504 PROCEEbiNGS OF TEE NATIONAL MVSEVM. vol.50. 



fluent dorsally, distinct ventrally; sense-organ of tliird segment as in 

 figure 200; subapical sense-organ of fourth segment large, trilobed. 

 Unguis (fig. 201) slender, unidcntate a little behind the middle of the 

 inner margin or untoothed. One tenent hair, unknobbed. Clothing 

 of abundant closely set setae (fig. 202) the larger setae denticulate. 

 Length, 3 mm. 



In 1898 I sent Massachusetts examples of this species to Dr. 

 Caesar Schaffer, who reported that they agreed with European 

 specimens of Anurida maritima. 



Anurida maritima is strictly a maritime species. It occurs abun- 

 dantly on the seashore chiefly between tide marks, and at low tide 

 may be seen crawling about on rocks, sa,nd, seaweed, driftwood, etc., 

 and feeding on dead mollusks or crustaceans. As the tide rises the 

 insects burrow into the sand or crawl into crevices in rocks or other 

 objects, and become submerged; the hairy clothing retaining a 

 supply of air sufficient to enable these insects to sm-vive under water 

 until the tide falls ; or even for several days if necessary. 



This coUembolan, a most serviceable species for investigation, has 

 been the subject of an important monograph by Imms ('06). 



In Europe, Anurida maritima has been reported from Sweden, Den- 

 mark, Germany, HoUand, Belgium, France, and Great Britain. In 

 this country it is a common species along the Atlantic coast. 



Massachusetts. — Salem, A. S. Packard, jr. (M. C. Z.). Boston, 

 July 28, August 3, 4, 8, 10, 11, 20, 25, September 1, October 20. 

 Neponset, May 4, October 10, 20, November 20. Duxbury, Septem- 

 ber 27, J. J. Skidmore. Buzzards Bay, J. E. Todd (M. C. Z.). Woods 

 Hole, A. M. Claypole. Nantucket, A. S. Packard, jr. (M. C. Z.). 



New York. — Cold Spring Harbor, Long Island, C. B. Davenport. 



New Jersey. — ^A. E. Verrill. 



Florida. — E. Lonnberg. 



ANURIDA TULLBERGI SchStt. 



Plate 22, figs. 203-205. 



Anurida tuUbergi Schott, 1891a, 1894a, 18946, 1902.— MacGillivray, 1894.— 

 Reuter, 1895. — ScHAFFER, 1896. — Lie-Pettersen, 1898. — Scherbakov, 

 1898.— BoRNER, 1901c?.— Carl, 1901.— Agren, 1903.— Guthrie, 1903.— 

 AxELSON, 1905a. — (Axelson) Linnaniemi, 1907, 1912. 



Bluish black above, gray beneath; pigment in flecks or in a net- 

 work on a yellowish-white ground. Eyes five on each side. Post- 

 antennal organ (fig. 203) with 17 to 30 (commonly 20 or 21) peripheral 

 tubercles arranged in a more or less irregular eUipse. Fourth antennal 

 segment with a dorsal subapical trilobed sense-organ, and with five 

 olfactory hairs (fig. 204) as follows: Two outer, one upper, and one 

 inner, and between the two outer a fifth hair one-third as long as the 

 others. Third antennal segment with one distal dorsal olfactory 



