218 G. F. FERRIS. 



Female with the derm unchitinised except for the pygidium. Margins of the 

 abdominal segments projecting, the last three with three or more gland spines, the 

 margins of both thorax and abdomen and the dorsum of the abdomen with mimerous 

 moderately large ducts. Pygidium (hg. 6) with two pairs of lobes, the median pair 

 rounded, the second pair bilobed. Between the median lobes are two small gland 

 spines ; between the median and second lobes a pore prominence with two projecting 

 points ; beyond the second lobes two small gland spines, two large submarginal 

 pores, two gland spines, two pores, three gland spines and a pore. Margins of the 

 marginal pores heavily chitinised. Dorsal ducts only slightly smaller than the 

 marginal ducts, arranged in three rows as indicated in the figure. 



Genus Pygalataspis, nov. 



Diaspidine Coccidae referable by the character of the ducts to the Diaspis series, 

 that is with the ducts short, relatively broad and with a pair of transverse bars across 

 the inner extremity. Ducts abundant on the pygidium, both dorsally and ventrally, 

 not arranged in rows. Gland spines of the ordinary simple type lacking, being 

 replaced by a series of short, broad, variously toothed plates along the margin of the 

 pygidium, these plates apparently arising in part from the margins of the lobes. 

 Two pairs of lobes or lobe-like processes present, the outer pair not bilobed. Cir- 

 cumgenital pores present in five groups. Scale of both sexes elongate, with the 

 exuviae at one end, that of the female with the dorsal and ventral portions continuous, 

 the ventral scale composed in part of the ventral portion of the second exuviae. 



Type of the genus, Pygalataspis miscanthi, sp. n. 



Notes. — In the abundance and distribution of the ducts and the correlated charac- 

 ters of the scale this genus most closely resembles Odonaspis, but the peculiarly 

 shaped plates and the extraordinarily large lobes are quite unlike anything else with 

 which I am familiar. The genus Odonaspis is usually attached to the Aspidiotus 

 series of the Diaspidinae, but I am inclined to doubt the correctness of this placing, 

 regarding it rather as belonging to the Diaspis series. 



Pygalataspis miscanthi, sp. n. (fig. 7). 



From Miscanthus sinensis (a grass), Taihoku, Formosa. 



Scale of the female about 2-5 mm. long, elongate, white or brownish ; scale of the 

 male similar in form and colour to that of the female, about 1 mm. long. 



Female (fig. 7, B) elongate, with nearly parallel sides, the margins of the abdominal 

 segments projecting but little or not at all, the derm membranous except for the pygi- 

 dium and the lateral margins of the last two or three abdominal segments which are 

 heavily chitinised. Lateral margins of the metathorax, and of all the abdominal 

 segments and the dorsum of the last two segments with numerous ducts of the type 

 shown in fig. 7, D. 



Pygidium (fig. 7, A) with the marginal area heavih^ chitinised and more or less 

 folded. Two pairs of large, rounded lobes or lobe-like processes present, each with 

 a broad, flattened, irregularly toothed plate arising from the outer margin, the plates 

 of the second pair larger than those of the median pair. Beyond the second is a 

 cluster of two or three smaller plates. Setae at the bases of the lobes, both dorsally 

 and ventrally, long and slender. Tubular ducts very abundant, all small, those of 

 the venter confined to a broad marginal zone. Circumgenital pores in five groups of 

 15 or more pores. 



Second stage with the pygidium (fig. 7, C) terminating in a pair of prominent, 

 pointed processes, which bear small plates as in the adult, and with a few small plates 



