204 DIPTERA OP NORTH AMERICA. [PART IV. 



Synoptical table of the species. 1 



I. Five posterior cells. 



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



1 macrocera Say. 5 tenuicornis, n. sp. 



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



3 fasciolata 0. S. 7 tenuipes Say. 



4 poetica, n. sp. 



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



female. 



8 recondita, n. sp. (Subg. 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. 



18 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. Lr. macrocera Say. % and £. — Nigra, nitida; antennae maris 

 longitudine corporis, filiformes, pilosae ; alae fusco maculatae. 



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. 



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

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

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

 Limnophila (Lasiomastix) macrocera O. Sacken, Proc. Ac. Nat. Sc. 

 Phil. 1859, p. 234. 



Head black, shining ; front above the antennaB, and lower part 

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

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



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

 pare p. 197. 



