THE CRANE-FLIES OF NEW YORK PART II 965 



two pairs of small filaments on basal ring, the anterior pair more widely separated, two 

 pairs of much longer filaments on posterior ring, the last pair more widely separated, longer, 

 and tipped with blackish, between them a tiny median filament. Chaetotaxy as follows: 

 tergites with four solitary setae along anterior margin of prothorax, and two setae just 

 laterad of each dorsal filament of prothorax and posterior filaments of meso- and meta thorax; 

 abdominal segments with a seta laterad of each simple and branched filament; pleurites 

 with a stiff seta at base, and out toward apices, of middle lateral filaments; sternites with a 

 group of about four stiff setae on either side of posterior ring of prosternum, and a single 

 stiff seta on either side of median line; meso- and metasternum with a lateral group of setae; 

 a seta laterad, and another at about midlength, of each of the posterior pair of ventral 

 filaments. 



Spiracular disk with ventral lobes elongate, slightly recurved, the posterior face intensely 

 blackened, chitinized, each lobe with two acute spines at tip, with two setae near them; 

 a stiff seta on side of base of each ventral lobe; dorsal lobes as already described, the rudi- 

 mentary posterior branch of last furcate dorsal filament much smaller than in ventral lobes, 

 the posterior face heavily blackened; spiracular disk rhombic in form, white, and having 

 almost the appearance of porcelain. Spiracles situated between bases of dorsal lobes. Skin 

 about spiracles capable of retraction so as to form .a deep recess. 



Head capsule rather short, almost conical, formed of two large lateral plates and a some- 

 what smaller and shorter prefrontal plate. Mentum with an outer (ectolabial) part and 

 an inner (endolabial) part; mentum a triangular or somewhat pentagonal plate, strongly 

 chitinized, fore margin with about fifteen teeth; mandibles working against teeth of both 

 endo- and ectolabia. Antenna of a single segment, bearing on its truncated apical end a 

 few sensory papillae. Mandibles small but strong, curved inward at tip and furnished with 

 a fringe of setae, which assist in closing the mouth opening. Maxilla expanded into flattened, 

 shovel-like structures, inserted high on side of head; palpus with a number of sensory papillae 

 at apex, and with a porous plate on outer side which seems to be an organ of hearing. 



Pupa. Length, 16-18 mm. (Miall gives length up to 20 mm.) 

 Width, d.-s., 2.9-3.3 mm. 

 Depth, d.-v., 2.7-2.9 mm. 



Coloration greenish brown, in alcohol a paler yellowish brown; a very broad dorso-median 

 dark brown stripe which is narrowly margined laterally with yellowish; dorsum of abdomen 

 suffused sublaterally with dusky, extreme lateral margins of body yellowish; ventral surface 

 with two broader sublateral stripes and a very narrow ventro-median stripe. 



Anterior end of body very deep and thick, as is usual in this group of crane-flies. Abdomen 

 greatly depressed, with lateral margins very thin and flattened. Cephalic crest low, non- 

 setiferous, located between antennal bases. Labrum broad basally, narrowed toward apex, 

 which is broadly rounded; two setae at base of labrum. Labial lobes subcircular in outline. 

 Maxillary palpi elongate, bent strongly backward so as to lie along flattened cheek. Antenna 

 rather elongated, extending far beyond origin of wing pad (Plate LXXXIII, 449). Thorax 

 very deep, flattened above. Pronotal breathing horns, which are broken in the writer's speci- 

 mens, seen from other descriptions to be rather elongate, almost straight, and slightly 

 divergent; two small setae between bases of breathing horns; two groups of setae on anterior 

 part of pronotum before breathing horns. Mesonotum (Plate LXXXIII, 449) with 



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