;l - 



Gen. 70. Arthropsy 1IUS, G. <). Sars, u. 



Generic ('lnn-<n-l< />. |!ody without ;iny dm sal or sub-dorsal processes, 

 but flanked on each side by a uniform series of acutely produced lappets arising 

 from the lateral parts of all the segment^ except the last '2. ( 'ephalic segment 

 rather broad, and produced in trout to a broadly triangular rostral projection, 

 antero-lateral corners rounded oil'. Anterior antenna- less slender than in the 

 preceding genera, and in female composed of only 3 joints; those in male strongly 

 hinged. Posterior antenna' likewise rather robust. Oral parts exhibiting the 

 structure eharaeteristic of the family. Natator\ legs with the 2nd basal joint 







less produced than in the '.y preceding genera, 1st pair with both rami biarticu- 

 late and sube<|iial in si/.e. Inner ramus of the 3 succeeding pairs well developed, 

 Inarticulate, though shorter than the outer; that of 2nd pair slightly transformed 

 in the male. Last pair of legs of normal appearance, with the distal joint 

 slender and narrow, proximal joint with a well-defined setiferous expansion inside. 

 \\anting however in male. 



/.'< /,/"//>. This genus, like the 3 preceding ones, is based upon a single 

 species, which in spite of the rather different external appearance of the body, 

 in all anatomical details exhibits a near relationship to those genera, and more 

 particularly to the typical genus. A>icli<>i-<il>t>lii*. The generic name here proposed 

 refers to the sharp demai-cation of the segments, due to the acutely produced 

 lateral parts 



2i>7. Arthropsyllus serratus, G. 0. Sars. n. sp. 



(PI. c< XIV). 



Sji'-rifir Characters. Female. Pod\ moderately slender and somewhat 

 depress,.,!. taperiii 1 ,' niadiialK behind, \\ith all the segments very sharply defined. 

 < 'ephalic segment COnsparativelj broad, and about the length ot the .'! succeeding 

 segment- .-, unbilled, rostral projection triangular, broad at the base and terminating 

 in 2 small prominences, dor-al lace of the segment smooth and slightly vaulted, antero- 

 lateral corners e\eiil\ rounded, lateral edges each exhibiting beyond the middle a small 

 notch, and behind it produced to an acute lappet pointing oblh|Uel\ backwards. Kadi 

 of the 1 succeeding segment- produced on each side to a similar, though soiueuhat 

 larger lappet. I'rosi.me some\\hat shorter t ban the anterior division, and provided 

 with :; pair- of lateral lappets similar to those on the anterior part of thebod\. 

 though soiueuhat diminishing successively in si/e. the 2 posterior segments being 



