June, ipii.] EwiNG: NoTES ON PsEUDOSCORPIONS. 75 



middle and almost evenly rounded behind. From the posterior margin of 

 each of the first six abdominal segments there projects backward a pair of 

 spine-like tubercles situated near the lateral margins of the abdomen. These 

 tubercles are the most prominent on the second and third segments. Ab- 

 dominal scuta of almost equal thickness and covered with scale-like tubercles. 

 Each scutum has a transverse row of ten, short, clavate hairs situated near 

 its posterior margin. When the abdomen is viewed as a whole these hairs are 

 seen to be arranged into longitudinal rows. 



Legs stout ; anterior pair longer than the first four segments of the pedi- 

 palps combined ; last pair which is considerably the stoutest extending beyond 

 the posterior margin of abdomen. The posterior cox3e are peculiar in possess- 

 ing each a prominent, stout, curved spine on its anterior border equal in 

 length to about one-third the width of the coxae. Femur of leg four some- 

 what swollen, almost one-half as broad as long. 



Length 2.25 mm. ; breadth 1.20 mm. 



Female. — The female differs from the male in being without the lateral, 

 posteriorly directed spurs on the abdominal scutse ; in being without the chitin- 

 ous spur on the last coxse ; and in having fewer and smaller hair-bearing, 

 tooth-like tubercles on the cephalothorax. 



This description is drawn from specimens which do not show 

 the extremes of variation. 



Chelanops corticis, new species (PI. Ill, Fig. 9). 



Male. — A dark species. Pedipalps almost black ; cephalothorax a very 

 dark brown ; abdominal scuta dark. 



Chelicerae about two-thirds as long as the trochanters of the pedipalps ; 

 movable digit much stouter and also longer than the fixed one ; spinneret 

 rather large, about two-thirds as long as the finger upon which it is situated, 

 with six spine-like processes toward its tip, the two distal of which are the 

 largest and are curved outward. On its inner distal margin the movable digit 

 is provided with an inwardly directed, curved claw and an anteriorly directed, 

 straight, sharp spine about twice as long as the curved claw. 



Pedipalps stout ; longer than the body ; trochanter subglobose and a little 

 over one-half as long as the femur : femur with short pedicel, narrowest near 

 its middle ; external margin of femur strongly convex, internal margin con- 

 cave for its distal one-half ; tibia about as long as femur, but broader, swollen 

 on its inner side and almost evenly convex on its outer side ; hand as long 

 as the fingers, the latter stout, provided with a distal claw ; teeth, large and 

 sharp. All the parts of the pedipalp except the fingers clothed with short, 

 stout, but not clavate hairs ; fingers with many short but more tapering hairs 

 and with about six long tactile bristles. The hairs of the fingers arise from 

 mitlute tubercles, and in this respect differ from those of most species of the 

 genus. 



Cephalothorax two-thirds as broad as long, with two indistinct indica- 

 tions of segmentation and apparently without eyes. 



