846 CHARLES PAUL ALEXANDER 



(In older specimens the wing pattern shows on the sheath and is not distinctly fasciate as 

 in E. fascipennis.) 



Cephalic crest (Plate XXXVII, 166) erect, rectangular, the outer lateral angles directed 

 ventrad and laterad as powerful chitinized spines, which in most cases curve outward; a 

 stout seta beneath each spine. Labrum subtruncated or indistinctly bilobed at apex. 

 Labial lobes triangular, projecting caudad as two cones. Maxillary palpi bent backward, 

 lying along margin of cheek, stout, tapering suddenly to blunt tips. Cheeks projecting 

 as flattened ledges. Antennae moderate in length, on scapal segment with a flattened 

 tubercle on either side of cephalic crest; antennae extending rather far beyond wing 

 root. 



Pronotal breathing horns (Plate XXXVII, 164) with base enlarged, the elongate, subchiti- 

 nized tips gradually narrowed, and the extreme apices subacute; breathing horns at tips 

 cirected ventrad and proximad; a truncated setiferous tubercle before each breathing horn. 

 Mesonotum very deep. A short, but high, median crest behind breathing horns. Lateral 

 angles of thorax produced into a slender lobe bearing a stout seta at tip. Wing sheaths 

 ending opposite base of third abdominal segment. Leg sheaths terminating just before end 

 of fifth abdominal segment; middle tarsal sheaths usually a little shorter than the others; in 

 some specimens, especially females, fore legs the shortest, hind legs the longest. Abdominal 

 segments (Plate XXXVII, 167) with two narrow basal rings and a broader posterior ring. 

 Tergites on segments 2 to 7 near caudal margin of posterior ring with a narrow transverse 

 crossband densely beset with acute spicules; on posterior segments these bands becoming 

 gradually weaker, on segment 7 being very weak; two setae near lateral margin of posterior 

 ring at about midlength. Pleurites with a transverse oval area with about twenty sharp spines 

 near caudal margins of segments; a stout seta lying cephalad of this area. Spiracles distinct, 

 oval, lying on ventral cephalic part of pleural posterior ring; a seta near dorsal margin of 

 second basal ring. Sternites with a transverse band of spicules on segments 5 to 8, these 

 being weakest on segment 5 at ends of tarsal sheaths and very strong and powerful on seg- 

 ment 8, where the band is interrupted medially; band often rather narrow but sometimes 

 much broader. A seta near midlength of posterior ring on either side. Male cauda (Plate 

 XXXVIII, 170) with dorsal lobes very stout, globose at base but soon narrowed into slender 

 cylindrical appendages, each bearing three setae at tip; viewed from above, these lobes are 

 seen to be separated by a wide U-shaped notch; ventral lobes blunt and with a flattened 

 depressed disk at base of incision; eighth segment with a wide rectangle of lobes, two 

 posterior lobes that are weakly setiferous and two smaller anterior lobes with a large 

 spiracle proximad of each. Female cauda (Plate XXXVIII, 171) with tergal valves a little 

 longer than sternal valves, upcurved, and with a stout seta before tip. 



Nepionotype. Plummers Island, Maryland, May 19, 1913. 



Neanotype. With type. 



Paratypes. Larvae and pupae with type. 



Epiphragma fascipennis (Say) 



1823 Limnobia fascipennis Say. Journ. Acad. Nat. Sci. Phila., vol. 3, p. 19. 



1859 Limnophila (Epiphragma) pavonina O. S. Proc. Acad. Nat. Sci. Phila., p. 239. 



1869 Epiphragma fascipennis O. S. Mon. Dipt. N. Amer., part 4, p. 194. 



