44 COLLEMBOLA OF MINNESOTA 



The mucrones has its lower edges very finely serrate. In Lub- 

 bock's figures there are but six occelli depicted on each eye spot, 

 and no one seems to have noted the great reduction of the second 

 ocellus from the front on the inner row. It has shifted in posi- 

 tion until it has come to lie close to the front margin of the ocel- 

 lus lying next behind it, and has become triangular in shape. 

 The central ocellus is small as is commonly the case in this 

 genus, and particularly so in the closely allied species: niger, 4- 

 maculatus and minutus. The eyespot itself is broader than in 

 any of the three species named. The sub-anal papilla is slender 

 as in 4-maculatus, but squarer on the end. 



I have noticed that when this insect takes a full leap it nearly 

 always lights on its back. 



Sminthurus minutus MacG. 



Plate V, Figs. 113-15. 

 1862. Smynthurus minutus. MacGillivray, Canad. Ent. XXVI, p. 109. 



It is always unfortunate that a species should be described 

 without accompanying figures, as was the case in this following 

 description by MacGillivray, yet with a description so carefully 

 written of a species so characteristic in coloration little confusion 

 is liable to result. "Black and yellow; head yellow, except be- 

 hind and the eyespots which are black, black extending around 

 on the side of the face below the epespots, eyespot narrowly en- 

 circled with yellow ; on each side below the eye spot, three clear 

 spots arranged in a transverse line ; a black, ocellus-like spot 

 on the vertex between the antennae ; antennae reaching beyond 

 the apex of the thorax ; basal segment black, globular, one-half 

 the length of the second ; second segment sub-equal to the 

 third, petiolate at base, naked; third segment about one-half 

 the length of the fourth, enlarged at middle, yellow, with 

 a few scattered hairs ; fourth segment yellow, blunt at tip, mod- 

 erately hairy, not ringed ; thorax black, except a small part of 

 the sternum, which is yellow; legs short, stout, yellow; claws 

 short, outer claw about as long as the tibia is broad, sinuate be- 

 neath, with a single tooth above ; three tenant hairs present ; 

 abdomen black except a yellow spot on the under side of the 

 anal tubercle, naked, except a few bristles on anal tubercle ; 

 furcula slender, slightly hairy beneath ; manubrium reaching the 



