studies (ill iHuriin: Uslraiuds 4G'J 



G. 0. Sahs — has unfortumitely been lost. It seems to me rather probably that in describing 

 this species G. O. Sahs has mjt confused two forms, as G. VV. MUlleh seemed inclined to 

 believe at first — cf. G. W. MOlleh, 1894, p. 218. 



Key to tlie species described in tliis treatise (applies also to the males investigated b}' me): 



The end joint of the first antenna has seven bristles, two simple 



sensorial filaments, d- and e-bristles. — 2. 

 The end joint of the first antenna has six bristles, only one 



simjjle sensorial filament, the e-bristle, is developed, 



the d-bristle verruciform. — 3. 



The first endopodite joint of the mandible is furnished antero- 



distally with powerful chitinous spines. A. s'pinifera. 



The first endopodite joint of the mandible has no powerful 



chitinous spines at all. A. quinquesetae. 



The second endopodite joint of the mandible has a long, 

 narrow bristle, with short, fine hairs, between the b- 

 and 0- main bristles. The sensory bristle of the fifth 

 joint on the female first antenna has only six sensorial 

 filaments. — 4. 

 The second endopodite joint of the mandible has no such bristle 

 between the b- and c- main bristles. The sensor}' 

 bristle of the fifth joint on the female first antenna 

 has seven sensorial filaments. — 8. 



The sixth limb has no posterior ventral bristles. A. aberrata. 



)j ), ,, nas ,, ,, ,, o. 



The (original) third joint of the first antenna has five bristles 



on the anterior edge. A. curta. 



The (original) third joint of the first antenna has six bristles 

 on the anterior edge. — 6. 



The distal bristle of the endopodite of the second antenna is 

 about as long as or only slightly longer than the endo- 

 podite. The second endopodite joint of the 

 mandible has comparatively numerous cleaning 

 bristles, seven in :i distiiict lower row. from five to 

 eight in a distinct upper row. A. Ohlini. 



The distal bristle of the endopodite of the second antenna is 

 twice or more than twice as long as the endopodite. 

 The second endopodite joint of the mandible 

 has comparatively few cleaning bristles, five or six in 

 a distinct lower row, two or three in an upper row. — 7. 



