MOUNT Et)llAIMA IN BRITISH GUIANA. 



65 



Anal sternite triangularly pointed ; sternum of eighteenth somite wider behind than the 

 length of the coxae of the last pair of legs. Copulatory limbs as in fig. 1, the basal 

 segment armed externally with a large downwardly-directed conical process; second 

 segment furnished with numerous thickly-set short hairs on the inner side at the base 

 and externally with many long bristles ; giving off distally two long processes, an upper 

 and a lower, directed obliqiiely forwards and downwards ; the upper process runs forwards 



Fia;. 1. 



Odontopeltis Macconnelli, sp. n. 

 (I. Lower view of left copulatory leg. h. Lateral view of external surface of right copulatory leg. 



and downwards with a slight curve, then turns sharply externally, and ends in a sharp 

 tip curving upwards and forwards ; the inferior process is laminate, but narrower at base 

 and distally than in middle, with a slight sigmoid flexure when seen from the side ; seen 

 from below its inner edge is directed straight forwards in its basal third, then obliquely 

 forwards and outwards, the outer edge being convex ; distally the process ends in two 

 sharp prongs — an inner straighter and an outer semicircularly curved forwards. 



2 . Stouter than male, with smaller keels. 



rf . Total length 4.3 mm. ; width 6. 



S . » 43 „ ; „ 7. 



Loc. Summit of Roraima, 8600 feet alt. 



Genus Euryurus, C. Koch. 



EURYURUS ATRATUS, Sp. n. 



2 . Colour : dorsal area a uniform black, ventral area a little paler. Head with a 

 smooth, oval, pale-coloured prominence in the middle line just between and below the 

 antennae ; a curved row of six setal pores above the labrum. Dorsal area smooth and 

 polished. Keel of second somite laterally emarginate, leaving the anterior imd posterior 

 angle acute and subdentate ; lateral margin of keel of third and fourth somites with a notch 

 behind the anterior angle, which is thus subdentate; remaining keels with posterior 

 margin finely serrulate, concave ; angle acute and becoming more and more acute and 

 produced in the posterior region of the body ; lateral margin of keels even, slightly 



