110 Transactions. — Zoology. 



keel only extending to the middle of the third segment. 

 Median segment areolated completely ; spiracles small, 

 oval. Petiole slender, not much dilated at the apex. Scu- 

 tellum large, not much raised ; keeled at the base only ; the 

 basal depression semicircular. 



The apex of the clypeus is bluntly rounded ; the foveas 

 large. Mandibles with unequal teeth ; the tarsi without, or 

 almost without, spines, of normal length and thickness ; claws 

 short, simple. Eadial cellule wide ; the apical obscissa of the 

 radius straight ; transverse median nervure received in front 

 of the transverse basal ; the furrows on the base of the meso- 

 notum distinct, the sides of the post-scutellum deeply foveate 

 at the base. 



Colobacis, gen. nov. 



Antennas short and thick, tapering towards the apex ; the 

 joints of the flagellum short ; the basal about twice longer 

 than broad ; the apical and middle broader than long. Occi- 

 put margined. The eyes surrounded by a distinct furrow. 

 Clypeal foveas large. Mandibles with a large upper and a 

 smaller lower tooth ; the upper tooth elongate, narrowed and 

 rounded at the apex. Scutellum flat, large, its sides not 

 margined. Post-scutellum depressed laterally at the base, the 

 sides bordered with a keel. The areas on the median segment 

 all distinctly defined ; the lateral tooth large. Spiracles elon- 

 gate, linear. Areolet five-angled, narrowed above ; the base 

 of the cubital and the recurrent nervure with a short nervure ; 

 the transverse median nervure received distinctly beyond the 

 basal. Abdomen with seven dorsal segments ; the ventral keel 

 extending to the apex of the fourth segment ; the apical 

 segments bluntly rounded, more broadly and bluntly than 

 in Amblyteles. Post-petiole broadly dilated ; its apex with 

 three shallow depressions ; the apical ventral segment largely 

 triangularly incised. Ovipositor short. 



The obtusely pointed abdomen places this genus in the 

 Amblypygi. Prom Amblyteles it may be separated by the 

 much wider post-petiole, by the broader-pointed more ovate 

 abdomen ; the antennas are shorter and thicker ; the basal 

 obscissa of the cubitus is more sharply angled. The post- 

 petiole is even broader than in the other section of the group 

 (Platylabrus and Eurylabrus) , from which it differs further in 

 the shorter and thicker antennas, with the joints shorter com- 

 pared to their width. 



Colobacis forticornis, sp. nov. 



Niger, pedibus abdominis segmento secundo rufis ; pedibus 

 runs ; coxis, trochanteribusque posticis, nigris ; alis fulvo- 

 hyalinis, stigmate costaque fulvis, nervis nigris. ? . 



Long., 14 mm. 



