AULACASPIS (DIASPIS) PENTAGONA. 175 



tremity. All segments strongly indicated. Rudimen- 

 tary antennas narrowly separated ; have a single stout 

 hair. Anterior spiracles with fifteen to seventeen 

 parastigmatic glands. Pygidium (Fig. 20) with five 

 large groups of circumgenital glands, which vary 

 considerably in number. Formula of twelve examples : 



11 8 13 9 6 10 

 2321 . 1418 . 3223 . 1724 . 1515 . 2726 

 1923 . 1717 . 2125 . 1716 . 1512 . 2826 



12 13 9 12 7 10 

 2021 . 2629 . 1716 . 2424 . 1518 . 2321 

 2121 . 3027 . 1717 . 2123 . 1915 . 2527 



Dorsal tubular spinnerets in four subdorsal linear 

 groups, forming two interrupted arches on the lines of 

 the articulation of the segments, and there are similar 

 groups on the succeeding segments. Anal and vaginal 

 openings opposite. Median pair of lobes large, some- 

 what triangular, with both margins deeply and usually 

 evenly notched ; second pair of lobes small, apex 

 rounded and entire. There are three pairs of con- 

 spicuous and rounded projecting pores, and a single 

 one between the median and second lobes much smaller, 

 and having a spine-like projection. Plates strong, 

 spine-like, are usually entire, but occasionally they are 

 divided at the extremity ; they usually number about 

 twelve on each side of the meson. Spines long and 

 slender, except the median pair, which are minute. 



Puparium of the male (Fig. 19, C) faintly tricarinate ; 

 white. 



Long. '75 1 mm. 



Habitat. On Prunus pseudo-cerasus at the Royal 

 Botanic Gardens, Kew. The specimens were received 

 in March, 1898, with a note from the curator, Mr. G. 

 Nicholson, stating they were imported from Japan 

 upon the above-named plant, which had been out of 

 doors since January of the same year. The plant sub- 

 mitted to me was completely covered with scale, 



