HuTTON. — On the Phasmidae of New Zealand. 57 



A. geisovii. The antennae ai-e broken, so that I cannot give 

 the number of joints. 



The male is unknown. 



Hab. Marton, near Wanganui. 



I name this species after my friend Mr. H. Suter, who has 

 done so much good work in the investigation of the New Zea- 

 land Mollusca, and without whose help I should not have been 

 able to identify the true A. geisovii. 



Acanthoderus geisovii, Kaup (1866). 

 Female. — Pale-green, with a black spot on the base of the 

 head, and others on the anterior and posterior margins of the 

 pronotum, as well as on the posterior margins of the meso- 

 and meta-nota, and each of the abdominal segments ; also 

 black spines on the head, thorax, and abdomen. Distal ends 

 of the tibiae and joints of the tarsi dark. Antennae with 20 

 joints. Head with about nine spines, of which a central pair 

 are larger than the others. Pronotum with two longer pairs 

 near the posterior end. Mesonotum with about fourteen 

 spines, a pair at the posterior margin, the rest irregular. 

 Metanotum with about twenty spines, of which there are two 

 pairs, one on the median suture, the other at the posterior 

 margin, the rest more or less irregular. All the spines are 

 very robust, and the larger ones sometimes have their bases 

 pale. The episterna of the mesothorax have four to seven 

 sharp spines, those of the metathorax have five or six. The 

 epimera have two, or one, or none. The mesosternum has 

 three or four pairs, and the metasternum five irregular small 

 spines. Each segment of the abdomen is swollen posteriorly, 

 and has a posterior pair of blunt black tubercles. The first, 

 second, and third have also a few rudimentary spines. From 

 the second to the sixth lateral foliations are more or less 

 developed. There are no spines on the abdominal sterna, 

 except the one at the base of the ovipositor. The anal seg- 

 ment is truncated at the end ; the cerci, or anal styles, are 

 broad. The ovipositor is rounded at the tip, and does not 

 project quite to the end of the ninth segment. The anterior 

 coxae have two pairs of spines. The anterior femora have 

 three or four sharp teeth on the lower outer margin, and 

 some smaller ones on the upper. The middle and posterior 

 femora have three teeth on each of the upper and lower 

 ridges. All the femora are distinctly foliated. The middle 

 and posterior tibiae have a blunt tooth above, near the 

 proximal end. The abdomen is narrow. Length of the 

 body, 74 mm.; of meso- thorax, 13 mm.; of metathorax, 

 13 mm. ; of abdomen, 40 mm. ; of antennae, 19 mm. ; of an- 

 terior femur, 20 mm. ; of middle femur, 13imm. ; of posterior 

 femur, 16 mm. 



