70 DURHAM DIPTERA. 



XII. 97. 



18 (17). Frons and face dark. End of the femora in both 

 sexes with a dark ring. 



68o. Limnobia trivittata, Schum. 

 Hesleden, 4 $, 4?, 13-8-00. 



(See also the first three species in the next table). 



98. Dicranomyia, Steph. 



1 (6). There seem to be three species in which the generic 



character of the position of the base of V.2. in 

 regard to the end of V.I. a. is not a good guide, as 

 V.I .a. ends somewhat in front of the base of V.2. 



2 (3). Thorax orange yellow. 



(681. Limnobia macrostigma, Schum.) 



3 (2). Thorax dark. 



4 (5). O. absent, 4.b. forked. Wings not hairy. 



(682. aquosa, Verr.) 



5 (4). O. present or 4.a. forked. Apical region of the wing 



hairy. (683. pilipennis) 



6 (1). V.I. a. ends before or opposite the base of V.2. 



7 (24). Thorax not shining black. 



8 (19). Wings quite clear, without either spots or clouds 



other than the stigma, or a cloud about the base 

 of V.2.a., or the X-veins clouded, but without 

 distinct spots. 



9 (10). Outer half of the antennal joints elongate. 



684. Dicranomyia modesta, Mg. ? 

 Bishop Auckland, 1 $, 27-6-02; Brancepeth, 1 $, 

 15-6-02. 



10 (9). Outer half of the antennal joints not elongate. 



11 (14). Distinctly yellow species. 



12 (13). Antennas all blackish, male genitalia with a long 



process beneath. 



685. Dicranomyia mitis, Mg. ? 

 Bishop Auckland, 1 £, 4-9-00. 



13 (12). Antenna? yellowish at the base, male genitalia with- 



out any long process beneath. (686. lutea, Mg.) 



