870 CHARLES PauL ALEXANDER 
rank vegetation in such haunts. The flies bear a marked resemblance 
to the species of the subgenus Lasiomastix of the genus Limnophila, but 
the pupae, especially in the structure of the pronotal breathing horns, 
are quite distinct. The larvae are different from the related and some- 
what similar larvae of the subgenus Dicranophragma of the genus Lim- 
nophila, of Penthoptera, and of similar hexatomine genera, in their pale 
whitish yellow coloration instead of the deep saturated yellows and oranges 
of the genera mentioned. All, however, have the quick, restless move- 
ments so characteristic of this group of crane-flies. Larvae found on 
Bool’s hillside, Ithaca, New York, on May 14 and 23, 1917, transformed 
to adults on June 9. 
Larva.— Length, 8.5-9 mm. 
Diameter, 0.5-0.6 mm. 
Coloration pale whitish yellow, the eighth abdominal segment suddenly whitish. 
Form slender. Body covered with a dense golden-yellow pubescence. A transverse fringe 
of stiff, erect, short hairs at posterior margin of prothorax. A number of pencils of setae 
or solitary bristles on sides of segments, one on each annulus, longest near posterior margins 
of segments. Behind these setae, tufts of small hairs. Spiracular disk (Plate XLVI, 
219) surrounded by four lobes; ventral pair the longest, lying subparallel to each other, 
outer margin fringed with long, delicate hairs, those near tip coarse and easily broken, some 
of the hairs at tips exceedingly elongate; inner face of ventral lobes heavily suffused with dark 
brown, this color more intense proximally; laterai lobes snort, with an apical fringe of coarse 
yellowish setae. Spiracles very small, widely separated, located at base of lateral lobes. 
Anal gills four, very slender, pale in color, the posterior pair a little the longer. On sternum 
of eighth abdominal segment, before gills, 2 transverse row of four long, coarse setae. 
Head capsule (Plate XLVI, 215) very long and narrow, the dorsal plate slender, at en 
expanded into a spatula; lateral plates a little shorter than dorsal plate. Labrum (Plat 
XLVI, 216) and epipharynx broadly transverse, projecting, the anterior margin narrower, 
truncated, on either side near base with a brush of long hairs; disk of epipharyngeal regio 
with four setae, posterior pair a little the closer together; a few tiny papillae on ventr 
surface; clypeal region emarginate, with two large setae near anterior margin and anothe 
immediately behind base of antenna. Mental region not readily distinguishable in th 
material available, but at the most with little or no chitinization. Antenna (Plate XLVI 
217) with basal segment cylindrical, a little narrowed medially, the truncated apex with abou 
two or three long setae and a very long, hyaline, sensory papilla which tapers gradually t 
apex, this papilla about three times length of segment bearing it. Mandible (Plate XLVI 
218) hinged, the base slender but powerful, with the inner face deeply concave to receiv 
mandible in a position of rest; blade of mandible produced into a very slender hook whie 
is almost straight, a little curved at extreme tip, at its base a very large, acute, flatten 
blade which is more than half length of mandible itself; in its angle this blade has a second 
microscopic, tooth; prostheca with about five long, stout, comblike teeth exceeding th 
mandible in length, and an additional shorter, flattened blade marked with parallel groov: 
