Setae: achrostichal 18; dorsocentral 26 - 30; prealar 5 - 6; scutellar 22.5 - 6 setae on anal tergite.Pupa: Not known.
Fourth instar larva of the plumosus-type, larger than larva of C. longistylus. Gular region completely dark, frontoclypeus with dark stripe and antennal pedicel darkened as in C. utahensis, ring organ about 0.4 of the distance from the base of antennal segment 1.
Cytology:4 polytene chromosomes with the thummi arm combination AB, CD, EF, G.
Arm G frequently paired in the constricted region, nucleolus at this end with a large Balbiani ring near the opposite end but separated from it by dark bands. No nucleoli in other chromosomes.
Although polymorphism in arms A and B is known in Europe, no polymorphism has been recorded in North America.
tstA1: 1-2c, 10-12, 3-2d, 9-4, 13-19; i.e as holomelas, longistylus, etc.
tstB1:
tstC1: 1-6b, 11c-8, 15-11d, 6gh, 17a-16, 7d-a, 6f-c, 17b-22 i.e. as in longistylus, tardus, pilicornis
tstD1: 1-3, 11a-c, 17-12, 18a-f, 7d-4, 10-7e, 18g-24.
tstE1: 1-3e, 5-10b, 4-3f, 10c-13; i.e. as longistylus, etc.
tstF1: 1-10, 17-11, 18-23; i.e. as in cucini, major & tardus.
tstG1: Nucleolus near constriction with BR at other end.
Found: Wisconsin - Crystal Bog (Lake 27-2), Vilas Co.
Type locality - Lake Grimsgöl, Vontjarn, Southern SWEDEN
Also Finland and Norway. report from Netherlands needs checking.
Morphology and cytology described by Wülker (1991a).
[ See also C. longistylus| Return to Index| Go to References ]