444 Monophlebmce. 



WALKERIANA, Sigtu 

 Walkenana, Signoret, Ami. Soc. Ent. Fr. (5), Vol. V. p. 390 (1S75), 



The species of this genus are all of large size, broadly ovate and usually 

 strongly convex above. The dorsum bears symmetrical series of stout, dense, 

 but brittle processes which are of a chalky rather than waxy consistency. In 

 some species (notably in the type species— /^07-/oe;) the spaces between these 

 processes are occupied by fine, glassy, or silky filaments. The adult female 

 has ten-jointed antennic. The limbs are strongly developed, and usually dark- 

 coloured. The anal orifice is masked by a more or less crowded group of 

 long, stout setne. There are usually three or more large cicatrices on the 

 venter, immediately behind the genital orifice. The dermal pores are large 

 and conspicuous, often varying markedly in size and structure on different 

 areas of the body (e.g. floriger and ovilla). The ceriferous tracts are usually 

 outlined by a series of special pores. The derm bears numerous setje, which 

 are more densely crowded on the ceriferous tracts. The setc^ are of various 

 forms ; those on the dorsum being stout and spiniform, or sometimes ampulli- 

 form ; those on the ceriferous tracts often differing in form from those on the 

 intermediate areas. Abdominal spiracles are present, but difficult to locate. 

 Morrison has observed seven pairs in species that he has examined. The 

 development of a well-defined ovisac (as in senex) appears to be exceptional. 



Adult male unknown, but probably of similar structure to the males of the 

 closely allied genera Aspidoprocttts and Labioproctus, in which the abdomen 

 terminates in a single pair of fleshy appendages, and the antennal joints are 

 tri-nodose. 



Larva; with five-jointed antennre, the body clothed with very long, glassy, 

 or silky filaments. 



It is probable that insects of this genus are of slow development and 

 relatively long-lived. 



Synopsis of Ceylon Species. 



A. Calcareous processes of adult female almost concealed by masses 



of silky filaments floriger. 



B. Processes conspicuous and exposed. 



(ci) Spiniform sette of dorsum with apices blunt or slightly 



expanded compact a. 



ip) Spiniform sette of dorsum acutely pointed. 



(a') Dermal pores not markedly differing in size ; ova con- 

 tained in a well-developed ovisac scnex. 



(d^) Large conspicuously rosette-shaped pores intermingled 



with smaller pores ; no definite ovisac ovilla. 



