HOrr.OPHORA MAGNA. 557 



posterior margin ; lower edge of aspis undulated, 

 narrowest posteriorly. The aspis is divided into two 

 portions by a transverse line just behind the carina, 

 the front portion is far the larger, and is domed and 

 pitted, the hinder part is band-like, and marked with 

 subparallel curved ridges inclining toward the centre. 

 Mandibles and maxillge very large, palpi showing from 

 the lateral aspect. Pseudo-stigmata close to the lower 

 edge and almost at the back of the aspis. Pseudo- 

 stigmatic organs short and fine, filiform if seen on 

 edge, widest in the middle if seen laterally ; straight 

 just where they emerge from the pseudo-stigmata, but 

 almost immediately curving strongly upward and out- 

 ward, so as to be sickle-shaped. The three short 

 tubular air-sacs inside the pseudo-stigmata are figured 

 at PI. D, fig. 14. There are a pair of setiform hairs on 

 the highest part of the aspis, and one on each side of 

 the carina. 



Legs rather long for the genus ; the femora of the 

 first two pairs long and thinner than the genuals and 

 tibisG if seen from above ; femora of the two hind pairs 

 shorter. Tactile hairs on first pair of legs very long ; 

 tarsi thickly clothed with long fine hairs, a few similar 

 hairs on the other joints. Claws very large. Mono- 

 dactyle. 



Abdomen a long oval, truncated anteriorly, rounded 

 posteriorly, curving down to the cephalothorax ; pro- 

 gaster not furnished with any chitinous, shelf-like pro- 

 jection overhanging the cephalothorax. Posterior 

 margin of the notogaster much returned on to the 

 ventral surface, where its edge forms a small median 

 projection behind the anal plates. Genital and anal 

 plates large, approaching square, about equal in size, 

 but the genital are rather the wider, and the anal 

 plates rather the longer; three or four long hairs 

 generally project between these plates. There are two 

 rows of long rod-like hairs on the notogaster, and two 

 rows of smaller similar hairs along each side of the 

 abdomen. 



