128 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
This genus differs from Ceculus Duf. in that the palpi are 
not raptorial but tactile, are composed of four instead of five 
segments, and are unarmed instead of bearing claws. The eyes 
are sessile, not stalked as in Ceculus, and a single, median 
eye is also present. The arrangement of the shields which 
cover the body is different from that found in Ceculus. There 
is a pair of horn-like processes on the anterior part of the 
cephalo-thorax and another pair on the dorsal aspect of the 
chelicere. The legs are less spinous than in Ceculus. 
Ceratoacarus pacificus n. sp. 
(Fig. 3) 
Female—Robust; body and anterior pair of legs reddish 
brown; the rest of the appendages a yellowish brown. Integ- 
ument of the body, chelicere and the anterior pair of legs well 
chitinized and coarsely granular; the integument of the remain- 
ing parts of the body not so well chitinized and more finely 
granular. Chelicere very large, surpassing the palpi; together 
they are almost as broad at their bases as the width of the 
cephalo-thorax at its anterior end. Each chelicera bears at its 
anterior end a small, curved, simple hair; and above near the 
middle a prominent horn-like tubercle, which bears in turn a 
long, simple, tactile seta which extends beyond the tips of the 
chelicere. Segment I of palpus as broad as long; segment II 
slightly over twice as long as broad; segment III subequal to 
segment II; segment IV short, papilla-like, and bearing four 
large, long tactile bristles and one much shorter bristle. 
Cephalo-thorax not distinct from abdomen. Anterior shield 
about three times as broad as long, and bearing at each anterior 
lateral corner a prominent seta-bearing horn; seta of horn 
simple, curved, about twice as long as the horn itself and 
arising from the lateral side of the same about one-half the 
distance from the base. Median eye prominent, larger than 
either of lateral eyes. Posterior dorsal shield covers all of the 
abdomen and more than one-half of the cephalo-thorax; broad- 
ened at the shoulder region where are situated the lateral eyes, 
and just back of these a larger pair of sensory organs which 
