54 Transactions. — Zoology. 



lations above, and the femora of the middle and hind legs 

 have three very small ones below, in a row. 



Length of the body, 43 mm.; of mesothorax, 9 mm.; of 

 metathorax, 6 mm.; of abdomen, 22^mm. ; of antennae, 

 7nmi.; of fore femur, 11mm.; of mid femur, 8 mm.; of 

 hind femur, 10 mm. 



Male unknown. 



Hah. Great Barrier Island. 



An immature specimen, probably belonging to this species, 

 is much smoother, and the fourth abdominal segment has a 

 slight dorsal expansion. The fore femora ai'e almost smooth, 

 and the denticulations of the middle and hind femora are very 

 small. 



This species is easily distinguished from any of the others 

 by the absence of the two tubercles on the head, by the 

 spines on the abdomen being single instead of in pairs, and by 

 the absence of lateral expansions on the abdomen. 



Genus Clitakchus, Stal (1875). 



Clitarchtis, Section A, Ilutton, Trans. N.Z. Inst., vol. xxx., 

 p. 162. . 



The first abdominal segment is much longer than the 

 median segment of the metanotum. In the male the last 

 abdominal segment is inflated, and the anal styles are fully 

 exposed. 



Artificial Key to the Species. 



Fore femora with 5 or 6 strong teeth. 



Middle femora with two denticulations on inferior 

 ridge. 

 Posterior femora with two denticulations on 



inferior ridge .. .. .. .. C. hookeri. 



Posterior femora with one or no denticulations 



on inferior ridge . . . . . . C. coloreus. 



Middle and posterior femora without any denticula- 

 tions on inferior ridge . . . . " . . C. rechtctiis. 



Fore femora smooth, or with a few slight denticulations C. Iceviubculus. 



Clitarchus hookeri, White (1846). 



The female is subrugose, the head and thorax distantly 

 granulated, the granules on the vertex generally arranged in 

 a V. The bases of the fore femora are rosy. The antennae 

 are pale, each joint with a black spot at the distal end ; they 

 are 21-jointed. Length of the body, 91 mm. ; of mesothorax, 

 18mm.; of metathorax, 16^mm. ; of abdomen, 46 mm.; of 

 antennae, 22 mm. ; of anterior femur, 22 mm. ; of middle 

 femur, 15 mm.; of posterior femur, 19 mm. 



The viale has a few — up to six — granules on the mesono- 

 tum arranged in two rows ; and the fore femora have five 

 teeth, the middle and posterior femora have two small denti- 



