CHIRONOMID MIDGES — SUBLETTE 217 



bristles; fore tarsi heavily bearded; legs black except for trochanters, 

 which are brownish. 



Wing length 4.07 mill.; leg ratio 1.25; antennal ratio 3.G2. 



Abdomen black; each segment pruinose except apically, heavily 

 pilose. 



Female: Unknown. 



This species may be distinguished from all other Nearctic Chir- 

 onomini by the elongate, beaklikc superior appendage and the 

 extremely widened inferior appendage of the male genitalia. 



Tendipcs (Endochironomus) nigricans (Johannsen) 



Chironomus nigricans Johannsen, Bull. New York State Mus., vol. 86, p. 219, 

 1905. 



Males: Wing length, range 3.33-4.51; mean 3.97 mm. (3); leg 

 ratio, range 1.06-1.25; mean 1.15 (3); antennal ratio 2.5, 2.83 (2). 



Females: Wing length, range 3.78-5.47; mean 4.36 mm. (4); leg 

 ratio, range 1.13-1.23; mean 1.16 (3). 



Material examined: In Darb} T : 1 male, Rio Linda, July 16, 1957, 

 D. In USNM: 2 males, Moss Beach, San Mateo Co., Mar. 21, 1948, 

 W; 1 male, Stratford, King Co., July 19, 1947, W; 2 females, Lcmoore, 

 King Co., Aug. 31, 1947, W; 1 female, Mad River Beach, Humboldt 

 Co., Aug. 13, 1948, W. 



Previous California records: Crescent City, Palo Alto, Townes, 

 1945, p. 64. 



Tendipes (Tribelos) hesperius, new species 



Figure 2,o 



Holotype male: USNM 64715, Corcoran, Aug. 22, 1947, W. 



Head dark brown; antennae somewhat lighter brown. Mesonotum 

 and scutellum yellowish brown; postnotum darker brown; halteres 

 pale at base, blackish on knob; dorsolateral bristles in a staggered 

 partially doubled row; prcalar bristles apparent^ 4; scutellum with 

 a transverse straight row of about 12 long erect bristles which emerge 

 from conspicuously darkened alveoli; middle and hind legs entirely 

 stramineous, front legs slightly darker; wing hairs along anterior 

 veins pale and short, not especially conspicuous. 



Wing length 2.22 mm.; leg ratio 1.16; antennal ratio 1.85. 



Abdominal segment 1 brown; segment 2 with basal half brown to 

 dark brown, the apical half paler brown; segments-3 to 5 with the apical 

 band of lighter brown progressively narrowed posteriorly; segments 

 6 to 8 largely dark brown. 



Allotype: Collected with the holotype. 



Slightly darker than the male; abdomen with the segments pro- 

 gressively darker posteriorly, apex of segments 1 to 4 slightly lighter, 

 segments 5 to 8 blackish-brown. Wing length 2.22 mm. ; leg ratio 1.2. 



