ART. 17 ON TEREESTEIAL ISOPODS LOHMANDER 11 



Antennae (fig. 3 c-d) rather short. The basal joint is narrow, 

 transverse, the second and third joints are subequal in length and 

 twice as long as the first, the fourth is one and a half, and the fifth 

 twice as long as the third. The last three joints have the inner 

 margins beset with numerous strong tuberculiform papillae, each 

 surmounted with a tuft of very short bristles. The fifth joint is 

 produced at the outer distal angle into an acute process and carries 

 at the inner angle a curved seta. Flagellum scarcely as long as the 

 fifth joint of the peduncle (scapus), composed of four joints, the first 

 of which is shortest, and the third longest. The last joint is tipped 

 with a bunch of hairs. At the middle of the third joint there is a 

 group of about four olfactory setae {Leydigsche Borsten). 



In the female the antennae are relatively longer and much more 

 slender than in the male but show otherwise about the same pro- 

 portions. 



Left mandible (fig. %j) with the outer cutting edge formed of 

 three very long, strongly chitinous teeth, one of which is bifid at the 

 end. The inner cutting edge {lacinia mohilis) also ends in three 

 large teeth near the base of which arise two curved plumose setae; 

 next follows a single one, and then from a marked prominence a 

 brushlike tuft of long plumose setae, the inner one of which is 

 shortest, the others gradually increasing in length, the outermost 

 one being very long (seta inferior) . 



Right mandible (fig. 6^) similar to left but the teeth of the outer 

 cutting edge are much shorter and the inner cutting edge {lacinia 

 mohilis) ends in a crown of numerous small pointed teeth of irregu- 

 lar size. Inner cutting edge attended by a bunch of stiff bristles, 

 between which and the dense tuft of long plumose bristles are two 

 large plumose setae. 



Lower lip (fig. 2>e) formed of two rounded lobes which have the 

 extremities thickly covered with short fine setae and have on their 

 dorsal side a small number of short spines. Between these lobes is 

 a narrow tonguelike central lobe, hairy at the end. 



First maxillae (fig. 3 f-g), outer lobe narrow lanceolate, inner 

 margin fringed with few, outer margin with a great many fine, deli- 

 cate setae which are arranged in short transverse rows {Kami^n- 

 schuppen; comb lamellae). The extremity of the lobe bears about 

 10 stoutly chitinous spines of different sizes, five of which are bifid. 

 Inner lobe narrow and provided with two subequal brushlike setae. 



Second maxillae (fig. 2>h) distinctly bilobed at the apex, outer 

 lobe shorter and very much more slender than the inner, both rounded 

 and bearing delicate setae and a number of short stout blunt setae, 

 three at iho, apex of the outer lobe and about a dozen in a single row 

 at the extremity of the inner. 



