FROM THE society's GARDENS. 275 



bands as rafters of the skull run forward towards the mandibles^ 

 and are straight and parallel to one another. In front of each 

 antenna is a fairly large inci'assation , rounded in form and con- 

 nected by a narrower neck with the margin. Thorax: Narrower 

 . than the head, with straight metanotal margin and convex lateral 

 margin. Abdomen: Broader than the head, elliptical. A brown 

 band on the dorsum of the segments, those on 5, 6 and 7 being 

 the deepest in colour and in length. Gonopods (see text-fig. 11). 

 Chcetotaxy. Female. — Head : Dorsal surface covered with a 

 great many fairly short hairs. Antennfe also set with- a great 

 many hairs, long and short, including one long one preaxially 

 and a row of four long ones dorso-postaxially in segment 2, and 

 on segment 3, along the postaxial margin, a straight row of six 

 fairly long hairs. Ventrally, postantenual area appears to be 

 quite bare. On the preantennal area there are numerous long 

 bi-istles between the antenna and the frontal margin. Thorax : 

 Dorsal surface set with small bristles, arranged as shown in the 

 figure. Abdomen : Dorsal surface covered with bristles, long 

 and short, which it is possible roughly to analyse into three 

 traiisverse rows on each segment. There is, however, a small 

 bare area inside each pleurite. Each pleurite carries numerous 

 small hairs and two long ones, which are particularly long in 

 segments 6 and 7. Dorsum of last segment almost bare, except 

 for four or five long hairs in a widely-spaced transverse row. 

 ' Yentral surface thickly covered with hairs, there being a par- ' 

 ticularly dense patch between the gonopods. At the extreme 

 end of the abdomen there are two long bristles dorsally and two 

 ventrally. 



Mouth-parts. — Although thehair-canal in front of the mandibles 

 may be said to be absent, it is indicated on the ventral surface 

 by a difference in the thickness of the chitin of the margin. 

 Mandibles are large and strongly ridged, the right one in almost 

 its whole breadth lying behind the left, far forward near the 

 front margin of the head. On the right one are three distinct 

 apices, the middle one being the longest. At the base it runs in 

 as a stout quadrangular process (text-fig. 12). Opposite this and 

 on the dorsal surface is a large knob of dense chitin. The left 

 mandible has three apices, two of which are very small and close 

 together, and the usual narrow basal process. The transverse 

 ridges are particularly strong, j)rominent, and downwardly 

 directed at the base of the ventral tooth. Ridges are continuous 

 in both mandibles across the surface of the mandible. First 

 Maxilloi : These do not call for particular remark. Lahitmi : 

 Front margin straight with a small, short, squat pai'agiossa 

 at each lateral angle. Isopogometric Apparatus : The pharyngeal 

 sclerite or lyriform organ is a slender and delicate piece of 

 chitin, consisting of two large sprawling posterior cornua, a 

 prominent median cornu between these, a small and insignificant 

 "nucleus" or main body, and two anterior cornua rather broad 

 and long. The chitinous chord or duct, as usual, runs forward 



18* 



