THe CRANE-FLIeEs oF NEw York — Part II 863 
Abdominal segments (Plate XLIII, 198) each divided into two rings by a false constriction, 
basal ring about two-thirds length of posterior ring. Basal ring on dorsum with a transverse 
row of about eight slender, blunt tubercles before caudal margin; on pleura a similar but 
larger tubercle opposite basal ring, this tipped with a long, delicate seta. Sternum unarmed. 
Posterior ring on dorsum with a subterminal row of blunt tubercles, simple or bifid, often 
approximated or crowded, bearing one or two long setae; near base of tergum, opposite 
spiracle, a setiferous tubercle; on pleura, opposite base of posterior ring and nearer dorsum 
than sternum, a vestigial spiracle with a double setiferous tubercle ventrad of it; near caudal 
margin of pleura two or three compound multisetose tubercles (Plate XLIII, 197) or aggre- 
gations of simple tubercles, which are largest on seventh segment. On sternum, two slender 
tubercles on either side, near base of posterior ring. Female cauda (Plate XLIII, 201) 
elongate, with the tergal valves a little longer than the sternal valves; each of tergal valves 
with a small tubercle at base. Male cauda (Plate XLIII, 199 and 200) with the ventral 
lobes blunt, the dorsal lobes a little longer and ending in an acute point; a tiny tubercle 
on either side at base of dorsal lobes. Dorsum of segment 8 with a trapezoid of four con- 
spicuous lobes ending in truncated tubercles; anterior pair of lobes smaller and a little more 
widely separated than posterior pair. 
Nepionotype.— Ithaca, New York. 
Neanotype.— Ithaca, New York, May 31, 1917. No. 57-1917. 
Paratypes.— Pupal skins, June 11, 1917 (No. 99-1917), June 16, 1917 (No. 132-1917). 
Abundant larvae, with nepionotype. 
(Subgenus Lasiomastix Osten Sacken) 
1859 Lasiomastiz O.S. Proc. Acad. Nat. Sci. Phila., p. 233. 
Larva.— Body slender, with pencils of stiff setae on lateral margins of thorax. Spiracular 
disk with four lobes, the ventral pair a little the longer and bearing a fringe of long, delicate 
hairs, these about twice length of lobes. Anal gills short and stout. Head capsule of 
hexatomine type. Mandible powerful, cutting edge with a single row of three or four 
flattened, bladelike teeth. Maxilla very long and slender. Antenna elongate, at tip with 
a small elongate-oval papilla whose surface is delicately sculptured. Mentum chitinized, 
a strong transverse bar which is ribbed with fine parallel grooves. 
Pupa.— Cephalic crest very small, inconspicuous, bilobed. Pronotal breathing horns 
short, broad, somewhat compressed, a little pointed at apex. Mesonotum unarmed. 
Abdominal segments depressed, armed with numerous tubercles or small spines, these being 
most abundant on posterior annuli of segments. 
The subgenus Lasiomastix includes but six known species, three of 
which are from eastern North America. Limnophila (Lasiomastix) 
macrocera is common and widely distributed thruout the Eastern States. 
L. (L.) tenuicornis O. 8. and L. (L.) subtenuicornis (Alex.) are found only 
in the Northeastern States and are more local in their distribution. The 
immature stages of L. (L.) macrocera are spent in rich organic mud. They 
are very similar to those of the subgenus Phylidorea. 
