COLLEMBOLA OF MINNESOTA 49 



is bright yellow. The antennse have the first joint short, the 

 others increasing in length distally ; Ant. IV is about as long as 

 the sum of II and III ; its proximal one-third is not apparently 

 annulated, the other two-thirds quite distinctly so ; showing, in 

 my specimen, six pretty well-marked subdivisions, besides some 

 others not so plain. The tibiae have two or three clavate hairs 

 each. The claws appear to me unarmed, though Schott has fig- 

 ured a small inner tooth on the superior tooth of the third pair. 

 The furcula is rather stout ; when extended, the manvibrium 

 hardly reaches beyond the caudad end of the final abdominal 

 segment. The dentes is a little longer than the manubrium 

 and nearly three times the length of the mucrones. The dentes 

 bears ventrally a row of short hairs, and two longer ones sit- 

 uated near its two ends. The mucrones is of the narrow type, 

 but not acuminate. Its edges are quite smooth. The species 

 is rather heavy-bodied. It bears no long or strong spines on the 

 back, but is covered quite thickly with fine, short hairs, giving it 

 a pruinose appearance. The specimen was taken under a stone 

 in rather a damp situation in a rocky coulee which runs down the 

 side of the blufif to the Mississippi River below Red Wing, Minn. 

 I believe the species has not hitherto been reported from this con- 

 tinent, though known in Sweden, Germany and Bohemia. 



Sminthurus caecus Tullb. 

 PI. IV, Fig. 13; V, Figs. 1-4. 



1871. Sminthurus caecus. Tullberg, Fort, ofver Sv. Podur. p. 146. 



1872. Sminthurus caecus. Tullberg. Sver. Podur. p. 23- Ph HI, 24-25. 

 1890. Sminthurus coecus. Reuter, Coll. in Gaidar, viv. p. 19. 



1890. Smynthurus csecus. Uzel, Thys. Bohem. p. 36. 



1893. Sminthurus cjecus. Schott, Palcearct. Collenib. p. 38. 



1895. Sminthurus ccecus. Renter, Finl. Coll. och. Thys. p. 13. 



1896. Smynthurus benitus. Folsom, Psyche. VII, 446. 



1896. Sminthurus coecus. Schaffer, Coll. von Hamburg, p. 208. 

 1896. Sminthurus coecus. Schaffer, Coll. von Hamburg, p. 208. 



Tullberg's brief description serves well to identify this al- 

 bino among the Sminthurids. His description reads : "White, 

 dotted all over with rufous. Ocelli none. Xo clavate hairs on 

 the tibia. Mucrones equalling three-fourths the length of the 

 dentes. Length 2/3 mm." 



It seems to have been found chiefly under flower pots, 



