136 ^Ir. R. 1. Pocock on the 



Legu sliort, mostly with a single seta on the lower surface 

 of each sogniont. 



Nunihcr of segments 70. 



I.engtii about llo millim. 



A single female example from Malamaui (Philippines). 



This species differs from all the Indo- and Austro-Malayan 

 forms that are characterized by long ventral grooves in that 

 there is no caudal process overlapping the valves. 



ACANTHIULUS, Gcrvai.'*. 

 Acanthiulus, Gervais, Ann. Sci. Nat. (3) 1, p. 70; Ins. Apt. iv. p. 173. 



The species of Acanthiulus can scarcely be regarded as 

 more than extremely well-marked forms of Spirobolus. The 

 constitution of the mouth-parts and the number and dispo- 

 sition of the legs of the anterior segments are the same in the 

 two groups. In fact the oidy character by which Acanthiulus 

 is to be distinguished is the presence of a transverse row of 

 (8) spiniform tubercles on most of the segments. Nevertheless 

 the collum is undoubtedly much longer than is usually the 

 case in Spirobolus. This last character no doubt misled 

 Gervais into stating that his species belonged to the genus 

 Spirostreptus of Brandt, and probably this statement, coupled 

 with the presence of the spines on the segments, will account 

 for Latzel's erroneous surmise that Acanthiulus and Trachy- 

 iulus were synonyms. 



Acanthiulus Murrayi, sp. n. (PI. IX. figs. 7-7 b.) 



Colour black or olivaceous, with a series of red spots on 

 each side marking the pore ; legs and antennae olivaceous, 

 with the distal ends of the segments flavo-annulate. 



Face entirely smooth, the frontal sulcus mesially interrupted; 

 labral border somewhat deeply excised; pores 2 + 2. Ei/es 

 well developed, subcircular, separated by a space equal to 

 about twice a diameter. Antennoi long and slender, much 

 longer than the face. 



Collum smooth above, projecting laterally below the level 

 of the second segment, the anterior border of the lateral portion 

 widely emarginate and defined by a deep sulcus, which curves 

 round the inferior border, the jjosterior border deeply and 

 abruptly emarginate ; the inferior surface of the second 

 segment flat, with carinate anterior border, the posterior 

 margin of this segment longitudinally grooved below, irregu- 

 larly wrinkled above, with a squamiform tubercle in the 

 middle of the lateral surface ; the third, fourth, and fifth 

 segments sculptured like the second, but more coarsely, the 



