1912.] 63 



segment, the metathorax seems to project far on either side — a breadth sufficient 

 for the implanting of three hairs. Dorsal mark interrupted, segs. 1 — 7 (?) or 

 1 — 5 ( J ), by a clear furrow. Stigmatic spaces clear, but more sharply defined 

 than in the type. Eighth seg. ? entirely coloui-ed ; ninth, with two spots and 

 two small terminal spines. In the <? (seg. 6), the two spots into which the 

 dorsal band is divided are broader at the sides than towards the middle. On 7, 

 the markings are reduced to a continuous band, much narrower in the middle ; 

 on 8, the band is indistinct save at sides. The ninth shows two spots, confluent 

 medianly. In both sexes, the eighth and ninth segs. are well developed. There 

 is an incomplete transverse posterior rov/^ of long hairs on each of abdominal 

 segs. 1 — 7, one hair near edge behind stigma, and one or two on each side of 

 the median fiirrow. These arise from clear spots. 



The above description from the Shetland specimens shows differ- 

 ences which may be summarised thus : — signature not to mandibles ; 

 a more prolonged uncoloured 'furrow,' which reaches the prothorax ; 

 clear space at stigma reduced, and spots on seg. 7 (^) narrowed 

 medianly. These would hardly justify any separation but for the greater 

 size. We may compare the two thus (10 = 1 mm.) : — 



Docophorus nirmoides (? , 13 ? j 16. 



„ „ major <?,15 ? , 19. 



As the following details show, the difference is most marked in 

 head and abdomen. 



c? ¥ 



Length. Breadth. Length. Breadth. 



Head 051 ... 040 053 ... 042 



Prothorax 010 ... 024 Oil ... 025 



Metathorax 017 ... 035 017 ... 037 



Abdomen 076 ... 052 (on seg. 4) 109 ... 060 (on seg. 4) 



For comparative figures, see Piaget, p. 105. 



The legs and genitalia seem to offer no distinguishing feature. 

 The single ^ of major has a short apparatus, with lateral appendix 

 curved. 



References. 



1. In Giebel Ins. Epiz., p. 168 (1874). 



2. Les Pediculines, pp. 104—105, pi. 9. f. 2. (1880) 



3. Les Pediculines, pp. 178—179, pi. 15. f. 2. (1880). 



4. Mon. Anopl. Brit., p. 150. (1842). 



5. Journ. New York Ent. Soc, Vol. 10, p. 218, pi. 20, f. 4. (1902). 



The Manse, 



OUaberry, Shetland : 



December, 1911. 



