992 CHARLES PauL ALEXANDER 
afew short setae on body, especially on thoracic segments. Spiracular disk (Plate LXXXIX, 
490) large, flattened, surrounded by six lobes; dorsal pair very small, represented by twoshort, 
conical protuberances; lateral and ventral lobes slender, the latter a little the longer, each 
with three or four long, delicate setae at tip and two or three others before tip on outer face; 
a long seta on margin of disk between dorsal and lateral lobes; spiracular disk and lobes 
entirely unmarked with darker. Spiracles small, circular, stigmal rings very narrow; spir- 
acles separated by a distance equal to about three times diameter of one. Anal gills four, 
large, pinnately branched, each gill with six lateral branches. 
Head capsule massive, of the tipuline type. Labrum with a distinct, densely hairy lobe 
on either side. Mentum (Plate LXXXIX, 488) large; anterior margin with nine slender 
teeth, median one the longest, outermost teeth on either side blunt, flattened, evidently 
formed by fusion of two teeth. Hypopharynx (Plate LX X XIX, 489) five-toothed; teeth 
blunt, the three middle ones larger, the lateral tooth on either side a little smaller. Antenna 
long and slender, cylindrical; apex bluntand without distinct sense pegs or setae. Mandible 
small, with a large conical dorsal tooth and a single flattened ventral tooth in addition 
to apical point; prostheca distinct. Maxilla small; palpi large, cylindrical, truncated at 
apex and with a circular auditory plate near end; inner lobe of maxilla with abundant elon- 
gate setae. 
Pupa— Length, 42-45 mm. 
Length of longest breathing horn, 18-19 mm. additional. 
Width, d.-s., 3 mm. 
Depth, d.-y., 4.2 mm. 
Color dark brown; pronotal breathing horns paler at tips; mesonotum chestnut brown; 
abdominal segments indistinctly ringed with pale and darker. 
Front between antennal bases swollen, finely tuberculate but without distinct setae. 
Antenna very short, ending opposite tips of maxillary palpi. Labrum large. Sheaths of 
maxillary palpi not recurved at tips. Mesonotum unarmed, with fine transverse wrinkles. 
Pronotal breathing horns (Plate LX X XIX,491) very long and slender, the right one, at least, 
exceedingly elongate, with tip expanded. (The left breathing horn was broken before the 
apex in both the pupae studied; it was almost as long as the right horn, and may, of course, 
have been longer.) Wing pads reaching end of second abdominal segment; characteristic 
venation of genus showing clearly on sheath. Leg sheaths long, extending to beyond mid- 
length of fourth abdominal segment; fore legs shorter than the others. : 
Abdomen elongate. Abdominal segments 2 to 7 near posterior margin with a transverse 
row of short, stout spines which are interrupted only near pleura; pleural area with four 
or five spines; ventral and dorsal segments with numerous spines; dorsal row of spines more 
distant from posterior margin of segment than the other areas; dorsum of eighth segment 
with four powerful, chitinized lobes directed dorsad and caudad; posterior margin of these 
lobes with about five or six small teeth; two spines near base of pleural region on segment 8. 
Male cauda consisting of two blunt sheaths, lying between posterior pair of lobes described 
above. 
Larva.— South Mountains, near Myersville, Maryland, November 6, 1916. 
Neanotype.— Tallulah Falls, Georgia, June 17, 1910. 
Paratype— Cabin John Bridge, Maryland, May 31, 1900. 
