3. "It shows considerable individual variability, both as to time and manner of its response to stimuli." 4. After emergence, the first reactions are associated simply with the discomfort of the hardening of the tissues. 5. It has marked curiosity, as shown by its repeated inspection of its nest and other familiar objects. 6. The "home instinct" seems to be slight when the wasp is alone, but becomes stronger when two or more are on the same nest. 7. The olfactory sense is closely associated with the early instincts of the wasp. FOOTNOTES: [Footnote A: Minnie Marie Enteman. "Some Observations on the Behavior of the Social Wasps." Pop. Sci. Mo., 61: 339-351, 1902.] The Biology of the North American Crane-Flies (Tipulidæ, Diptera) V. The Genus Dicranoptycha Osten Sacken BY CHARLES P. ALEXANDER, Ph.D. (Cornell) GENERIC DIAGNOSIS _Larva._ Form very elongate, terete; integument smooth, glassy, transparent; abdominal segments two to eight with a basal transverse band or area of microscopic chitinized points on the ventral surface; segment eight with a similar band on the dorsum. Spiracular disk surrounded by four lobes, the lateral pair more slender than the blunt ventral pair; dorsal lobe very low or lacking; spiracles small, widely separated; a triangular brown mark on the disk between the spiracles; anal gills a fleshy protuberant ring surrounding the anus. Head-capsule compact, massive, the præfrons large with a few marginal punctures; externo-lateral plates very broad. Labrum large, flattened, pale; antennæ two-segmented, the apical segment almost as long as the basal segment, narrowed to the blunt tip; mandibles with a blunt dorsal and two blunt ventral teeth; maxillæ generalized in structure; hypopharynx a rounded cushion; mentum deeply split behind but not completely divided, with three principle teeth and a small lateral tooth on either side. _Pupa._ Cephalic crest low, depressed, setiferous; labrum tumid; labial lobes oval, contiguous; antennal sheaths ending opposite the base of the wing. Pronotal breathing-horns microscopic, represented only by tiny triangular tubercles; mesonotum unarmed; wing-sheaths ending opposite the middle of the third abdominal segment; leg-sheaths ending opposite the base of the fifth abdominal segment, the tarsi terminating on a level, or nearly so. Abdominal tergites and sternites each with four transverse rows of microscopic setæ; lateral spiracles on segments two to seven. DISCUSSION OF THE GENUS