Thorax dark brown; abdominal segments entirely light brown without dark bands or other markings.
Hypopygium illustrated by White & Ramsey (2015). Superior volsella about twice as long as in C. plumosus. Gonostyle swollen just beyond half way, then narrowing sharply.
Pupa: Not described.
Fourth instar larva of type series of halophilus type, but most other reports refer to a salinarius type. Where ventral tubules present the anterior pair are 1.04-1.11 mm long, generally shorter than the posterior pair which are 1.09-1.11 mm long. Details of anal tubules are available only for the halophilus-type larvae, where they are about 567-784 µm long and about 2.2-3.1 times longer than wide. Very large species, length listed as from 30 mm to over 50 mm (Epler 2001)
Gula darkened on posterior half to two thirds, wider than mentum and extending up to margin on either side of the mentum, frontoclypeus pale. Oesophageal aperture (Fig. b) about 2.18 times longer than wide.
Mentum (Fig.e) with 4th laterals reduced at least to level of 5th laterals (type II); central tooth relatively broad with c2 teeth relatively well separated (type IIA).
Ventromentum (Fig.f) about 3.65-3.75 times longer than deep, but only about 0.90-0.96 of the mentum width and separated by about 0.42 (0.38-0.49) of mentum width, about 48.5 (41-68) striae, VMR 0.31-0.32.
Pecten epipharyngis (Fig.a) with about 12.6 (10-15) broad (type B), often somewhat irregular due to wear, teeth. Premandible (Fig.d) with inner tooth about 2.0-2.8 times the width of the outer tooth.
Distance between antennal bases greater than that between the S4 setae, which are separated by about 0.75 of mentum width at that point.
Antenna (Fig.c): Segment 1 relatively long: (2.11-3.07) times longer than wide; A2/A1 about 0.18-0.24; AR about 2.22-3.01; ratio of segments (µm) 173 : 38 : 9 : 14 : 8.
Mandible (Fig.g) with third inner tooth often only partly separated and partially colored but may be completely separated and dark (type IIB-IIIA), about 25 (21-31) furrows on outer surface near the base, 10-13 taeniae in the Pecten mandibularis.
Cytology: 3 polytene chromosomes with a modified thummi arm combination AB, CD, GEF.
Centromeres heterochromatic and may have a large vacuolated region and may form a chromocenter.
No nucleolus in arm G, only nucleolus in arm A. Two Balbiani rings (BRs) in arm G region.
Arm B sometimes shows a bulb (group 7) with distal dark bands near distal end.
No polymorphism in studied specimens.
mgsA1: 1 - 2c, 10 - 12, 3 - 2d, 9 - 4, 13 - 19; i.e. as in holomelas, cucini & tardus.
mgsB1: Puff and distal dark bands (groups 7-8) near distal end. Differs from tardusB1 by small inversion just distal to middle of arm.
mgsC1: Differs from neocoraxC1 by small distal inversion.
mgsD1: Differs from cucD1 by small distal inversion.
mgsE1: 13a - 10c, 3f - 4, 10b - 5, 3e - 1, 13b - g
mgsF1: 1 - 10, 17 - 11, 18 - 23; i.e. as in aberratus, cucini, tardus & tenuistylus.
mgsG1: Fused to arm E, with two BRs in middle of the arm.
Found: Alabama - locality not recorded.
Georgia - 5 ml w. Athens (33.97°N,83.50°W), Clarke Co. (Type locality); Lake Sinclair, nr. Milledgeville, Putnam Co.; Lawrenceville,
Gwinnett Co.; Lullwater Lake, nr. Atlanta, Dekalb Co.
Kentucky - Kentucky Lake, Livingston Co. (Balco et al. 2004).
Ohio - Buckey Lake, Perry Co. (Bolton 2012).
Oklahoma - Lake Texoma, Buncombe Creek Cove, Marshall Co.
Tennesee - Reelfoot Lake, Lake Co. (Epler 2001)
Lakes and ponds in southern U.S.A.
Larva and cytology described by Wülker and Butler (1983), some information on arm F given in Fig. 3 of Martin (1979). Some morphological information also given by Epler (2001).