Specimens, including rearings, in the collection of J.E. Sublette, now in the Zoological Museum of the University of Minnesota, St. Paul.
Pupa: Caudolateral spur of segment VIII with about one spine.
Fourth instar larva a small to medium thummi-type (Fem. 13.1-14.3 mm; Male abt 11 mm) with ventral tubules relatively short, about equal length or posterior pair longer (ant. 0.7-1.2 mm; post.0.8-1.3 mm). Gular region and frontoclypeus pale or gula may be slightly darkened.
Mentum (Fig. d)with generally sharp teeth; c1 tooth narrow, almost as long as first laterals, c2 teeth well formed and separated (type III); 4th laterals not reduced (type I).
Pecten epipharyngis (Fig. a)with about 12 somewhat irregular sharp teeth. Teeth of premandible (Fig. c)about equal length.
Antenna (Fig. b) with basal segment about 5 times longer than wide, Ring organ about 0.4 up from base; AR about 2.
Distance between antennal bases greater than that between S4 setae.
Mandible (Fig. e)with 3rd inner tooth separated and darkened (type II-IIIB), about 14-16 furrows on outer surface near base.
Cytology: 4 polytene chromosomes with the pseudothummi arm combination AE, BF, CD, G. Chromosomes relatively short and often with sections unpaired.
Arm G generally unpaired or may be paired at the subterminal nucleolus and submedian Balbiani ring (BR); but occasionally fully paired as in figure. Centromere heterochromatic, arm often constricted between the nucleolus and BR. No nucleoli in the long chromosomes and centromeres not markedly heterochromatic. No polymorphism in specimens examined.
Found: Ontario - Glen Tay.
Snow melt pools.
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