ENTOMOSTBACA OF MINNESOTA. 69 



of the outer ramus with its termiaal claw is two thirds as long again 

 as the preceding segment, the breadth of the latter two-thirds its 

 length. The third joint is indicated by a single long, stout seta and 

 one or two smaller ones. 



"In the male the geniculate antenna is relatively rather slender, its 

 last two joints without special appendages, its penultimate with a 

 slender transparent apical process, reaching about to the middle 

 of the succeeding segment, acute at tip, but neither serrate nor 

 emarginate. Fifth pair of legs in the male usually without internal 

 ramus to the right leg, but this ramus sometimes represented by a 

 small rudiment. The limb is usually slender and its terminal claw 

 short. The basal segment of the outer ramus is nearly as long as the 

 adjacent segment of the pedicel, and the slender second segment of 

 this ramus is fully as long. Long lateral spines borne near the tip of 

 this segment. The terminal claw is about two-thirds as long as the 

 segment, is somewhat abruptly angulated near its base and slightly 

 recurved at the tip. The inner ramus of the left leg is very stout and 

 long, reaching almost to the tip of the outer ramus, is slightly carved 

 outwards, and has the apex minutely hairy. The basal segment of 

 the outer ramus is thick, two thirds as broad as long, somewhat 

 inflated within, where it extends downwards beyond the articulation 

 with the second segment as a rounded expansion covered with ex- 

 tremely fine hairs. Second segment of this ramus longer than first, 

 but only half as wide, bearing at its tip, within, a rather small, 

 obliquely projecting cushion covered with cilia, and two stout terminal 

 spines, one short, blunt, straight, and smooth, the other curved and 

 plumose, its length about half of the segment to which it is attached." 

 Length 2.5 mm. 



* Diaptonius siciloides Lilljeborg. 



Plate VIII. Fig. 10. 



De Guerne and Richard '89. 



This species approaches D. sicills Forbes and D. caroli Herrick very 

 closely, and is said also to resemble D. gracilis Sars. From caroli it 

 may be at once distinguished by reason of the fact that the third joint 

 of the outer ramus of the fifth foot of the female is obsolescent. From 

 the smaller form of D. sicilis it is scarcely possible to distinguish it. 

 The spinous armature of the thorax and abdomen seems more 

 marked, and the second segment of the abdomen is shorter in sici- 

 loides and there is an appendage to the inner aspect of the basal joint 

 of the outer ramus of the right leg. Last two segments of thorax con- 

 fluent, bearing two lateral spines. First abdominal segment longer 

 than the rest of the abdomen, laterally spined. Second segment very 

 short. Caudal stylets once and a half as long as broad. Antennae 

 somewhat exceeding the stylets. The antepenult joint of the right 



