CHIRONOMID MIDGES OF CALIFORNIA — SUBLETTE 117 



very sparse, in single row of 5 bristles behind eye. About 8 clypeal 

 bristles. Palpi 3-segmented, ratio (length times width) 14 x 9 : 16 x 6 : 

 15x5. 



Head behind eyes, small pleural area, lateral margins of pronotum 

 and scutellum yellowish, latter somewhat infuscate; mesonotum 

 greyish-black, heavily overlaid with greyish pollen; postnotum shining 

 black. Tubercle of mesonotum yellow, prominent, and strongly con- 

 trasting. Pronotum parallel-sided to apex (or very slightl}^ produced 

 in paratypes); 13 fine lateral bristles; covered completely by micro- 

 trichia. Haltere knob white, stalk black. Wing spotted with dark 

 brown on hyaline membrane in distinctive pattern. Wing length 3.51 

 mm.; venarum ratio 1.01. Supra-alar bristles 2, 1 large, 1 small; 

 prealar bristles 5; dorsolateral bristles in single row becoming multi- 

 serial just anterior to scutellum where about 10 to 12 bristles form 

 clump; anterolateral bristles 4; scutellum with 12 large bristles in 

 posterior transverse row. 



Fore tarsal beard 7 times diameter of tarsus. Fore tarsal spur 

 smooth, slightly curved spine, one minute side barb; spur length :tibia 

 apex diameter 55:65; middle tibia with two slender spurs, each 

 slightly curved, with two basal slender filiform side teeth; ratio of 

 length of spurs 38:40. Hind tarsal spur same as middle leg; ratio of 

 spurs 50:50; no apparent comb. 



Leg proportions: 



Each segment of abdomen with apical narrow band of infuscate 

 yellow; basal fascia greyish-black; about 160 bristles on segment II 

 tergite. 



Allotype: In USNM: Collected with holotype. 



Except for sexual differences, like male. Wing spots somewhat 

 larger and darker and pronotum slightly produced. Wing length 

 3.66 mm.; fore leg ratio 0.68; hind leg ratio 0.80; venarum ratio 1.05. 



Paratypes: In USNM: 1 male, Saratoga Springs, Death Valley, 

 May 30, 1953, W; 1 male, 1 female, Palo Verde, Imperial Co., Apr. 

 8, 1949, lake margin, W. In UCD: 1 female, Davis, Aug. 1, 1955, 

 D. C. Green; 1 female, Davis, May 14, 1952, S. In UCLA: 54 males, 

 24 females, Saratoga Springs, Death Valley, March 19, 20, 1955; 33 

 males, 2 females, Saratoga Springs, Death Valley, May 27, 29, 1955, 

 B et al.; 12 males, Saratoga Springs, Death Valley, Apr. 23, 24, 1955; 



1 male, 2 females. Salt Springs, Death Valley, San Bernardino Co., 

 March 24, 1957; 1 female, Lancaster, Los Angeles Co., May 13, 1953; 



2 males, 2 females, Huntington Beach, Feb. 21, 1950; 1 male, Kesting 



680-447—63 3 



