KONGL. SV. VET. AKADEMIENS IIANDLINGAU. BAND. 22. N:0 7, 21 



three times as long as the peduncle, uuiarticulatc; a few lorig auditory cilia at apex; a 

 single T'ow of sliort hairs on the interiör surtace. In the female the first pair of anteiinaj 

 are of the same shape but much smaller, and the joints are more plainly visible. 



In the young animal the tirst pair of antennaj are short and stout, situated nearer 

 the superior margin of the head than in the adult; the first peduncular joint as long as the 

 three tei-minal ones; the second longei- than the third, and their bi"eadth less than that of 

 the first; the fourth joint small, and either rounded or bi"oadly triangulär with rounded 

 apex; flagelliim ininute, linear, uniartieulate, with one or two cilia crowning the apex, as 

 long as or longer than the flagellum. 



The second pair of antennce rise from the interiör portion of the head, near the 

 buccal region; more than twice as long as the tirst pair; peduncle four-jointed ; tirst and 

 second joints long; tirst about half the lengtli of the second, extending to the anterior 

 margin of the head, but not exposed beyond it; second joint slender, cylindrical, and the 

 entirc length of its upper börder closely set with short equidistant hairs, curled at their 

 tips; third and fourth joints short, subequal, about one quarter the length of the second, 

 a few hairs on the upper sui"face; tlagellum linear-lanceolate, in length almost equal to 

 the second joint of the peduncle, uniartieulate, pointed, with seven or eight slight serrations 

 along the superior edge, one or more hairs at each serration. The second joint is directed 

 ujnvard and outward, and the third, fourth, and tlagellum are bent downward, nearly at 

 a right angle with the second. When the animal is at rest the second pair of antennaj 

 are evidently folded up in this manner in the concavity in the front of the head. In the 

 female they are quite different, they do not extend at all, or very slightly, beyond the 

 anterior margin of the head. The tirst peduncular joint is very short, and broader than 

 the following; the second is long, and reaches nearly to the anterior margin of the head; 

 the third joint is rudimentary; and the fourth is apparently obsolete. The tlagellum is 

 small, about one-third the length of the tirst joint, lanceolate in shape, and with two or 

 three stout cilia at its apex. The shortening is chiefly due to the diminished length of 

 the tirst joint of the peduncle. 



In the young animal this pair are represented by a small rounded tubercle, tipped 

 by a cilium; situated just beneath the tirst pair. 



The depth of the perceon decreases slightly posteriorly. In the female the perseon 

 is sh orter and deeper, and the last segment is much narrower. 



Tha first jifti)' of pera^opjoda are shorter and more robust than the second; the tibia 

 is produced postero-inferiorly ^), at its extremity a number of stitf hairs, slightly curled 

 at their tips. The carpus is broad, dilated posteriorly, but not produced infexdorly, with 

 its interiör edge straight, and armed at the posterior angle with two stout spines or bristles. 

 The metacarpus is shorter than the carpus, and about one-half as broad. The dactylus 

 is very minute. 



The second pair have none of the joints dilated. The tibia is short, about one 

 fourth the length of the carpus. The carpus is slender and cylindrical. The metacarpus 



^) The wordiug- of his description is: »antero-inferiorly» but he evidently means that tbe lower hinder 

 corner is produced. 



