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; lateral lobes short, 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, a transverse row of four long, coarse setae. 



Head capsule (Plate XLVI, 215) very long and narrow, the dorsal plate slender, at end 

 expanded into a spatula; lateral plates a little shorter than dorsal plate. Labrum (Plate 

 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 region 

 with four setae, posterior pair a little the closer together; a few tiny papillae on ventral 

 surface; clypeal region emarginate, with two large setae near anterior margin and another 

 immediately behind base of antenna. Mental region not readily distinguishable in the 

 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 about 

 two or , three long setae and a very long, hyaline, sensory papilla which tapers gradually to 

 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 receive 

 mandible in a position of rest; blade of mandible produced into a very slender hook which 

 is almost straight, a little curved at extreme tip, at its base a very large, acute, flattened 

 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 the 

 mandible in length, and an additional shorter, flattened blade marked with parallel grooved 



