96 .Bulletin of the Brooklyn Entomological Society Vol. XV 



all water-breathing beetle larvae, all water-breathing Chironom- 

 idse, Corethridse, and Psychodidse, etc.) 



c. Atmospheric air — goes into solution in water — passes 

 through membrane — is fixed by blood — passes through tracheal 

 walls — out of solution in lumina of trachese — into solution in cell 

 cytoplasm. (All holaquatic Diptera, and probably Trichoptera.) 



d. Atmospheric air — goes into solution in water — passes 

 through body wall — is fixed by blood — carried by blood to tissues 

 — out of solution in cell cytoplasm. ( ? Some Chironomidse larvae. 

 Hydrachnida?.) 



We have here a progressive order of complexity, wherein the 

 tracheal method tends to persist, but is finally dropped. Many 

 Chironomidse that have the fixation method well developed also 

 show an elaborate tracheation. Others again show mere ves- 

 tiges of trachese. In the latter it seems rather probable that the 

 respiration is similar to that of other non-tracheate Arthropoda, 

 i.e., the tissues are bathed directly by the blood and the tissues 

 extract their oxygen supply from the blood as they need it. Still 

 more confusing is the fact that in so many Chironomidse without 

 trachese, or only with vestigies, there is no visible carrier. 



As an appendix to this section I would note certain fila- 

 mentous structures which do not contain trachese, but which 

 seem to act as respiratory organs and which connect up with 

 trachese. Such are the gill filaments in the larvse of the water- 

 penny Psephenus, in caddisworms, the dorsal tufts in the pupse 

 of Simulium and Psychodidse. 



{Continued in December Bulletin.) 



DISTRIBUTIONAL NOTE ON TWO SPECIES OF 

 COLEOPTERA. 



By H. M. Parshley, Smith College, Northampton, Mass. 



In view of the forthcoming Catalogue of North American 

 Coleoptera in preparation by Leng, I would place on record the 

 following data. 



