188 DIPTERA OP NORTH AMERICA. [PART IV. 



posterior cells, and the unusual size and structure of the male 

 forceps, render the recognition of this genus very easy. 



The position of the subcostal cross-vein near the tip of the 

 auxiliary vein ; the shape of the inner end of the marginal cell, 

 which is broad and not pointed, and before all the presence of five 

 posterior cells — these characters show that there is a wide interval 

 between this genus and the typical Eriopterina. Cladura is 

 placed in this section on account of the absence of the spurs at 

 the tip of the tibiae ; its general appearance is that of Limnophila, 

 and the only character which may be indicative of a relationship 

 to the Eriopterina is the pubescence of the wing-veins, which is 

 more distinct here than is usual among the Limnophilina. 



Cladura (from x%d8o$, branch, and dupij, tail, in allusion to the 

 forceps of the male) was introduced by me in the Proc. Acad. 

 Nat. Sci. Philad. 1859, p. 229. It has not been discovered in 

 Europe, and besides the two North American species described 

 below I know of no others. 



Description of the species. 



!• C. HaTOferrugiiiea O.S. % and 9- — Flavo-ferruginea ; pleurae 

 punctis, abdomen fasciis brunneis ; in cellula submarginali secunda 

 venula transversalis supernumeraria ; venulse transversa omnes in- 

 fuscatse. 



Ferruginous-yellow ; pleurae spotted, abdomen banded with brown ; the 

 second submarginal cell has a supernumerary cross-vein in the middle ; 

 all the cross-veins infuscated. Long. corp. 0.3 — 0.35. 



Syn. Cladura flavoferruginea 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 229. 



Rostrum, palpi, and antennae pale ferruginous ; the two latter 

 infuscated at the tip ; mesonotum ferruginous, shining ; a more 

 or less apparent dark line in the middle ; a brown spot on the 

 humeri; pleurae pale yellow; two brown spots between the 

 humerus and the basis of the wing ; a third one lower, about 

 the middle of the pleurae ; scutellum and metathorax ferruginous ; 

 a small black dot on each side, between the latter and the basis 

 of the halteres ; these are pale ; feet hairy, yellowish ferruginous; 

 tips of the femora, of the tibiae, and of -the tarsi brown. Abdo- 

 men ferruginous ; lateral margins of the segments brown, united 

 by a pale brown band running across the middle of each segment ; 

 venter yellow ; genitals ferruginous, shining. Wings yellowish ; 

 costa, first, and fifth longitudinal veins ferruginous; the other 



