FALKLAND ISLAND SPIDERS. 41 



anrl two smaller ones at the rear end. It overhangs the cephalo- 

 thorax almost to the end of tlie cephalic part. 



The measurements (in millimetres) are as follows :— 



Long. Bvoad. 



/-( 1 1 J.1 ^ f 1# in front. 



Cephalothorax ... 4 ^ o 



Abdomen 4| 3| 



Mandibles 1| 



Pat. & Metat. 

 Coxa. Tr. &fem. tib. & tars. 



Legs 1. 1 4 4i 4 = ISi 



2. I 4 4 4 = 12| 



3. I 21 2 2| = 7^ 



4. I 4 'S 3i = Hi 

 Palpi ^ 1 i 2| = 4A 



There is one male specimen. 



An undeveloped female, similarly coloured, has the rear and 

 side prominences much more prominent, and a pale median 

 longitudinal streak down the abdomen on the upper side. 



Subfamily Tetragnathin^e. 

 Genus Tetragnatha Latreille. 

 Tetragxatha insulata, sp. n. (PI. II. figs. 6 rt-6 e.) 



Female. The cephalothorax, mandibles, legs, and palpi pale 

 yellow, the hairing on the latter dark grey; the eyes black, the 

 laterals on black tubercles and black patches behind the rear 

 median. The sternum nearly black at the edges, but yellow in the 

 central streak, with dark grey hair. The abdomen is uniformly 

 dark yellow-grey all over, with dark grey hair. 



The cephalotJwrax is longer than broad, the cephalic part being 

 raised and divided off from the thoracic by distinct depressions. 



The ei/es are all equal in size. Both the front and rear row 

 are recurved, the laterals being as far apart from each other as 

 the front and rear medians. The rear median are 1| diameters 

 apart and 2g from the laterals. The front median are one 

 diameter apart, Ig diameters from those of the rear row, and 

 3 from their laterals. The front median eyes are one diameter 

 distant from the margin of the clypeus. 



The mandible in the female has on the inner margin of the 

 falx-sheath one tooth at the upper end and two teeth at the 

 lower end, about the level of the top of the maxillae ; on the 

 outer margin thei-e is one tooth at the upper end, and two at 

 the lower end below those on the inner margin. 



In the male there are eight teeth on the inner margin of the 

 falx-sheath. Near the upper end of the outer margin are two 

 much larger teeth, of which the second is the longest, and then 



