62 PROCEEDINGS or THE NATIONAL, MUSEUM. vol.60. 



apical setae, unequal in leng-th^ but one much longer, on each, ven- 

 tral ridge placed along the outer edge of each plate, curving with 

 the outline, bearing four setae at wide intervals, the two anterior 

 ones quite long; apparently without fringe or hypopygial setae; anal 

 ring placed some distance anterior to the plates, small, oval, stout, 

 bearing pores and apparently eight large setae. 



Intermediate stage female. — No material available (Maskell's 2nd 

 stage female, in the opinion of the writers, nothing more than a 

 badly parasitized adult female). 



Larva. — Elongate, broadest in thoracic region, head rounded, taper- 

 ing gradually behind, apex of abdomen rounded; antennae long and 

 slender, 6-segmented, the terminal segment very long; legs ver}' 

 slender, digitules slender, knobbed, one of the tarsal inserted much 

 above the other, the latter smaller, claw with denticle near tip; men- 

 tum very short triangular, 1-segmented ; spiracular spines in threes, 

 the median larger, all stout, bluntly rounded at apices; marginal 

 spines very minute if present at all; with five long, slender sub- 

 marginal tubular ducts on each side of the bod}', and with three or 

 four pairs of much larger and relatively stouter tubular ducts in a 

 median row, one pair before the mouthparts, one pair behind, and one 

 or two pairs on the anterior portion of the abdomen, all dorsal ; anal 

 piates slender, not reticulated, bearing a long apical seta about half 

 the length of the body, one outer and two inner curved and two 

 ventral straight much smaller slender setae ; also with a pair of much 

 larger submedian ventral setae anterior to the anal ring; anal ring 

 with pores and six setae. 



Besides the type, four species have been placed in this genus. Of 

 these, Ceronema dryandrae Fuller is described as being very similar 

 to hanksiae^ and can probably remain in the genus ; C. caudata Frog- 

 gatt might from its similar superficial appearance, and from the 

 analogy of identical general distribution, easily be congeneric with 

 hanksiae.) but the description gives only the external appearance of 

 the insect, omitting morphological details entirely, so no definite 

 statement on its proper position is possible. An examination of the 

 type specimens (slides) of C. japonica Maskell shows that the double 

 anal plates remarked on by the describer are due to his having pre- 

 pared mounts from preadult individuals just ready to moult. On 

 account of the condition of these specimens, it is difficult to comment 

 accurately on the generic affinities of the species. It does not appear 

 to be congeneric with C. hanksiae in morphological characters, the 

 chief differences lying in the marginal and spiracular sjjines and the 

 anal plates, in the older stages, and in the more oval shape, the much 

 shorter and stouter legs and antennae and the absence of large tubular 

 ducts in the larva of C. ja'ponica. A similar comment appears to 

 apply to C. koeheli Green, in so far as this can be determined from 



