PHASMIDjE. acanthoderus. 



53 



17. (145.) Acanthoderus ranarius, Westw. 

 Plate IV. fig. 3. 



Obscure fuscus, rugosus, opacus, setulosus, dorso carina 

 media longitudinali ; antennis capite vix longioribus ; tho- 

 race e capite ad basin pedum posticorum sensim dilatato, 

 lateribus granulatis et ante pedes posticos acute angulatis, 

 segmentis abdominis postice tuberculatis, lobo apicali (seg- 

 mentum lOum simulante) exserto ; pedibus brevibus, parum 

 denticulato-tuberculatis (foem.). 



Long. corp. lin. 20 ; anten. lin. 4 ; proth. lin. 2 ; me- 

 soth. lin. 4 ; metath. lin. 3£ ; abdom. lin. 6 + cum lob. 

 apic. lin. 3=lin. 9. 



Hab. In Insulis Philippinensibus. B.M. 



Allied in general form to the preceding species. Ob- 

 scure brown, opake and rugose both on the upper and under 

 sides, finely setose. The head is rather longer than wide, 

 with small tubercular spines between the eyes and on 

 the hind part. The antennas are very short and 16- or 

 1 7-jointed. The prothorax is about the size of the head, 

 with two oblique granulated raised lines ; the hinder mar- 

 gin also tubcrculated. The mesothorax is gradually di- 

 lated, with an elevated tuberculated ridge down the middle ; 

 the lateral margins also granulated, and with lateral curved 

 elevated granulated lines. The metathorax is gradually 

 dilated to the front of the place of insertion of the hind 

 legs, where it is strongly angulated and suddenly narrowed, 

 the hinder division separated from the anterior by a curved 

 impressed line. This portion of the body, as well as the 

 abdomen, is marked down the middle by an elevated tu- 

 bercular carina, and the hind margins of the abdominal 

 segments are armed with larger tubercular spines, the 

 outer posterior angles of each segment being prominent ; 

 the ninth dorsal segment is much depressed and subemar- 

 ginate, exposing the anal lobe resembling an extra segment. 

 The operculum is swollen at the base, and scarcely extends 

 to the extremity of the exposed lobe. The legs are short, 

 the anterior femora curved at the base ; all the femora are 

 armed with small tubercular spines. The mesosternum is flat, 

 with a very fine raised central line, and a row of tubercles 

 on each side, outside of which the mesosternum is angu- 

 lated. The ventral segments of the abdomen are slightly 

 tricarinated along the middle. 



Plate IV. Fig. 3. The female, of the natural size. 3 a. The 

 fifth to the ninth segments .of the abdomen seen sideways. 



18. (146.) Acanthoderus Oileus, Westw. 

 Plate XXVI. fig. 4. 

 Obscurus, griseo-fuscus, luteo-variegatus, depressus ; ca- 

 pitis vertice postice elevato, conico, serie antica duplici tu- 



berculorum triangulum formante ; antennis brevibus ; tho- 

 race inermi, capite parum latiore, lateribus parallelis ; 

 abdominis segmentis carina duplici mediana, sulcisque obli- 

 quis lateralibus ; pedibus hrevibus, subrugosis. 



Long. corp. unc. LJ; cap. lin. If; anten. lin. 4 ; proth. 

 lin. 1| ; mesoth. lin. 3^ ; metath. lin. 3 ; abdom. lin. 5| + 

 lin. 3= lin. 8£. 



Hab. In Insula Java (Dr. Horsfield). In Mus. Soc. 

 Merc. Ind. orient. 



I have seen only one specimen of this species, which 

 appears to me to be a female not arrived at its full growth. 

 The head is small, with the crown elevated behind into a 

 conical protuberance, rugose along its edges ; the anterior 

 part of the face, with two converging rows of tubercles, 

 running from the base of each antennae and meeting in the 

 middle of the face between the eyes. The antennae are 

 short, about 23-jointed, the basal joint robust aud pris- 

 matic, flat above. The prothorax is wider than the head, 

 with the anterior angles rounded ; the disc uneven, with 

 two tubercles near the middle. The meso- and metatho- 

 rax are of equal width throughout, and furnished with an 

 elevated ridge down the middle terminating in the anterior 

 margin of the mesothorax in two prominent tubercles ; the 

 disc and sides are slightly uneven ; the posterior division of 

 the metathorax is very short, with two diverging raised 

 lines in the middle. The abdomen is depressed and has 

 the sides even and continuous, of nearly equal width 

 throughout; the terminal segment narrowed, truncated, 

 and serrated at the extremity ; each segment has two 

 curved elevated lines in the middle, and an oblique impres- 

 sion on each side ; the fifth segment is marked near its 

 base in the middle with two round black spots, the eighth 

 dorsal segment is elevated at its hinder extremity in the 

 middle ; on the under side the body is simple and unanned, 

 with the middle of the thoracic and abdominal segments 

 with a slightly raised longitudinal carina. The operculum 

 is but slightly developed, nearly flat, and extending only 

 to the middle of the eighth dorsal segment. The legs are 

 short, rather thick, and slightly rugose ; the basal joint of 

 the tarsi scarcely longer than the following joint. 



Plate XXVI. Fig. 4. The female (immature ?), of the natu- 

 ral size. 4 a. The head and froDt of the thorax seen side- 

 ways. 4 b. The terminal segments of the abdomen seen 

 sideways. 



19. (147.) Acanthoderus ulula, Westw. 



Plate XXVI. fig. 1, female. 



Fuscus, opacus, rugosus, ferrugineo-granulatus et spi- 



nosus ; capite postice elevato, multispinoso ; antennarum 



articulo basali extus spina parva instructo ; prothorace sub- 



