. Bulletin - United States National Museum. Science. COLLEMBOLA OF THE FAMILY ISOTOMIDAE 109 simple sensory setae. There are usually 4 long setae on the fourth and on the fifth abdominal segment, and 8 or 10 on the sixth; 1 or 2 long lateral setae on the mesothorax and metathorax, respectively, and one such seta on each of the first three abdominal segments. Length, mm (3 mm. Renter). Remarks.—At the time of maldng the original description of macnamarai I had not found the postantennal organs, owing to their unusual position. For a full figure of tliis species see Folsom, 1918. In view of
. Bulletin - United States National Museum. Science. COLLEMBOLA OF THE FAMILY ISOTOMIDAE 109 simple sensory setae. There are usually 4 long setae on the fourth and on the fifth abdominal segment, and 8 or 10 on the sixth; 1 or 2 long lateral setae on the mesothorax and metathorax, respectively, and one such seta on each of the first three abdominal segments. Length, mm (3 mm. Renter). Remarks.—At the time of maldng the original description of macnamarai I had not found the postantennal organs, owing to their unusual position. For a full figure of tliis species see Folsom, 1918. In view of Axelson's revision of the description of grandiceps Renter, I regard macnamarai Folsom as synonymous with that species. According to Charles Macnamara, "This species seems to be con- fined to wooded swamps; I have never seen it elsewhere; and it some- times comes out on the snow in small numbers. This is the only pugnacious springtail I have ever observed. It almost always attacks an Achorutes put in the same vial with it and sometimes kiUs ; The specimens from Ilhnois were taken in the frozen leaf stratum, under snow. Distribution.—European writers have recorded this species from Russia, Siberia, and Alaska. Massachusetts. Framingham, C. A. Frost (according to Mr. Macnamara). Illinois: Urbana, February 2, I. H. Blake. Alaska: St. Lawrence Island, Vega Expedition. Canada: Arnprior, Ontario, December 5, 7, 21, January S, 15, 26, February, March 21, April, C. Macnamara. ISOTOMA (ISOTOMA) VIRIDIS Bourlet. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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