292 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Description 



Color: Light straw with a deeper color where the chitin is thicker, 

 especially between the lateral processes of the body. Skin pitted. 



Body: Broad, no segmentation. The lateral processes separated from 

 each other by narrow intervals which penetrate well toward the center 

 of the central disc of the body. The lateral processes are provided with 

 2 moundlike elevations at their free margins on the dorsal side. The body 

 as a whole is of a nearly circular outline, truncate in front. The ocular 

 region of the 1st body segment presents a straight line at its cephalic 

 margin, and the elevation including the ocular eminence is in the form of 

 a rounded triangle. This triangle is slightly higher than the surrounding 

 body parts. The ocular elevation is in the center of the broadest side of 

 the triangle, which is the front margin. The lateral margins of this whole 

 elevation are bent in on each side, giving the triangular elevation a 3- 

 pointed area whose front margin is straight and whose lateral margins 

 are curved in. 



Eye tubercle: This is a sharply pointed elevation in the center of 

 the front margin of the triangular elevation mentioned above. The 4 eyes 

 are along the sides of this projection and are but slightly pigmented, 

 although well formed and about of equal size. 



Proboscis: Broad at the base and then tapers quickly to less than 

 half the breadth of the base and ends in a rather small tip. It is shorter 

 than the palpi. There is a slight suggestion of constriction about % of its 

 distance from the base. The tip of proboscis including its last i/^ bends 

 sharply downward. 



Caudal segment: Cylindrical, about as long as the lateral processes 

 and bears several short hairs. 



Chelifori: Single-jointed, slightly longer than the 1st palpal joint, 

 and a little less than half as wide as the 1st palpal joint. They are just 

 within the palpi in position, and each is provided with 3 or 4 short stout 

 spines near its tip. 



Palpi: These seem to be 5-jointed. The 1st joint is short, the 2nd 

 about twice as long. The 3rd is the longest joint and gives some indica- 

 tion of fusion of 2 parts. The 4th joint is short, with a blunt free projec- 

 tion at its inner end distally. The last, or 5th, joint is longer than the 4th 

 but more slender. There are vtry few hairs on the 1st joint. The 2nd 

 has a lateral hair which is quite prominent. The 3rd joint near its base 

 has several prominent hairs, especially a rather long slender median one. 

 Toward the tip of this joint are a few more moderately prominent hairs. 



