Pomona College, Claremont, California 3 



The long process of the coxa clothed with its long simple hairs 

 seems to have some performance in the work of the mouth parts. 

 The labium is subo\al, clothed thickly with simple short hairs, the 

 upper margin ha\"ing a single row of long heavy straight hairs 

 with many long single cur\ed hairs co\'ering them. 



The mandibles are provided with three distinct kinds of hairs 

 or spines. The large subquadrate proximal joint was clothed with 

 long barbed spines, the movable finger having on its median sur- 

 face a row of fifteen back cur\ed barbed spines. In the space 

 between the movable and stationary finger were long hairs, en- 

 larged in the center and tapering off to a fine point, the tapered 

 portion being barbed. The mandibles are set well down in the 

 sephalothorax. 



The sexual openings were found in the usual place; the ventral 

 surface of the first abdominal segment, this being enlarged so as 

 to do away with the second abdominal segment. The epigynum 

 consists of a long epigastric furrow with a large lip-like opening 

 near its median line. Just abo\-e this opening and on either side 

 were small longitudinal creases. 



Prof. Dr. Friedrich Dahl places the external sexual organs of 

 this family on the legs and in the Thelyphonidae which is closely 

 related. They are found in the second joint of the tarsus of the 

 first legs. Careful study failed to find any trace of secondary sexual 

 organs in Trilhyrctis pciitupcltis. 



KniyscVni, Karl 1899 



Das Tierreich. Scorpiones iind Pedipalpi. 



Cook,O.F. 1899 



Hubbardia, a new genus of Pedipalpi, Entomological Societ\ Proceed- 

 ings, vol. 3. 



Comstock, John Henry 1911 



The Spider Book, pp. 17-18. 

 Banks, Xatlum 1900 



Synopsis of North American Invertebrates. Am. Nat. \"c)l. 34. 

 Dahl, Dr. Friedrich 1913 



Vergleichende Pli\siologie and .Miirphologie Der Spinnentiere. 

 Jena, Verlang N. G. Fischer. 



(Crtntrilnitinn froiii the Z'joloijical Laboratory of Poinorui Colhge.) 



