JOUBNAIi OF ENTOMOLOGY AND ZOOLOGY 153 



Description: Length — 3.8-5 mm. Color — "Dirty," obscure 

 purple above, shading down laterally to a lighter tint, and 

 showing brownish purple beneath. The antennae are dark 

 purple throughout; the legs rather a weak piirple. The dentes 

 and sometimes the legs as well, show a tendency to a yellow 

 green tint. The head is dark throughout. Antennae — Longer 

 than the head; IV much more slender than III, I short and 

 stout; II, III and IV subequal. Ocelli — Sixteen. Claws — 

 Superior, long, curving but slightly, armed. One outer and 

 two inner teetli; inferior, short, armed with one inner tooth; 

 no tenent liairs. Furcula — Dentes more than twice the length 

 of the manubrium; mucrones jirovided with four teeth, apical 

 one is very small and at the liase of the second, the other three 

 are large, blunt; second tooth falcate, third and fourth sub- 

 falcate and nearly opposite each other. Clothing of dense 

 short hairs with longer ones on the posterior end of the 

 abdomen. 



Habitat: Found with Isotoma viridis at Camp Baldy among 

 leaves near the stream, and also in Palmer's and Bear canyons 

 and at Laguna Beach, although not abundantly. Guthrie states 

 that he did not find the species very abundant in Minnesota and 

 took them from under the loose bark of a log on the bank of 

 the Minnesota Eiver and also at Lake Vermillion. 



Isotoma palustris Miiller 

 (Plate II, Figs. 8-10) 



Podiira aquafica cinerea De Geer, Act. soc. roy. Tips., 1740. ' 



Podura palustris Miiller, Zool. Dan. Prodr., p. 184, 1776. 

 Gmelin, Linnaeus, Sept. nat. ed. XIII, p. 2911, 1788. Bourlet, 

 Mem. soc. roy. Douai, 1842. Bourlet Mem. sur les Podu- 

 relles, p. 29, 1843. 



Aethescerus aquaticus Bourlet, Mem. soc. roy. Douai, 1842. 



Podura psi. Herklots, Notices EntomologigTies, 1837. 



Isotoma palustris Tullberg, Lver. Podur., p. 45, 1872. Lubbock, 

 Monogr. coll. and thys., p. 169, 1873. Uzel, Thys. Bohemia, 

 p. 62, 1890. SchStt, palaearct., coll., p. 63, 1893. Renter, Finl. 

 Coll., p. 26, 1895. liie Pettersen, Norges Coll., p. 16, 1896. 



