Mystery Midges:

• Chironomus? (pale) (Bohdan Bilyj's comment: "Chironomus? is probably Camptochironomus pallidivittatus There is a fig.27 in Shilova (1991) that comes closer (than the one drawn in the Holarctic key) to your mentum with a broadly rounded median tooth.)
  
• Orthocladiinae sp.2
  • Bohdan Bilyj's comment: "Orthoclad 2 . This one could be a Parakieffeiella. I've seen that kind of squared off median tooth in some of my species. Also the VM plates can project upwards thus obscuring the lateral teeth."
  • Øyvind Schnell's comment: "I have found many 4. instar larvae of your "Orthocladiinae sp. 2". They were sampled in the littoral zone (< 1 m depth) of a small lake in the middle part (63o N) of Norway. The lake is situated at 1050 m a.s.l. close to the coast, and is strongly oligotrophic, the surroundings looking almost arctic. Neither I nor Ole were able to identify them even to the genus level, and we agreed that a new genus most likely must be erected to accommodate them. The larva has strong setal tufts on the body as in Cricotopus, coarsely plumose SI-setae almost like Hydrobaenus, 4 inner teeth on the mandible, but are otherwise quite similar to Orthocladius. I will visit the lake this summer and try to find pupae/adults for a complete description of the species.
    
• Orthocladiinae sp.4 (Bohdan Bilyj's comment: "Orthoclad. 4 . This one is somewhere between Parasmittia and Smittia. My bet it's one of the aquatic forms of Smittia. There is a fig.195 in Pankratova (1979) of S. aquatilis that comes close to your mentum.")
  
• Podonominae? sp.1 (I originally thought this was an orthoclad - but Peter Cranston thinks it may be one of the Podonominae. Any other opinions?)
  • Bohdan Bilyj's comment: "Podonominae. Well I'm not so sure it belongs to that subfamily. My guess it's Euorthocladius. Check out fig.168 in Oliver et al. (1978). Note the 7 lateral teeth, although the medial three are somewhat reduced in your specimen."
    
• Unknown Fragment #4
  • John Epler's comment: "I would wager your unknown fragment #4 is either
    a larval beetle or trichop mandible."
  • Bob Saunders comment: "It looks quite similar to the mandible of a Perlidae or Perlodidae, except that those stoneflies usually have more setae along the edge."
  • Rob Rumes comment: "The Unknown fragment #4 ... is probably a mandible of a Trichopteran larvae. It looks somewhat squashed but resembles Trichopteran mandibles which i found in sediments of Ugandan Carater lakes (see attachment). See also Merrit and Cummins's Introduction to the aquatic insects of North America chapter 15 (specificaly pgs. 319 and 329) and The use of Caddisflies (Trichoptera) in paleoecology by N.E. Williams."
    
    
    
    

Click on the links below to help people with the identification of some unidentified midges

1. from Alexander Klink
2. from Donna Francis
3. from Jack Zloty
4. from Erin Barley No. 1
5. from Erin Barley No. 2