20G [September 



sectional import. At the same time it is quite possible that the nature 

 of the site dwarfed the specimens — a very diminutive streamlet de- 

 scending the low slope above the commencement of the beach, exposed 

 to the sea spray in storms. 



Pericoma onagnicornis. Van der Wulp, Dipt. Neerland., i, 319 

 (1877), a Dutch species, is scheduled by that author with P. ocellaris 

 as having («), the central cross vein at near about one-fourth of the 

 w'ing's length ; basal cell also very long : {d), wings very acute ; axil 

 of the upper fork before that of the low^er fork ; fringe varied with 

 dark and light spots. But for the length of the antennse (which in 

 the ^ are described as being one-third longer than the whole body), 

 and the variegation of the wing-fringe, its identity with P. nofabilis 

 might have been considered probable. 



Subsection C of the 3ed Section of Peeicoma. 



Eefer supra, p. 128. 



In the Synopsis, a/z^e, 2nd ser., vol. iv, 124, the species of this Sub- 

 section and of the next were thrown together in the line of steps la, 

 3, and c. Their separation here causes their succession to be modified. 

 Pericoma morula (25), and laheculosa (23), according to the arrange- 

 ment of the bristling hair on the wings, are the nearest in relationship 

 to species of Subsection B ; their similarity in facies to species of 

 Subsection A of the 4th Section is only a matter of analogy. P. 

 consors (22), scheduled with them under step C, c, supra, p. 128, 

 approaches Subsection B in the character of the antennse, but is more 

 nearly related by wing-characters to P. decipiens (20), scheduled 

 D, d. Notwithstanding their close resemblance to the species last 

 mentioned, P. soleata (21) and amhigua (19), are nearer of kin to 

 P. advena (24), scheduled D, d.d. ; and the resemblance between 

 soleata and revisenda (30), of the 4th Section,' is purely superficial. 



The wdng-markings vary somewhat in definition and colouring 

 with the pose of the specimen with regard to the light, and with the 

 nature of the background to w^hich it is opposed. 



25. Peeicoma moeula, Etn. 



P. morula, ante, 2nd ser., vol. iv, 127, and vol. v, pi. iii, P. 25 

 (neuration). 



Extremely similar to P.fratercula (26) of the next Section, but distinguishable 

 at a glance, through the small black hair-spot at the end of the axillar nervure 

 standing in line with those of the forks, or by the pobrachial fork being in line with 

 the radial fork and the end of the axillar, and not exterior to the shortest line 

 between them. These spots lie far within the limits of the bristling hair, except the 



