OBSERVATIONS ON SCALE-INSECTS (COCCIDAE) — III. 355 



apparently complete, but usually faintly indicated ; tarsi with a marked indentation 

 2nd and 3rd pair of legs ; (fig. 8, c) with the tibio-tarsal articulation imperfect, and 

 usually indicated by a thinning of the chitin on the lower half only. Anal lobes 

 relatively large (fig. 8, d), with the basal edge much longer than the outer ; the tips, 

 externally, show three spine attachments ; ventral sclerite with one proximal and 

 two distal, long, spinose hairs. Anal ring of six hairs. Anal cleft fused, excepting 

 a small portion towards the margin ; length a little less than one-fourth the length 

 of the body. Derm cells wuth minute clear pores, very thinly scattered over the 

 whole of the dorsum. There are two long post-anal hairs, and immediately in ad- 

 vance of them, a very scattered group of pores (fig. 8, e) ; but these entirely dis- 

 appear in very old examples. Marginal spines simple, slender, and curved. Stigmatic 

 spines three, central one much the longest. Stigmatic clefts faintly indicated. 



Length, l'7-2 mm. 



Female, second stage. Ovate. Antennae resembling those of the adult ; but 

 the 4:th and 6th segments are sometimes fused, so that in such instances only five 

 segments exist ; one example possesses both forms of antennae. Tibio-tarsal 

 articulation in legs ii. and iii. usually a little more pronounced than in the adult. 

 Anal ring with eight hairs, two smaller than the rest. Post-anal pores (fig. 8, e) 

 extending midway between the anal lobes and the rostrum ; there are from 18-20 

 of these, varying in shape and size and some of them coalescing. A few short spinose 

 hairs scattered thinly over the whole of the dorsum. Stigmatic spines three, the 

 median one of great length. Stigmatic clefts faintly indicated. Anal cleft appar- 

 ently fused. 



Male puparium. Glassy in texture, relatively broad, divided into nine plates : 

 one cephalic, three bilateral, two dorsal. 



Length 1-2-1 -3 mm. ; width, 0-75 mm. ; thus, compared with the size of the adult 

 females, the puparia are, relatively speaking, exceptionally large. 



British Guiana: Sea shore. East Coast, on " Coupida " {Avicennia nitida), 

 30.V.15 {G. E. Bodkin). 



This is apparently a viviparous species, as embryo larvae were found in two of 

 the examples. Distinguished by its unusually small size, and the fusing of the 

 tibio-tarsal segments in legs ii. and iii. ; the number of segments to the antennae 

 (six) is also somewhat unusual. It is clearly distinct from Cockerell's Lecanium 

 {Coccus) nanmn, and L. rubellum. My colleague, Mr. E. E. Green, to whom ex- 

 amples were sent in the first instance, has asked me to describe this species. I 

 have pleasure in doing so and have adopted the MS. name which he gave it, 



Lecanium acaciae, sp. nov. 



Female, adult. Elongate, highly convex on small twigs ; low convex on the larger 

 branches and sometimes irregularly keeled along the median line ; often shrivelling 

 considerably after death. Colour bright ochraceous, reddish buff, or dull castaneous, 

 rarely with a faint pigmented reticulation ; eyes black. Antennae (fig. 9, a) usually 

 of eight segments ; immediately below the articulation of the 4th and 5th segments 

 is an extremely long outstanding bristle ; a rather long slender spine arisin<T from 



