8 [January, 



the forked nervures ; bat in the analysis of Fericoma {pp. clt. 

 p. 256, step a a) it is employed to denote the anterior of the two 

 simple nervures. The reason why, contrary to Haliday's view, the 

 cubitus is in the present Synopsis described as absent in genera 

 of Grroup I, is because the anterior of the two simple nervures is 

 much weaker than the posterior in the wing of Fsychoda, and this 

 weakness is here regarded as evidence of its liability to be sup- 

 pressed. Again, the nervure above referred to in the explanation 

 of the woodcut as nameless, is by Schiner, in his analysis of the genera 

 (Dipt. Austr., ii, p. xxxi, step 5, Sycorax), reckoned to be a rudimentary 

 axillar nervure. This may be partly owing to the figures illustrating 

 Sycorax in Walker's Ins. Brit. Dipt., iii, pis. xxvi, 5a, and xxx, 1, failing 

 to show the nervure termed axillar in the present Synopsis. The artist, 

 in fact, no doubt working at a disadvantage, failed to represent the 

 nervures that meet the posterior basal ceil, with his usual exactitude. 



Little use is made of the term metatarsus. 



Bibliography is curtailed. Only useful figures and descriptions 

 are cited in full detail : where such are wanting, nothing more than 

 authorship and date of publication is noted after the name of a species. 

 Brevity is further attained, and much needless repetition avoided 

 under the head of Groups, Genera, &c., in the general text, by the 

 method here employed of quoting in reverse order the numbered steps 

 that lead to them in the Analytical Key. 



(To be continuedj. 



DEAaON-FLIES IN 1892. 

 BY C. A. BBIGGS, F.E.S. 



A record of the species captured by my brother and myself 

 during the past season will not, perhaps, be without interest, for either 

 the year must have been an unusually good one, or the locality that 

 we have chiefly worked must be a singularly prolific one. 



The spot in question is the Hut Pond, near Wisley, Surrey, and 

 is situate on the main Portsmouth E,oad, between Cobham and E-ipley. 



Prom round this pond we have, during the present year, taken 

 eighteen species, and there are some three or four species more, which 

 we might fairly hope to take in another season. As the whole number 

 of the British Odonata (not counting Sympetrmn vulgatum) is but 46, 

 seven of which are either casual visitors or of doubtful authenticity, 

 this seems to be a large number of species to occur at one pond. 



We began (as recorded in Ent. Mo. Mag., new series, vol. iii, p. 

 199) by taking Symp. Fonscolombii, of which extremely rare species 



