434 BRITISH OlilBATlDiE. 



Colour pale yellow or yellowisli-wLite ; rostrum and 

 legs red or pinkish. Almost the whole dorsal surface 

 is ordinarily concealed by a great, almost globular, 

 mass of mud and debris. 



Texture leathery. 



Cephalothorax rather small. Rostrum curved down- 

 ward, pointed. Rostral hairs curved, thick, black. 

 There are another pair of larger similar hairs on the 

 frons, doubtless the homologues of those of the adult. 

 Pseudo-stigmata very projecting and cup-like. Pseudo- 

 stigmatic organs long, filiform, doubly curved, i. e. 

 with a tendency to an S-shape. 



Legs long, but not specially so for the genus ; first 

 three joints of about even thickness throughout ; tibise 

 slightly clavate; tarsi with inversely ovate proximal and 

 elongated distal ends (they are somewhat foreshortened 

 in the drawing) ; each joint bears an irregular whorl of 

 stiff, almost straight spines, of which the outer are the 

 longest. 



Abdomen. — The dorsal portion of this part of the 

 body is usually entirely hidden by the dirt with which 

 it is coated ; when clean it is seen to be much arched, 

 somewhat oval, and to have two very small points 

 posteriorly from which spring long flexible jet-black 

 hairs ; there are two longitudinal rows of similar hairs 

 on the notogaster not quite so long, and some round 

 the edge, and a long, flexible, almost median process of 

 th.e cuticle, which is not exactly a hair but rather 

 thick at the base. 



Larva. 



Similar to the nymph, but of course hexapod ; it is 

 almost colourless, and the black hairs on the notogaster 

 are much larger in proportion to the size of the creature 

 than in the nymph. See Fig. 3, where it is shown in 

 the act of escaping from the egg. This drawing shows 

 how the long legs and hairs are packed. The larva 

 is figured by Haller, ' Zeit. wiss. Zool.,' Bd. xxxiv. 



