198 Transactions of the Society. 



Eremeus oblongus. Koch. 

 Nymj)h, PI. V. Fig. 1. 



This is prohahly what is described and figured by Koch as a 

 separate species under the name of Murcia ohsoleta, fasc. 31, 

 pi. 23, but his description and drawing do not admit of certainty. 



Colour light ochre brown; the creature in life has rather a 

 metalhc look. 



The visible part of the cephalotliorax is not above a fourth of 

 the whole length of the creature, but the hind part is sunk and 

 hidden beneath the anterior margin of the abdomen. The rostrum 

 rather narrow, bluntly pointed, and bearing two fine curved hairs 

 on its front margin. There is a sharp indentation above the inser- 

 tion of the first pair of legs ; thence the cephalothorax widens 

 suddenly, but is again sharply indented above the second pair of 

 legs. The vertex bears the two longitudinal ridges so conspicuous 

 in the perfect creature, and there are a few cross markings between 

 them. Stigmata projecting, rather wide apart, and pointing upward 

 and backward. Stigmatic hairs long, very fine where they emerge 

 from the stigmata, but gradually thickening, and ending in lanceo- 

 late clubs with pointed ends. Interstigmatic hairs shorter than 

 stigmatic, straight, and inserted close to the abdomen. 



Legs: fourth pair about reaching the posterior margin; the 

 two front pairs thicker than the others, with the coxae very small, 

 the trochanters conspicuously large, flat on the inside and bowed on 

 the outside. The femurs are small in all the legs ; in the two hind 

 pairs the coxae are large and flattened, and the trochanters propor- 

 tionately diminished. The fourth joints of these hind pairs are thin, 

 especially at the proximal ends. All the trochanters bear a re- 

 markable knifeblade-like chitinous ridge on their upper and lower 

 inner edges, most of the upper ones being serrated. There is a 

 similar deeply serrated ridge on the upper edge of each coxa of the 

 fourth pair of legs. The claws are long and thin, the curves 

 open. A rough hair springs from inside the proximal end of the 

 ridge on each trochanter, and another further forward on the first 

 two pairs. There are some fine hairs on the lower joints of the 

 legs, those on the tarsi being as usual most numerous. 



The abdomen shield-shaped, but sharply narrowed at the anterior 

 margin, where it bears a row of hairs curving backward. The cast 

 notogastral skins are carried not concentrically, but the centre of 

 each nymphal skin a little further back than the centre of the one 

 that underlies it ; thus each upper shield projects a little beyond 

 that below it at the posterior margin ; the larval skin, however, is 

 placed centrally upon the first nymphal skin. The skins are all 

 rough and spotted on the anterior margin, and corrugated at the 



