876 CHARLES PAUL ALEXANDER 



slender points. Antenna short in both sexes. Pronotal breathing horns (Plate L, 238) 

 moderately elongate, cylindrical, transversely wrinkled, at tips smooth, flattened, and 

 slightly enlarged. A tubercle with two long setae above wing axil. Two satiferous punctures 

 on dorsum on either side of median line. Wing sheaths ending before tip of second abdominal 

 segment. Leg sheaths ending before tip of third abdominal segment, the tarsal sheaths 

 ending about on a level or the hind legs shorter. 



Abdominal segments with tergites (Plate L, 239) 2 to 6 provided with eight naked, 

 discal tubercles, arranged in four transverse pairs, the third pair more approximated; laterad 

 of third pair of naked tubercles, two small setiferous tubercles; on seventh segment one of the 

 four pairs of tubercles lacking; near caudal margin of segments a transverse row of weak, 

 setiferous tubercles; on either side of median line, in alinement with discal tubercles and 

 just anterior to the transverse setiferous row, a large tubercle provided with three setae. 

 Pleural region carinate, each segment armed with four slightly curved tubercles: anterior 

 one solitary, setiferous; sacond one solitary, nakad; third one with two or three setae; posterior 

 one bifid, naked. Sternites (Plate L, 240) with six naked, discal tubercles corresponding 

 to those of tergites but reduced in number. Subterminal armature weak, ends of rows 

 tuberculate; an isolated setiferous tubercle ventrad and laterad of ends of rows. Male 

 cauda (Plate L, 242) elongate; dorsal lobes elongate-cylindrical, directed caudad and 

 slightly dors^i, tapering to acute tips; three weak setae on outer ventral face; ventral lobes 

 blunt, much shorter than dorsal lobes, with a blunt median lobule between them at their 

 base; eighth segment on tergum provided with a large, blunt, median tubercle, with two 

 large posterior lobes which are directed caudad and with two tiny lobes on either side in 

 front; sternum with a transverse row of four separated setiferous tubercles; caudal margin 

 with a transverse row of about eight or nine pale tubercles on either side, the outermost the 

 largest; a small seta above second tubercle at ends of row. Female cauda (Plate L, 

 241) very long and slender, subacicular, sternal valves a little shorter than tergal valves; 

 tergal valves terminating in blunt cylindrical points. 



Neanotype. Male pupal skin, Ithaca, New York, June 3, 1917. 

 Paratypes. Pupa, a male skin with type pupa; a female skin, Ithaca. 



Subtribe Hexatomaria 



The subtribe Hexatomaria comprises a well-defined division with but 

 four known genera, three of which are North American and are considered 

 in this paper. The only other group of crane-flies with which the species 

 may be confused are certain of the Limnophilaria, especially the Ulomorpha 

 group of genera. 



The larvae havo the labral sclerite of the head capsule large, separated 

 from the remainder of the capsule by a distinct suture. The epipharyngeal 

 region is restricted to the anterior median part of the sclerite, and is pro- 

 vided with two large tubercles on either side, which are tipped with two 

 or ^.hree hyaline, cylindrical papillae. Between these papillae is a brush 



