822 CHARLES PauL ALEXANDER 
The following descriptions of the immature stages are adapted from 
those of Needham and Malloch: 
Larva.— Length, 10-15 mm. 
Diameter, 1.5-2 mm. 
Coloration green, with distinct brown marks on dorsum and with an interrupted mid- 
dorsal row of alternating paler dots and crossmarks; dark area made up of closely placed 
spinous hairs, clear areas for the most part devoid of hairs. 
Body cylindrical, abruptly tapering behind on last abdominal segment. Legs lacking, but 
a scurfy, pubescent creeping-fold on under surface of meso- and metathorax, a similar one on 
first abdominal segment, and much larger, transversely placed, fusiform creeping-ridges on 
ventral surface of abdominal segments 2 to 7, on anterior ring of each segment. Incisions 
between dorsal segments of abdomen margined with blackish spinules, which are slightly 
stronger than other hairs of dorsum. Spiracular disk vertically cleft, with sloping sides, 
folded together when under water, border of aperture fringed with short hairs and destitute 
of fleshy lobes. Spiracles oval. Anal gills four, fleshy. S 
Head large, similar in general appearance to that of Limnobia, entirely retractile within 
enlarged prothorax; head showing a broad, pale yellow, median band, sides black from base 
of antennae backward. Labrum transversely oval, with a margin of close-set, scurfy hairs; 
clypeus one-fourth broader than labrum, yellow, with parallel sides but emarginate on front 
for reception of labrum; three recurved, stout setae on lateral margin of clypeus on each side, 
one on each angle and two on disk. Mentum slightly convex in outline, median tooth much 
ionger and stouter than first lateral, second and third laterals as large as median tooth. 
Antenna long, the shaft about three times as long as its greatest diameter. Maxillary palpi 
short and inconspicuous. 
Pupa.— Length, 8-9 mm. 
Diameter, 1.5 mm. 
Body smooth and shiny, ends brownish. Front of thorax upcurved dorsally. Pronotal 
breathing horns broad, laterally flattened, obtuse at apex, each with a basal recurved, sharp 
hook on its dorsal side; breathing tubercles arranged in a semicircular row along obtuse tip 
of horns. Dorsum of thorax with a faint fretwork of raised lines on surface. Abdomen 
smooth, with transverse lines of scurfy pubescence, terminating in a pair of stout, sharply 
recurved hooks. 
Malloch (1915-17b, pl. 38, fig. 5) has figured the peculiar pronotal 
breathing horn of this species. 
Dicranomyia stulta O. 8. 
1859 Dicranomyia stulta O. 8. Proc. Acad. Nat. Sci. Phila., p. 210. 
Adults of Dicranomyia stulta are often exceedingly abundant, flyin 
about, or resting in close proximity to, rocky ledges or cliffs near streams 
They are found commonly in June, associated with such crane-fly specie 
