



