204 DIPTERA OF NORTH AMERICA. [PART IV. 



Synoptical table of the species.^ 



I. Five posterior cells. 



A. Antennae of the male much longer than those of the female. 



1 macrocera -SV;^. 5 tenuicornis, n. sp. 



2 unica, n. sp. 6 niveitarsis, n. sp. 



3 fasciolata 0. S. 7 tenuipes Sui/. 



4 poetica, n. sp. 



B. Antennse of the male not conspicuously longer than those of the 



female. 



8 recondita, n. sp. fSulig. EPHELIA.) 



9 imbecilla 0. S. 19 aprilina 0. S'. 



10 toxoneura 0. S. (Subg. DICRANOPHRAGMA.) 



11 areolata 0. S. 20 fuscovaria 0. S. 



12 adusta 0. S. (Subg. PRIONOLABIS.) 



13 luteipennis 0. S. 21 rufibasis 0. S. 



14 contempta, n. sp. 22 munda, n. sp. 



15 inornata, n. sp. (Subg. DACTYLOLABIS.) 



16 fratria, n. sp. 23 montana 0. S. 



17 brevifurca 0. S. 24 cubitalis 0. S. 

 IS ultima 0. S. 



II. Four posterior cells. 



25 quadrata 0. S. 26 lenta 0. S. 



Description of the species. 

 I. Five posterior cells. 



A. Antennae of the male much longer than those of the female. 



1. l<. macrocera Say. % and 9 • — Nigra, nitida ; antennae maris 

 longitudine corporis, filifornies, pilosse ; alse fusco maculatse. 



Black, shining; antennae of the male as long as the body, filiform, beset 

 with hairs ; wings spotted with brown. Long. corp. 0.3 — 0.4. 



Stn. Limnobia macrocera Say, Journ. Acad. Phil. Ill, p. 20, 2. — Wiede- 

 mann, Auss. Zw. I, 34, 19. 



Cijlindrotoma macrocera Macquart, Hist. Nat. Dipt. I, 108, 2. 



Limnophila (Lasiomastix^ macrocera 0. Sacken, Proc. Ac. Nat. Sc. 

 Phil. 1859, p. 234. 



Head black, shining ; ftont above the antenna?, and lower part 

 of the head yellowish-ferruginous ; rostrum and palpi black ; 

 antennae black, except the basal joints, which are reddish ; an- 



' This arrangement is purely artificial and therefore provisional ; com- 

 pare p. 197. 



