332 REV. O. p. CAMBRIDGE ON SPIDERS [Apr. 20, 



digital joint is small ; the palpal organs rather complex but com- 

 pact. 



Argyrodes amboinensis appears to be an abundant species in 

 Amboina, and is perhaps the finest and handsomest yet knovvn of 

 this group ; it is certainly one of the most distinct with respect to the 

 form of the caput, 



I am indebted to Dr. Thorell for the examples from which my 

 figures and the above notes have been made. 



Argyrodes scintillulana, sp. n. (Plate XXIX. fig. 10.) 



Length of the adult male | line, and of the female 1| to 1|. 



The cephalothorax is of a deep brown colour ; the fore part of the 

 lower part of the caput is produced into a strong, prominent pro- 

 jection, which tapers gradually to a point, and, looked at in profile, 

 has a slightly upward direction, being also furnished with prominent 

 bristly hairs. 



The legs are very slender; their relative length is 1, 2, 4, 3 ; those 

 of the first pair are greatly the longest, being nearly four times the 

 length of the Spider itself; they are of a pale yellow-brown hue, 

 and furnished with short fine hairs. 



The j}alpi are short, similar in colour to the legs ; the radial and 

 cubital joints are very short ; the digital joint is also small, oval; 

 and the palpal organs are compact, not very complex, and have a 

 short, curved, spine-like process at their extremity, with a longer, 

 curved transverse spine just behind it. 



The falces are moderate in length and strength, and, with the 

 maxillae, which are of normal form, are similar in colour to the 

 cephalotliorax, the labium and sternum (also of normal form) being 

 of a darker colour. 



The abdomen is of a deep brownish sooty-black hue ; the posterior 

 extremity is greatly produced, ending in an obtuse and nearly round 

 form. The profile forms an evenly ascending line from the fore to 

 the hinder extremity ; and the spinners are placed at an angle nearer 

 to the former than to the latter. Looked at from above and behind,' 

 the upperside is marked with two oblique pale stripes on each side 

 on the hinder half; each stripe is charged with a row of irregular 

 silvery spots which sparkle like diamonds in different lights. When 

 looked at in profile there are, besides the stripes of sparkling spots just 

 noted, on each side, at the fore extremity, a shorter horizontal stripe 

 of a similar kind, and a bold round sparkling silvery spot just 

 above the spinners ; near the middle of the underside, in a transverse 

 line, there are also two other rather larger round spots of the same 

 kind, and another just beneath the hinder extremity of the pro- 

 duced part. 



The abdomen of the female is larger, but less long in proportion, 

 its hinder extremity scarcely so obtuse, and sometimes of a cyliudric 

 form. The colours and markings of this sex, however, are the same 

 as those of the male. 



Adidts of both sexes of this beautiful little Spider were received 

 from Mr. 6. H. K. Thwaites, from Ceylon, where they occur in the 



