PHASMID.E. ACANTHODERUS. 



55 



capitB lobis duobus spinulosis verticalibus ; prothorace 

 spinoso ; mesothorace ante medium utrinque lobo trian- 

 gulari spinuloso (in mare apice acutiori) armato ; metatho- 

 race necnon scgmentis sex basalibus abdominis lobis duobus 

 parvis spinulosis in fosmina, spinisque duabus metatho- 

 racis et segmentorum duorum basalium in mare armatis ; 

 segmentis tribus ultimis abdominis dilatatis ; pedibus tu- 

 berculato-spinosis. 



Long. corp. maris unc. 1£ ; cap. lin. 2; proth. lin. If; 

 mesoth. lin. 3 ; metath. lin. 2\ ; abdom. lin. G + lin. 3J 

 =lin. 9}. 



Long. corp. foem. lin. 20 ; cap. lin. 2 ; proth. lin. 2 ; 

 mesoth. lin. 3 ; metath. lin. 3 ; abdom. lin. 7 + lin. 4 = 

 lin. 11. 



Hab. In Columbia. In Mus. Guerinii, Parisiis. 



This is one of the most repulsive-looking species in the 

 entire family, owing to its uniform dirty brown colour and 

 strongly armed appearance. The male is considerably nar- 

 rower than the female, and the spinulose lobes upon the 

 different parts of the body are more elongated, terminating 

 in longer and more acute spines. The head is short, with 

 the face deflexed ; it is rugose, and armed with two strong 

 denticulated lobes on the crown, behind which are two 

 smaller spines. The antennae are long and slender, with 

 long joints. The prothorax is transverse, armed with two 

 spines in front and two smaller behind. The mesothorax 

 is oblong in the male, nearly square in the female ; it has 

 two small spines near together in front, and two large trian- 

 gular denticulated lobes at the sides, with two small spines 

 behind in the middle ; it is also spined along the edges. 

 The metathorax is shorter than broad in the female, with 

 a pair of small triangular denticulated lobes in front (pro- 

 duced in the male into acute spines) ; the middle is cari- 

 nated, and the sides are dilated into triangular spinose 

 lobes. The abdomen is rugose, serrated along the edges, 

 narrower in the male, broad in the female : the first and 

 second segments in the male with a pair of spines, and the 

 fifth and sixth with two small denticulated lobes ; in the 

 female all the six basal segments have a pair of denticu- 

 lated lobes, those on the second and third segments being 

 the smallest, and those on the fifth largest, subovate and 

 denticulated ; the three terminal segments are broadly di- 

 lated, the last joint erect in the male, terminating in two 

 small rounded lateral lobes in the female. The legs of the 

 male are longer and more slender than those of the female. 

 All the femora and tibise are furnished with numerous 

 small obtuse tubercles, arranged in pairs on the femora. 

 The tarsi are short, with the basal joint scarcely larger than 

 the following joint. (The under side of the terminal seg- 



ment had been devoured by Anthreni in the only two speci- 

 mens which I have seen.) 



Plate XXVI. Fig. 10. The male, of the natural size. 10 a. 



The profile of the body. 

 Fig. 11. The female, of the natural size. 



22. (150.) Acanthoderus Mimas, Westw. 

 Plate I. fig. 3. 



Mediocriter elongatus, corpore pedibusque spinosissimis ; 

 fuscus, latcribus luteo parum variegatis ; pedibus pallide 

 luteis fusco variis ; meso- et metathorace ad apicem dila- 

 tatis ; femoribus ante apicem foliolo-dentatis ; tibiisque 

 omnibus intus ante medium foliolo conico parvo instruetis 

 (mas). 



Long. corp. maris lin. 18J ; anten. lin. 12 ; proth. lin. 1 ; 

 mesoth. lin. 5; metath. lin. 3^; abdom. lin. 7 + lin. \\— 

 lin. 8|. 



Hab. Ceylon. B.M. 



The head of the unique male in the National Collection 

 is small and armed with six erect spines arranged in pairs. 

 The antennae are long and slender, the labrum and mandi- 

 bles pale buff, the latter black at the transverse tips ; the 

 general colour of the body is brown, slightly varied at the 

 sides with pale buff. The mesosternum armed with two 

 or three small deflexed spines at each side. The prothorax 

 is armed at the base of each fore leg with two divergent 

 spines. The mesothorax is armed with two compound 

 spines on each side, and with several erect and diverging 

 spines arranged across its dilated hinder part ; there is also 

 a similar arrangement of spines across the dilated hind 

 part of the metathorax ; each of the six basal segments of 

 the abdomen is also dilated at its extremity, where it is 

 armed in the same manner with spines ; each of these ab- 

 dominal segments has likewise the hinder margin beneath 

 produced in the middle into two small contiguous lobes ; 

 the three terminal segments in the male are short, bent 

 upwards and dilated beneath, the seventh being armed with 

 a deflexed spine, as well as the under edge of the swollen 

 operculum. The legs are pale buff, considerably varie- 

 gated with brown ; the femora of the two fore legs have 

 two middle triangular foliaceous lobes on the inside, the 

 four hinder femora being more strongly spined both along 

 the front and hind edge, and all the tibiae have a small 

 lobe on the inner edge between the base and middle. 



Plate I. Fig. 3. The male, of the natural size. 3 a. The 

 same seen sideways without the limbs. 3 b. The four ter- 

 minal segments of the abdomen seen sideways. 



