406 BRITISH OIUBATIDiE. 



The Pseudo-stigmatic organs most commonly long 

 and rod-like or spine-like ; rarely clavate. 



The Interlamellar hairs most frequently thick and 

 curved, or rod-like ; frequently there is a smaller hair 

 on the outside of the pseudo-stigma. 



The Tectopedia can hardly be said to exist in the 

 genus, unless the strong, solid, chitinous projections 

 between the first and second, second and third, and 

 third and fourth pairs of legs in some species be con- 

 sidered to represent them ; the second, third, and 

 fourth legs are actually articulated to these projections 

 in many species, and they form a very conspicuous 

 feature in such forms as D. geniculatus and D. clavipes ; 

 PL XXXIX, fig. 1; PI. XXXVIII, fig. 1. 



The Legs always long and slender, usually much 

 longer than the body ; sometimes of extreme length 

 (D. clavi^pes ; D. tenuipes). Joints always clavate or 

 moniliform, the femora in particular having very thin 

 proximal ends ; tarsi generally long and thin, often 

 curiously twisted or undulated (PI. XXXVI, fig. 9 ; 

 PI. XXXIX, fig. 9). Claws large and monodactyle in 

 all species yet found in England, but tridactyle in 

 some Italian species. 



The Abdomen generally almost globular, occasionally 

 more elongated ; almost always with two longitudinal 

 rows of hairs on the notogaster ; these are usually thick 

 and rod-like ; they may be smaller and more curved 

 (i). verticillipes), or may be very fine and recurved or 

 hooked (D. auritus) or of other forms. 



The Genital and Anal Plates usually near together 

 (from the form of the abdomen) and rather square, 

 the former generally the larger. 



The Tracheal system very well developed (PL D, 

 figs. 6, 7, 8, 9, 10, 17.) 



The Alimentary Canal usually has the ingluvies 

 Yevy large and well-marked, with powerful circular 

 muscles, but with the C£eca of the ventriculus absent, 

 or forming mere corners to that organ (PL E, figs. 4 

 and 5). 



