CHIRONOMID MIDGES — SUBLETTE 221 



Sclma, July 10, 1947, W. In Darby: 1 male, July 15, 1957, 1 male, 

 July 8, 1957, 2 males, July 31, 1957, 3 males, Aug. 4, 1958, D. 



Wing length, range 1.77-2.0; mean 1.88 mm. (7); leg ratio, range 

 1.47-1.61; mean 1.56 (4); antennal ratio, range 1.97-2.43; mean 

 2.24 (6). 



Female: Unknown. 



The presence of space macrotrichia on the wing membrane serves 

 to distinguish this species from all other Nearctic Cryptochironomus. 

 The male genitalia most closely resembles that of T. potamogeti 

 (Townes) but differs in having the lateral bristle of the superior 

 appendage more proximal. 



Terulipes (Cryptocliironomns) durbyi, new species 



Figure 2,c 



Holotype male: USNM 64717, Rio Linda, Sacramento Co., July 10, 

 1957, D. 



Head pale green becoming brown on clypeus and mouthparts. 

 Antennal pedicel blackish brown, flagellum and plumes pale brown. 

 Thoracic ground color pale green; vittae, mesosternum, a small spot 

 on pleura ventral and slightly anterior to wing bases, and posterior 

 half of postnotum blackish brown, strongly contrasting with the 

 ground color; anterior end of median and posterior end of later;!! 

 darker brown than remainder of vittae. Prealar bristles 2 ; dorsolateral 

 bristles in a single row; scutellum with a transverse row of 6 pale, 

 erect bristles; halteres pale green. Wings milky by reflected, brown 

 by transmitted light; squamal fringe with about 8 hairs (paratype). 

 Legs pale green; fore leg entirely dusky beyond middle of femur; 

 middle and hind legs dusky only on tarsi. 



Wing length 2.5 mm.; leg ratio 1.27; antennal ratio 2.5. 



Abdominal segments 1 to 4 pea green becoming dark brown on 

 segments 5 to 8 (paratype). 



Genitalia very similar to that of T. ariel, new species but less 

 massive. 



Female: Unknown. 



Paratypes: In USNM: 2 males, Stratford, July 8, 1947; 1 male, 

 collected with the type. In Darby: 1 male, Davis, July 3, 1957, D. 

 In UC, Davis: 1 male, Davis, June 8, 1958, J. C. Hall. 



Wing length, range 1.55-1.74; mean 1.68 mm. (4); leg ratio, range 

 1.34-1.4; mean 1.37 (3) ; antennal ratio, range 2.6-2.82; mean 2.71 (4). 



This species with its dusky fore legs and its distinctive genitalia 

 can only be confused with T. {Cryptochironomus) ariel, new species. 

 T. darbyi can be separated by its smaller size, lighter color, smaller 

 antennal ratio and different genitalia. 



I am happy to name this species after R. E. Darby. 



