^00 NEW PERMIAN INSECTS TKOM BELMONT^ N.S.W.^ 



pterostigmatic area, and a smaller piece from the border of the elavus. But it 

 shows most of the three anal veins, which are absent from No. 55. 



This species may be distinguished at once from P. aiistralica Till, and P. 

 mitchelli Till., already described from Belmont (op. cit., pp. 733-6) by the 

 very marked sinuous curvature of Cm distally, by the condition of Se, which 

 only gives off the humeral veinlet (lim) basally and then divides into Sci and 

 Sc2 distally, without any additional veinlets being present, and by the peculiar- 

 condition of the basal piece of M4, which is specialised to resemble a cross-vein. 

 The positions of the forkings of the main veins are closely similar to those of P. 

 australica, while the formation of the cubito-median Y-vein, completely revealed 

 for the first time in this species, shows that the interpretation placed by me on 

 the same partially preserved area in P. mitchelli was substantially correct. Of 

 the two arms of the Y-vein, the upper, M5, is much shorter and also not so 

 strongly formed as the lower, Cui; this may be profitably contrasted with the 

 condition shown in Parabelmontia (Text -fig. 3). The system of cross-veins is very 

 weakly developed, and much less numerous than in the previously described 

 species. 



Types, Holotype, Specimen iSTo. 55, of which both the obverse and re- 

 verse impressions have been preserved; the obverse being in Mr. Mitchell's Col- 

 lection, the reverse in the Collection of the Cawthron Institute, Nelson, 

 N.Z. (presented to me by Mr. Mitchell). Paratype, Specimen No. 51, in Mr. 

 Mitchell's Collection (obverse only). 



In Text-fig. 4, the dotted anal veins axe restored from Specimen No. 51, 

 while the rest of the wing is drawn from Specimen No. 55. 



Permochorista aefinis^ n.sp. (Plate xxxiv., fig. 6; Text-fig. 5.) 



Total length 6.6 mm.; greatest breadth 2.5 mm. An almost perfect obverse 

 of a right forewing on medium grey eherty shale, but with the end of the elavus 

 slightly buckled and the veins above it broken. 



Closely allied to P. sinuata, n.sp., from which it differs in the following 

 points: — Size considerably smaller, wing somewhat broader towards apex. So 

 with its two distal branches closer together, Sci arising half-way along the wing- 

 length instead of well before it as in P. sinuata; sc-r placed closer to Sci and 

 running in a different direction from what it does in P. sinuata; pterostigma 

 much shorter and differently shaped; fork of R2-(-3 much shorter; cubito-anal 

 Y-vein differently formed, with both upper and lower arms much shorter; cross- 

 veins differently arranged, as may be seen by comparing Text-fig-s. 4 and 5. 



T y p e. Specimen No. P. 3. in Mi-. Mitchell's Collection. This specimen 

 was discovered by Mr. T. H. Pincombe. 



It is possible that the differences between the two species here described, on 

 the one hand, and those previously described by me, on the other, (viz. the 

 formation of Sc and its veinlets, and the curvature of the distal end of Cui), 

 might justify the removal of the two new species to a new genus. As more 

 material is sure to come to hand later on in this family, this question is best 

 left over until the fullest information is available on the subject. 



It might be suggested that P. affinis is only the hindwing of P. sinuata. I 

 have decided against this; firstly, because the impression of P. affinis is a very 

 clear one, strongly suggestive of a forewing; and secondly, because it has all 

 three anal veins separate. All known Mecoptera have lA partially fused with 

 Cu2 in the hindwing; and it will be seen from my previous figure of P. mitchelli. 

 (op. cit., p. 735) that this fusion was almost certainly present in hindwings of 

 the family Permochoristidae. 



