864 CHARLES PauL ALEXANDER 
Limnophila (Lasiomastix) macrocera (Say) 
1823 Limnobia macrocera Say. Journ. Acad. Nat. Sci Phila., vol. 3, p. 20. 
Iimnophila macrocera is a common swamp-inhabiting crane-fly, the 
larvae living in organic mud. At Orono, Maine, the writer found larvae 
of this species associated with larvae of Bittacomorpha clavipes, Pilaria 
tenuipes, P. recondita, Erioptera chlorophylla, and other crane-flies, as 
well as with leeches, snails, worms of many kinds, and other forms of 
life. The larva is similar to that of other related species. When placed 
in water it is very active and has the habit of darting the anterior quarter 
of its body from one side to the other, suggesting the striking of a reptile. 
The pupal duration is not more than eight days (June 24 to July 2, June 
28 to July 6). 
Larva.— Length, 14.5-15 mm. 
Diameter, 1.4 mm. 
Coloration, pale yellowish white. 
Body terete, narrowed toward both ends but more noticeably toward anterior end. 
Integument covered with a dense appressed pubescence. Chaetotaxy as follows: two stout 
setae on both dorsal and ventral margins of prothoracic orifice; thorax with pencils of stiff 
setae near anterior margins of segments, two large lateral tufts and a smaller ventral pair; 
abdominal segments with a pencil of similar bristles on ventro-lateral margins, one on 
anterior half, the other midlength, of each ring; a seta at posterior lateral angles of sternites; 
four setae ina transverse row near posterior margin of tergites, the lateral pair the larger; 
lateral margins of cauda near base of lateral lobes and above gills with pencils of blackish 
setae; basal part of segments on both sternum and tergum with transverse parallel rows of 
fine scabrous points, this area very narrow on second abdominal segment, consisting only 
of three or four rows, the areas gradually becoming broader and the rows more numerous, 
there being on sixth and seventh segments about 28 to 30 rows which occupy nearly the 
basal third of segments. i 
Spiracular disk (Plate XLIV, 208) surrounded by four lobes; ventral pair the longest, lateral 
pair a little shorter; ventral lobes near tips with a brush of delicate, exceedingly long hairs 
which curl into loops at tips, the longest of these hairs about twice length of lobes bearing 
them; this fringe of hairs continuous around disk, longest at ends of lobes, gradually shortened 
toward their bases but not interrupted; lateral lobes with terminal hairs a little shorter but 
still longer than lobes themselves; inner faces of lobes delicately margined with dark brown, © 
those of ventral lobes having the outer lateral margins the broadest. Spiracles rather small, 
located at base of lateral lobes. Anal gills four, very stout and plump. 
Head capsule with a framework of long, slender plates, as is usual in this group. Labrum 
(Plate XLIV, 205) broadly transverse; anterior margin irregularly rounded; anterior median 
area truncated, with the lateral angles slightly projecting, cut off squarely, each with a small, 
hyaline, sensory papilla; laterad and caudad of each, two sensory papillae, the innermost 
elongate-cylindrical, more than twice length of short, oval, outer one. Epipharyngeal 
