1873] GENERA AND SPECIES OF ARANEIDEA. 115 



traceable, though comprising the larger portion of the cephalothorax ; 

 the lower margin of the clypeus is prominent at the middle. Towards 

 the margin of the thoracic portion are some raised points or granu- 

 lations, the lateral margins of the caput being also set with a single 

 line of small prominent points. 



The eyes (four in number, pearly white and of large size) occupy the 

 tubercular eminence which forms the apex of the cephalothorax ; 

 they are contiguous, and form a crescent whose open side is behind : 

 the two foremost eyes are considerably the largest. 



The legs are moderately strong, short, not very unequal in length, 

 and furnished sparingly with hairs ; their relative length appeared 

 to be 1,4, 2, 3. Terminal tarsal claws exist, but their number and 

 exact construction could not be satisfactorily ascertained with the 

 only optical instruments I possess. 



The palpi are short ; radial and cubital joints short, the former 

 strongest ; the digital joint is of a simple oval form, and appeared to 

 have no concavity ; palpal organs very large, simple, and of a some- 

 what irregular pyriform shape, with a longish strong curved black 

 tapering sharp-pointed spine projecting from their extremity. 



Falces moderately strong, of a somewhat conical form, pinched in 

 at their extremities, which are furnished with a small curved fang ; 

 each falx has a long, nearly perpendicular and slightly curved pro- 

 jection at its base ; this projection is equal in length to the rest of 

 the falx. 



Manilla, labium, and sternum {vide characters of the genus). 

 Abdomen rather large, and projecting considerably over the thorax ; 

 it is of a regular oval form, somewhat flattened above, where it is com- 

 pletely encased in a sort of corneous shield : the sides are steep and 

 covered with three longitudinal corneous folds ; these are separate 

 from others, which are transverse on the hinder part, but follow 

 the same linear direction as the lateral ones. The underside 

 is two parts out of three covered by a larger corneous spiracular 

 plate, near behind which the two apertures leading to the spiracles 

 are visible ; and behind them again is another oblong transverse plate 

 of the same nature ; near the lateral margins of these plates, and 

 between them and the lower lateral corneous fold, is a single row of 

 small rudimentary plates, looking like red-brown spots. The spin- 

 ners are four in number, of equal length, and united in a kind of 

 corneous case or sheath of a truncate-cone form, and placed under 

 the end of the abdomen. 



A single adult male of this most remarkable little Spider was 

 contained in a collection of Arachnida received from Ceylon from 

 Mr. J. H. K. Thwaites in 1871. I have not been able to ascer- 

 tain any thing as to its habits or habitat. 



Fam. Palpimanides. 



Nov. gen. Pachypus. 



This genus is very nearly allied to Otiothops (Macleay, Ann. Nat. 

 Hist., Sept, 1838, pi. ii. fig. 5) ; and but for the following differ- 



8* 



