Wing'ate : Durham Diptera. 271 



Bibio laniger Myf. Belburn, eig-ht i s and two 9 s, May 1900 ; Shull, 

 one c5 , 1901 ; Harperley, one i and one ? , June 1900 ; Esconib, one 9 , 

 May 1899. 



Bibio johannis L. Witton, one S ; Escomb, one 6, April 1898; Belburn, 

 four is and three 9s, May 1899; Gibsonees, one 6, June 1899: Har- 

 perley, one 6 , June 1900 ; Hesleden, three i s and three 9 s, April 1901. 



Fam. SIMULID^. 



Simulium reptans L. Hesleden, eis^-hteen 9 s, April 1901. 



Simulium latipes Mg. Bishop Auckland, one (5 , Nov. 1900; one 9 , May 

 1902. 



Fam. CHIRONOMID/E. 



Chironomus plumosus L. Common. 



Chironomus annularis Deg-. Hesleden, one (5 , Aug-. 1900; Harperley, 

 three i5 s, iMav 1899. 



Chironomus flaveolus Mg. Bishop Auckland, one 9, July 1900. 



Chironomus pedellus Deg. South Durham, two 6 s. 



Chironomus brevitibia/is Ztt. Bishop Auckland, one 6 and one 9 , May 

 1900. 



Chironomus pictulus Mg. Bishop Auckland, one S, May 1902. 



Chironomus nubeculosus Mg. Bishop Auckland, two 9 s and three 9 s, 

 May 1902. 



Cricotopus tremulus L. Escomb, one 6 and one 9, June 1899; Bishop 

 Auckland, one 9 , June 1897. 



Cricotopus bicinctus Mg. Bishop Auckland, two S s and nine 9 s, May- 

 June 1897-1900. 



Cricotopus annulipes Mg. Bishop Auckland, one 6 and seven 9 s. May 

 1900; Escomb, oue (5 , June 1899. 



Cricotopus sylvestris F. Bishop Auckland, five c5 s and four 9 s, April 

 1902. 



^ Orthocladius dolens Wlk. Gibside, eight i s and one 9 , April 1808. 



OrthocJadius stereorarius Mg. Gibside, one 6 , April 1898 ; Bishop 



Auckland, one S, May 1900; Hesleden, three J s, Augf. T900. 

 Tanytarsus tenuis Mg. Bishop Auckland, one 6 and three 9 s, April, 



May, and Oct. 1897-1900. 

 Tanytarsus fiavipes. Gibside, three 6 s and two 9 s, April 1898; Bishop 



Auckland, one J, April 1898; Harperley, four S s, May 1899. 

 Metriocnemus fuscipes Mg. Bishop Auckland, nine S s and one 9 , 



March 1903. 

 Tanypus varius. Hesleden, one S, April 1901 ; one 9, Aug. 1900. 

 Tanypus nebulosus Mg. Hesleden, one 9 , Aug. 1900 ; Bishop Auckland, 



three S s, Sept. 1902. 

 Tanypus choreus. Hesleden, one 6 , Augf. 1900. 

 Tanypus carneus. Bishop Auckland, one 9 , May 1897. 

 Tanypus melanops Mg. Belburn, one i, May 1900. 



Fam. CULICID.E. 



Culex nemorosus Mg. Bishop Auckland, one 9, July 1900. 



Culex pipiens L. Bishop Auckland, one i and two 9 s, Jan. -Nov. 1900- 



1902 ; Hesleden, one 9 , April 1901. 

 Culex cHiaris L. Bishop Auckland, one c5 and one 9 , May and Aug. 1900. 



Fam. DIXID.^. 

 Dixa aprilina Mg. Gibside, one 6, April 1898. 

 •903 July I- 



