230 AUGUSTA KUCKEli. 



LiTEKATUEE. 



19U1. BoEREK, Caul. — " Zur aussereu Morpliolojrie von Koeiienia mira- 

 bilis, Grassi, in ' Zoologisclien Anzciger,' Bd. xxiv, No. 652, 

 pp. 537—556. 



1885. Grassi, Battista. — " lutoruo ad un nuovo Aracnide art rogastro 



(Koeueuia mirabilis) clie crediamo rappresentante d' un nuovo 

 ordine (Microtlielyplionida)," ' Natural. Sicil.,'anno4, pp.127 — 



133. 



1886. Grassi, Battista.- — "I Progenitori dei Mereapodi e degli Iiiseiti : 



Mem. V. lutorno ad un nuovo Aracnide artrogastro (Koenenia 

 mirabilis) rappresentante d' un nuovo ordine (Micro the ly- 

 phonida)," ' Bull. d. Soc. Eutom. Italiana,' pp. 153—172. 



1897. Hansen, H. J., and Sorensen, W.— "The Order Palpigradi, Ther. 

 (Koenenia mirabilis, Grassi), and its Relationship to the other 

 Arachnida," in 'Entomologisk Tidskrift,' pp. 223 — 210. 



1901. Hansen, H. J.—" On Six Species of Koenenia, with Remarks on the 

 Order Palpigradi," in 'Entomol. Tidskr.,' pp. 193—240. 



1901. RucKER, Augusta. — " The Texan Koenenia," in ' American Natural- 

 ist,' pp. 615—630. 



1903. RucKER, Augusta. — "Further Observations on the Texan Koenenia," 

 in 'Zoolog. Jahr.,' Ablh. f. Morph. 



1900. Wheeler, W. M. — 'A Singular xVrachnid (Koenenia mirabilis, 

 Grassi) occurring in Texas," in ' Amcr. Nat.,' pp. 837 — 850. 



EXPLANATION OF PLATE 18. 



Fig. 1. — Dorsal view of K. florencia; (8 oc. X 3 obj.). The setae of head, 

 thorax, and abdomen are shown in their natural position. The abdomen is 

 slightly rolled to the left, so that the broad strip along the mid-dorsal line 

 which is devoid of sets is not so striking. 



Fig. 2. — Ventral view of the head and thorax of K. florenci8e(l oc. x7obj.). 

 The arrangement and position of setie of the proximal joint of the chclicerse 

 are shown. The distal joints of the chelicerse which often obscure the setfle 

 are not drawn. The characteristic peaked condition of the labrum with its 

 curved row of five pairs of hairs is shown. The five cephalothoracic sternal 

 hairs arc shown in their natural position. The peculiar tliiniblc-sha)){'d thick- 

 ening of the stcrn\nn between the fifth pair of appendages appears in all the 

 stages as is figured here in tiie adult. 



