1873.] J. Wood-Mason — Sjwcws of Phasmidce. 51 



private collector during the months of August, September and October last 

 in the neighbourhood of Port Blair on South Andaman. An immature 

 insect collected by Mr. Homfray at Camorta, Nicobar Islands, differs so 

 slightly from larvae, beyond doubt belonging to the present species, that I 

 hesitate to give it another name. 



Bacillus (Baculum) Artemis, Westwood. PL VI. Figs. 1-2. 



Bacillus ? Artemis, $ , Westwood, Cat. of Orthopterous Insects in the British 

 Mus., 1859, Pt. I, Phasmidse, p. 10, pi. xxvi, fig. 9, 9a. 



B. patellifer, Bates, 9, Trans. Lin. Soc. London, 1865, Vol. xxv, Pt. I, p. 328. 



Numerous specimens of an insect remarkably abundant in the moist, 

 deep valleys of Sikkim, in Cachar, in the Bhutan Doars and at Samagooting 

 in the Naga Hills, agree in every respect both with Bates' description of 

 J5. patellifer and with Bacillus ? Artemis described and figured by Prof. 

 Westwood from a dried and mutilated example now in the Hopeian collection 

 at Oxford. The comparison of dried specimens in my possession with 

 Westwood's figures shows that the compression of the three terminal seg- 

 ments is mainly, and that the depression and enlargement posteriorly of 

 the sixth dorsal are entirely effects of drying. Bates omits to mention 

 that the terminal dorsal segment is grooved above in the middle line, and 

 that the emargination in its posterior border is occupied by a small carinated 

 azygos plate with a rounded hinder margin ; the state of preservation of 

 Prof. Westwood's specimen may probably account for his omission to men- 

 tion not only these points but even the emargination itself. The following 

 are the dimensions of a specimen from the Naga Hills figured on plate vi. 



Total length 4 in. 5 lines, ant. 7 lines (25-jointed), head 2\^ proth. 

 2, mesoth. lOi, metath. 8, abd. 2 in. 0^ line + 6 = 2 in. 6|-. 



A variety found in all the districts mentioned above with the excep- 

 tion of the Bhutan Doars is figured side by side with the typical form on 

 the same plate as showing the value of the armature of the legs unsupported 

 by other characters in making a species ; almost every gradation from the 

 extremely acanthophyllous and spinose condition of the legs there depicted 

 to their almost completely unarmed condition in fig. 1 being to be met with. 

 Fig. 2 a, 2 b, 2 c may represent the same parts of fig. 1. • 



Bacillus (Bacultjm) insigists, n. sp. PI. V. Figs. 1-2. 



$ Extremely robust, greatly elongated, subcylindrical, convex. Head 

 remarkably stout, conspicuously narrowed from the eyes to the base, the 

 sides being almost straight, armed between the eyes with two stout-based, 

 acuminate, forwardly-directed and incurved spines or horns, notched 

 posteriorly in the middle. Antennae 25-jointed ; basal joint depressed, 

 expanded, and carinated above. Mesothorax gradually attenuated from the 



