Larva a medium sized plumosus-type. Mentum (Fig. c)with somewhat rounded teeth; centre tooth quite broad with short diverging sides then rounded, c2 teeth moderately separated (type I - II); 4th laterals reduced about to the level of the 5th laterals (type II). Ventromental plates (Fig. d) with about 41 - 44 striae; separated by about 0.32 - 0.35 of mentum width. Pectin epipharyngis (Fig. a) with about 12 relatively short, blunt teeth. Antenna (Fig. b) with basal segment about 2.8 - 3.3 times as long as wide; AR about 1.9; antennal segments 150 : 37 : 12 : 13 : 8 micron; ring organ from one third to one half up from bottom of basal segment. Mandible (Fig. e) with 3rd inner tooth lightly coloured and partially separated (type II); about 19 - 22 striae near base; and 2 or 3 spines on inner surface.
Cytology: 4 pairs of relatively short chromosomes with the thummi arm combination AB, CD, EF, G. Arm G short and generally paired only at the virtually terminal nucleolus, often end-to-end. No nucleoli in the longer chromosomes. Puff (groups 7-8) in arm B with distal dark bands near end of arm. Since the larvae are known only from a single egg mass, it is not possible to say whether inversion polymorphism occurs.
Click here for the polytene chromosomes.
Found: Alberta - Huntington Hills, Calgary.