124 Journal New York Entomological Society. [Voi. xvii. 



Family NOTHRID.E. 



Genus LIACARUS Michael. 



Body not sculptured nor pitted ; last three pairs of legs inserted 

 under the body ; with lamellae ; claws tridactyle. 



Key to Species Described. 



1. Pseudostigmatic organ with the enlarged part or head situated as usual at the distal 



end of the same 2. 



Pseudostigmatic organ with enlarged part near the base, the distal portion flagellate, 



L. latris sp. nov. 



2. Pseudostimatif organ with very long filiform head equal in length to the pedicel 



from which it extends L. glabe7- sp. nov. 



Head of pseudostigmatic organ clavo-lanceolate and about one half as long as the 

 pedicel from which it arises L. imii^mlameUatus sp. nov. 



Liacarus latus, new species. (Plate IV, Fig. i6. ) 



Very dark brown ; surface of integument smooth. 



Cephalothorax triangular, as broad as long ; lamellae large, of about equal width 

 throughout their length, as long as the cephalothorax, bifid in front, anterior one 

 third free ; translamella a narrow blade about one fourth as broad as the lamella ; no 

 lateral lamellae. Interlamellar hairs very short, straight, stout and erect, situated at 

 the bases of the lamellae ; lamellar hairs similar to interlamellar hairs, situated at the 

 bottom of notch in the anterior margin of lamellae, directed slightly towards the 

 median plane ; anterior lateral hairs small, straight and inclined markedly towards 

 the median plane. Pseudostigmatic organs elongate, swollen at the base with the 

 remaining parts spine-like, about one half as long as the tarsus of leg I. 



Abdomen globose. Genital covers about one and one half times their length in 

 front of the much larger anal covers. Anal covers subrectangular, each one half as 

 broad as long and situated almost approximate to the posterior margin of ventral plate ; 

 ventral plate circular. Abdomen hairless. 



Legs small ; anterior pair about one half as long as the abdomen ; tibia longer 

 than tarsus ; tarsus I broad at distal end. Posterior legs somewhat longer than the 

 others. Legs well clothed with rather long hairs. Ungues tridactyle ; dactyles 

 equal. 



Length, 1.09 mm.; breadth, 0.70 mm. 



In moss. Collected by the writer at Urbana, Illinois. Two 

 specimens. 



Liacarus glaber, new species. (Plate IV, Fig. 17.) 



Brown ; integument thick, surface smooth. 



Cephalothorax triangular ; lamellae almost as long as cephalothorax and of equal 

 breadth throughout. Lamellar hairs short, about one third as long as lamellae ; inter- 

 lamellar hairs erect and similar to lamellar hairs. Palpi prominent. Pseudostigmatic 

 organs long and recurved, with a small peduncle and an elongated, long, clavate 

 head. 



