138 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



nine times as long as the stylet. The fifth foot of the female nearly 

 as in the previous species, but the proportions of the setre differ. The 

 fifth feet of the male are like those of J/, alhuquerquensis. The antennae 

 of the male seem to be different. In M. alhuquerquensis the apical seg- 

 ment is larger and the flagellum is long and of uniform width, while 

 in the present species the flagellum is short and clavate. The swim- 

 ming feet seem similar. Length of male 0.56 mm., length of first seg- 

 ment 0.15 mm., length of stylet 0.04 mm., length of longest seta 0.28 

 mm. to 0.3i mm. 



The stylets in the female of J/, alhuquerquensis measure 0.072 mm. 

 in the female and over 0.08 in the male, the longest seta being 0.37 

 and 0.42 respectively. 



It must remain for larger experience to determine the value of 

 these distinctions, which rest on comparatively few individuals in the 

 case of il/. hrevieaudaia. 



