132 Chionaspis. 



CHIONASPIS HERB^, Sp. nov. 

 (Plate XLIII.) 



Female puparium silky white, or dull white. Second pellicle in some 

 examples yellowish, in others reddish brown ; always partially obscured by a 

 thin layer of the white secretion. Moderately convex. Form varying in 

 examples occurring on dififerent species of grass. In specimens from Panicum 

 the scale is dilated behind {fig. 3) ; in others from IschcEimwi ciliare the scale 

 IS broad in front and distinctly narrowed behind {fig. 2). Intermediate forms 

 occur on other grasses. The ventral scale is moderately well developed, and 

 may either come away with the dorsal parts of the puparium {fig. 4), or remain 

 attached to the plant, this difference depending upon the nature of the surface 

 upon which the scale has been formed. Length 2 to 275 mm. Breadth 075 

 to 1-25 mm. 



Male puparium {fig, 5) snowy white ; of normal form ; sides parallel ; feebly 

 tricarinate. Length 1-25 mm. 



Adult female {fig. 6) bright yellow ; older examples tinged with red. 

 Metathorax and first abdominal segment (in fresh living examples) abruptly 

 narrowed ; lateral margin of second abdominal segment conspicuously produced 

 (This character is not so noticeable in mounted specimens). Both pairs of 

 spiracles with conspicuous parastigmatic glands. A scattered series of hair-like 

 spines along the margin of the body. Second abdominal segment with from 

 ten to twelve stout spiniform squames on each side, and third segment with four 

 or five ; both these segments with dorsal series of oval pores. Pygidium bluntly 

 pointed or rounded. Lobes not very prominent ; almost concealed above by 

 irregularities of the margin {fig. 8) ; more conspicuous in younger examples 

 and viewed from the under surface {fig. 9). Median lobes much broader than 

 long, divergent, not serrate, bluntly pointed towards the outer edge. Second 

 and third lobes duplex, the mesal lobule largest, each lobule bluntly pointed 

 towards the inner edge. Squames spiniform : one or two on first and second 

 spaces ; one on third and fourth spaces ; three or four on base. Conspicuous 

 series of dorsal pores on third, fourth, and basal spaces, the inner series 

 consisting of three or four pores close to the circumgenital glands. On the 

 ventral surface are short series of much smaller oval pores, starting from the 

 margin of second, third, and fourth spaces, and connected with small capitate 

 ducts. There are also numerous small circular pores, with accompanying ducts, 

 scattered over the general surface of the body, both dorsally and ventrally. 

 The grandular scars on pygidium and penultimate segment very conspicuous. 

 Circumgenital glands in five groups : median, 18 to 21 ; upper laterals, '^ii to 

 47 ; lower laterals, 31 to 39. Anal slightly anterior to genital aperture. Length 

 I to I '50 mm. Breadth 0*50 to 075 mm. 



Living females, removed from their scales, soon commence to secrete 



