Species 3h. C. decorus-group sp. 3h.

Adult

Pupa:  Not known.

Larva a medium sized (13.7 - 16.3 mm) plumosus-type; lateral tubules about 240 - 360 µm.  Ventral tubules moderately long and about equal length (ant. 1.34 - 2.56 mm; post. 1.98 - 2.44 mm).  Anal tubules about 2 - 2.5 times longer than wide, (len. 330 - 480 µm), without a constriction, ventral pair tending to be longer but narrower.Gular region dark on posterior half, frontoclypeus generally pale, but may be slightly darkened.
Mentum ( Fig. c) with somewhat rounded teeth; c1 tooth relatively narrow, top sometimes rounded; c2 teeth moderately separated (probably type III if not worn); 4th laterals generally not reduced (type I-II).
Ventromental plates ( Fig. d & c) separated by about a third of mentum width, about 43 - 46 striae reaching about half way to anterior margin; VMR about 0.33.Pecten epipharyngis ( Fig. a) with about 12 - 15 relatively broad teeth (type C).  Premandible with inner tooth slightly longer and about 2.5 times the width of the outer tooth.
Antenna ( Fig. b) with Ring organ between a third and half way up A1; AR about 2.0 - 2.4; A1 about 3.4-4.3 times longer than wide, relative length of segments (µm) 152 : 34 : 10 : 14 : 7.
Mandible ( Fig. e) with third inner tooth moderately separated but pale (type IIB); pecten mandibularis with about 10 - 14 bristles; about 14 - 17 furrows on outer surface at the base.

Cytology:  4 polytene chromosomes with the thummi arm combination AB, CD, EF, G.
Arm G relatively short and thick with a sub-terminal nucleolus, probably in terminal heterochromatic cap, and a BR near the center, followed by a definite constriction and dark bands; commonly only paired at the nucleolus.  Arm B may have a nucleolus just near the center of the arm, also with a bulb (group 7?) near the end of the arm with some dark bands proximal.

Found: New Brunswick - Kouchibouguac National Park (48.8583°N; 64.9750°W).
            Ontario - ¿South March nr. Mud Lake (44.88°N, 78.27°W), Carleton Co.

            Pools and rivers.

Appears to show relationship to C. sp. u.