52 



CATALOGUE OF ORTIIOPTEROUS INSECTS. 



15. (l-^S.) Acanthoderus Gecko, Westw. 

 Plate XXVI. fig. 6, male ; fig. 7, female. 



Fuscus, opacus, ferrugineo-grauulosus et spinosus ; cor- 

 pore maris minus granuloso ; capite brevi-spinoso ; pro- 

 thorace carinis duabus convergentibus granulatis spinis- 

 que duabus validis autice instructo ; mesothoracc spinoso, 

 spinis duabus maximis divergentibus aute medium, duabus 

 minoribus erectis poue medium approximatis alterisque 

 duabus lateralibus ; metathoiace utrinque prope medium 

 duabus validis poirectis ; abdomine maris subtevi, fceminse 

 granulate ; pedibus mediocribus, femoribus spiuosis (mas 

 et foem.). 



Long. Corp. maris lin. 18 ; capit. lin. 2 ; proth. lin. 2 ; 

 mesoth. lin. 4 ; metath. lin. 2| ; abdom. lin. 6^+lin. 2= 

 lin. 8|. 



Long. Corp. fuem. lin. 27 ; capit. lin. 2^ ; proth. lin. 2^; 

 mesoth. lin. 5J ; metath. lin. 3 ; abdom. Im. 9 + lin. 5 = 

 lin. 14. 



Hab. Sarawak, Borneo (D. 77 a/;«ee). Mus. Saunders & 



B.M. 



This species is well distinguished by the two large com- 

 pound spines on the prothorax, and by the large triangular 

 strongly spined space on each side of the anterior part of 

 the mesothorax. The general colour is brownish- black in 

 the male, with the spines and central line down the thorax 

 ferruginous. The female is ferruginous brown, with the 

 abdomen darker coloured, the spines and small tubercles 

 being more ferruginous. The male has the body much 

 less rugose, but with the spines more acute ; the female is 

 covered with small granules, and the mesothorax has the 

 triangular lobe on each side more dilated, ilattened, and 

 spined than in the male. The head is nearly square, with 

 two strong spines ou the crown behind the middle, with 

 several smaller tubercular spines. The anterior lateral 

 angles of the prothorax are spiracular, surmounted by a 

 small spine ; the disc on each side is armed with a strong, 

 obliquely erect, bifid spine, each followed, in the female, by 

 a row of small tuberculiform spines. The mesothorax has 

 a transverse row of small spines across the base ; the flanks 

 are aimed with a row of about six small spines ; the disc in 

 the male is armed on each side near the front with a strono- 

 spine, beyond the middle with a pair of erect approxima- 

 ting spines, and another pair above the insertion of the 

 middle leg. Along the middle both of the meso- and meta- 

 thorax runs a slender, slightly elevated, ferruginous line ; 

 the flanks of the metathorax are also spined, and the disc of 

 the anterior portion is armed with a pair of strong, obliquely 

 erect spines. In the female the spines become more com- 

 pound, the anterior pair of the mesothorax being united to- 



gether, and to the two middle spines, by a raised transverse 

 lozenge-shaped space, with the edges serrated ; the dis- 

 coidal carina is furnished with two rows of small tubercles. 

 The thorax beneath is unarmed. The abdomen is consi- 

 derably narrower than the metathorax ; the segments are 

 nearly square in the male and very finely rugose, but trans- 

 verse in the female and finely granular, with a transverse 

 ridge of tubercles near the hind margin. The terminal seg- 

 ments of the abdomen in the male are but little swollen ; 

 the terminal dorsal segment slightly emarginate in the 

 middle, and the last ventral segment rounded at its extre- 

 mity ; the terminal dorsal segment in the female is cari- 

 nated, with an impressed line running down the middle of 

 the carina ; the operculum large, but not extending beyond 

 the extremity of the abdomen. The legs are moderately 

 long in the male, shorter and stronger in the female ; the 

 femora, especially in the latter, are armed with small spines 

 on the upper edges ; the under edge in the four posterior 

 femora armed with two spines towards the tip ; the tibiae 

 are rugose rather than spined; the tarsi are short, with 

 the basal joint small. 



Plate XXVI. Fig. 6. The male, of the natural size. 6 a. 

 The head and prothorax seen sideways. 6 b. The termi- 

 nal segments of the abdomen seen sideways. 



Fig. 7. The female, of the natural size. 7 a- The head, protho- 

 rax and mesothorax seen sideways. 7 b. The terminal seg- 

 ments of the abdomen seen sideways. 



16. (144.) Acanthoderus deplanatns, Westw. 



Apterus, planus, thorace e capite ad pedes posticos sensim 

 dilatato ; ferrugineo- fuscus, opacus, granulosus ; capite pos- 

 tice spinis 6 aliisque lateralibus parvis armato ; protho- 

 race antice utrinque tuberculo piano spinoso armato ; me- 

 sothoracc antice area parum elevata utrinque angulata, 

 lateribus postiee convergentibus instructo, marginibus gra- 

 nulosis spmisque duabus supra pedes medios armato ; me- 

 tathorace etiam spinis 4 supra pedes posticos utrinque 

 armato, hoc cum mesothorace et abdomine carina media 

 longitudinali parum elevata instructo ; segmentis basalibus 

 abdominis serie transversa spinarum parvarum versus mar- 

 ginem j)osticum armatis ; pedibus brevibus, spinosis 

 (foem.). 



Long. Corp. foem. unc. 2\; cap. lin. .3 ; proth. lin. 3 ; 

 mesoth. lin. 5 1 ; metath. Un. 4 ; abdom. lin. 1 1 -|- cum lob. 

 apic. lin. 5:=lin. 10. 



Phasma (Pachymorpha) dcplanatum, Westw. Cab. Orient. 

 Eiit. p. 78. pi. 38. f. 6. 



Hub. In Insulis Philippinensibus (D. Cuming). B.M. 



