92 DURHAM DIPTERA. 



XV. 142. 



2 (3) (4). Under side of the abdomen entirely whitish- 



yellow, except at the base. 



(852. pantherinus, L., £) 



3 (2) (4). Under side of the abdomen whitish-yellow, with a 



double row of black spots on the first, second, 

 third, and fourth rings. (854. notatus, Mg., $) 



4 (2) (3). Under side of the abdomen black with yellow 



incisions, and a large yellow central spot at the 

 base. (853. uliginosus, L., $) 



5 (1) (10). Upper side of the abdomen black with whitish- 



yellow spots or bands. 



6 (9). Face much produced, beaklike, the distance from the 



tip of the same to the eye margin as great as 

 the breadth of the eye. 



7 (8). No white spots above the antennae, but in their place 



a distinct impression. (852. pantherinus, L., ?) 



8 (7). Above the antennas two small pale yellow oblong 



spots, which are broken in the middle. 



(853. uliginosus, L., $) 



9 (6). Face but little protruding, the distance from the front 



of the same to the eye margin not more than 

 half the width of the eye. (854. notatus, Ztt., ? ) 

 10 (1) (5). Upper side of the abdomen entirely black. 



(855. nigrinus, Fin.) 



143. Oxycera, Mg. 

 Larvae live in slimy mud. . 



1 (20). Abdomen chiefly black with yellow spots or bands. 



2 (3). Wings with a brown spot beneath the stigma. 



(856. ana/is, Mg.) 



3 (2). Wings without a spot below the stigma. 



4 (7). Upper side of the abdomen black with at most the 



tip yellow. 



5 (6). Dorsum with a yellow stripe on each side. Antennae 



longer than the head. (860. tenuicornis, Mcq.) 



6 (5). Dorsum all black. (862. terminata, Mg.) 



