CHIRONOMID MIDGES OF CALIFORNIA — SUBLETTE 95 



Pentaneura {Pentaneura) thryptica, new species 



Figure 26 



Holotj^pe male: USNM 65507, 5 miles west of Gilroy, Santa Clara 

 Co., Sept. 18, 1955 G. 



Clypeus longer than wide, with 14 fine bristles. Dorsal extension 

 of eyes much longer than wide. Palpi 4-segmented ; ratio 38 :47 : 58 : 1 08 . 

 Postocular bristles in single row median to eyes, becoming two rows 

 behind eyes, one row lateral to eyes. Antennal ratio 1.80. 



Head and thorax medium brown, scutellum yellowish-brown, 

 stained with black on posterior surface; scutellar bristles about 22, 12 

 in posterior straight transverse row, and 10 anterior strewn ones, 

 Prealar bristles 9 ; dorsomedial bristles staggered in 2 rows ; dorsolateral 

 bristles in single staggered row; scutellum with 11 large bristles in 

 single posterior row; anterolateral bristles about 7. 



Fore tarsal beard 4 times diameter of tarsus; legs stramineous. 

 Fore tibia with single lyrate spur of 8 bristles (similar to that illustrated 

 for P. lyra, new species), outer bristle on each side somewhat heavier. 

 Middle tibia with one lyrate spur composed of 7 bristles and 1 ordinary 

 somewhat sinuate spur with 6 side teeth. Length of lyrate to normal 

 spur 20:38. Hind tibia with 2 spurs, shorter one sinuate with 5 side 

 teeth almost as long as tip of spur ; longer spur very slender with side 

 teeth obscm-ed; ratio of length of spurs 26:55; comb of 5 bristles. 



Leg proportions: 



Wings well haired; ratio of arculus to m-cu:m-cu to wing tip 0.43. 

 Ri terminates above Cuo; R4+5 ends distal to termination of Cui 

 and proximal to termination of M. Wing length 2.18 mm.; venarum 

 ratio 0.89. 



Abdominal segments blotched with black speckled brown ; irregular 

 whitish patch on each side of tergite. 



Allotype: In USNM: Colored as male except abdomen, almost 

 entirely brown. Dorsal extension of eye almost as wide as long. 

 Clypeal bristles 21. 



Prothorax with 3 fine lateral bristles. Prealar bristles 15; antero- 

 lateral bristles about 18, both large and small bristles. 



This species is distinguished from related North American species 

 in the key (p. 102). 



