JOURNAL OF ENTOMOLOGY AND ZOOLOGY 149 



lon.i^' ai!(l Itiit liltlc curved, second and third teetli of about the 

 same leiiiitli, vertical, on ()i)))osite sides of the nuicrones and 

 nearly opjjosite eacli other. 



Variation: MacGillivray described the antennte, "First and 

 second segments dilated, as 1)road as h)no' and twice as broad 

 as tlie third and fonrth." In my s))ecimens I is as broad as 

 long', but this is not trne of II. Also I and II are not as broad 

 as ill and IV. 



Hahitdt: A very few of these s])ecimens were fonnd nnder 

 the rocks dnring low tide at Lagima Beach. 



C. B. Davenport has collected s]:>ecimens from the sand at 

 Cold S))ring Beach, Massachusetts, and they have been taken 

 from Spitzliergen, Polaris Bav, and Massachusetts Bay. 



Isoioma af^pera n. sp. 

 (Plate II, Figs. 1-4) 



Descriptin]) : Length — 1.5 mm. Color — Great variation, dirty 

 white with no markings to mottled gray. Antennse — Longer than 

 head, IV longest and thickest, II and III subeqnal, I little shorter 

 than II and III. Ocelli — Widely separated, sixteen. Postan- 

 tennal organ — Flliptical with a rim. Claws — Two; superior 

 armed with two teeth on the inner margin, and two teeth on 

 the onter margin; inferior, wide and stont, curved on the inner 

 margin. Furcula — Does not reach ventral tube; dentes nearly 

 three times manubrium; mucrones short and curving, triclen- 

 ticulate, second and third teeth opposite. Integument — Very 

 h.airy. 



Varidfio)) : The color varies a great deal. 



Hahifaf: Camp Baldy, altitude 4700 feet, March. Lytle 

 Creek, A])ril; San Dimas, left fork. 



Isotoma iiii}iiiiia Guthrie 

 (Plate II, Fig. 5) 

 Isoto))ia iviuima Guthrie, 1903. The Collembola of Minnesota, 

 Geol. and nat. hist. surv. of Minn, zool., series 4, pp. 1-110. 

 Description: Leniith — .75 nun. CVilor — Grayish blue. An- 

 tenna' — Short, little longer than head; IV longest and swollen; 



