64 2 rcnis. Acad, uf S(. Luuis 



so like .V. monodonta as to docoive cvoii an cxporienccvl 

 eye. 



Spilowjfid quadnfasciatd Say. [C. T. Groono]. This 

 wasp-likt' fly was taken wliile at rest in the crcvico of a 

 tree at AVickos, Octohor l.*5, 1!)lM). It h)()ks so iinicli like 

 Odipurus foramiuatus that one would at onco sup^p^est 

 protoctivo luimicry, exceptiiiic for the fact that in all 

 prohahility the two species do not appear at the same 

 time in the season. 



Chironomus tcntans F. [J. ^f. Aldrich]. At twilight at 

 Creve Coeiir I^ake, many hundreds of these flies were 

 seen flyin<^ from the lake toward the shore. Earlier in 

 the afternoon a beetle, Ciciudcla rrpanda [II. S. Barber], 

 was found preying upon this fly. 



Chironomus sp. [C. T. Greene]. Over a little stream 

 in Tower Grove Park, three groups of these mosquito- 

 like flies were seen dancing at dusk, on March 'JO, 1921. 

 One swann was near a foot-bridge, two feet above the 

 water, and the other two groups were about eight feet 

 above the ground. Each group comprised a hundred or 

 more insects. They hovered or poised in the air without 

 changing their positions, witii their heads all pointing 

 southward for many minutes at a time; then for a time 

 they would change to another form of maneuvering, danc- 

 ing in and out, up and down, facing in various directions. 

 In a short time, however, they always resumed the for- 

 mer behavior. Out of the grouj) a mated couple would 

 occasionally dash away and escape, but darkness was 

 falling so fast that I failed to ascertain from which type 

 of dance the mating occurred. 



The gnats and midges of this family bear great gen- 

 eral resemblence to the Culicidae. Sharp says,* "They 

 occur in enormous numbers, and frecpiently form dancing 

 swarms in the neighborhood of the waters they live in." 



Tahauus lincula Fabr. [ F. Knab]. Found dead in the 



•Insects, IM. II. p. 4C8. 



