916 CHARLES PAUL ALEXANDER 



They may be swept from rich vegetation in company with such char- 

 acteristic species as Limnophila brevifurca, L. fuscovaria, L. subtenuicornis, 

 Adelphomyia minuta, Rhaphidolabina flaveola, Molophilus hirtipennis, 

 Erioptera venusta, E. stigmatica, Gonomyia florens, G. subcinerea, and 

 Tipula oropezoides. 



The elongate larvae of this fly were very common in rich organic mud 

 taken from Bool's hillside, Ithaca, New York (as discussed under the 

 account of Bittacomorphella jonesi, page 780), where they were associated 

 with a crane-fly fauna characteristic of such situations. The larvae, in 

 life, are pale yellowish, with the food contents, of a chalky white color, 

 showing thru the integument. The head capsule and the spiracular disk 

 are very small ; the inner face of each lobe of the latter is very narrowly 

 lined with black. The species was reared many times during late May 

 and early June, 1917, the length of the pupal existence indoors being seven 

 or eight days. 



Larva. Length, 10.4-11.6 ram. 

 Diameter, 0.7-0.75 mm. 



Coloration very pale yellow; contents of alimentary canal chalky white. 



Form terete, elongated, body tapering gradually to the posterior end, just beyond gills 

 (Plate LXVII, 353) suddenly constricted; last segment elongate-cylindrical, tapering gradu- 

 ally to the very small spiracular disk. Body covered with a short, appressed pubes- 

 cence, on last segment this pubescence coarser and more erect, with a few elongate hairs 

 interspersed; lateral parts of body at caudal margins of segments with short transverse 

 lines of small, erect setae; a few other similar rows at about midlength of certain of the 

 segments. Spiracular disk (Plate LXVII, 357) very small, tending to be eliminated by 

 reduction; lobes short and blunt, dorso-median lobe the smallest; ventral lobes with two 

 short brown lines, not connected distally, the proximal line a little longer than the lateral 

 line of each lobe; the pale space between these lines a little less than diameter of one; 

 lateral lobes with two similar divergent lines, the dorsal one attaining inner level of 

 spiracles; dorsal lobe with two small, indistinct, brown lines; on disk between spiracles two 

 small round spots which do not touch spiracles; lobes fringed with short hairs near tip, 

 and capable of close approximation so that disk is often entirely closed. Spiracles large, 

 nearly circular. 



Head capsule small, very long and slender, greatly dissected, the three bars of either side 

 long and delicate; dorsal bars at their articulation joined with a short longitudinal bar near 

 whose anterior end the antennae are inserted; ventral bars of capsule not conspicuously 

 expanded at their anterior end, and apparently not toothed as in other species of this genus 

 and in Molophilus. Labrum and epiphirynx long and narrow, lying between antennal 

 bases; epipharyngeal region densely clothed with short setae at tip and with two parallel 

 brushes on ventral face. Mentum apparently not formed as in E. chlorophylla, a slightly 



