84 THE ENTOMOLOGIST. 



E. AntennEe long ; legs black ; in female yellow with black tarsi tijos. 



longicornis. 

 EE. Antennae moderate ; legs tawny yellow ; in female with black ring on 



posterior femora terminata. 



DD. Abdomen with yellow side spots, 



F. A broad yellow band round the sides of the thorax, interrupted at 



base ot wing. Apical abdominal spot usually united to the others. 



G. Antennae tawny. - pardalma. 



GG. Antennae black formosa. 



FF. A very thin band round the sides of the thorax. Apical abdominal 



spot seldom united to the others. - . - - j^i/f/maja. 



CC, Abdominal spots large and wide, extending nearly across the disc, and 

 with one large apical spot. 



H. Thorax striped in female. pulchella. 



HH. Thorax not striped in female. tnorrisii. 



1. 0. trilineata, F. (1781), Sp. ins. ii. 418. = hypoleon, L. — 

 A not uncommon variety, known as collaris, is yellow instead 

 of green. Not rare. Occurring near London. 



2. 0. analis, Mg. (1822), Sys. Bes. iii. 130, — An uncommon 

 species, easily recognised by the suffused stigma. Dorsetshire is 

 the onl}^ locality I know of. This county seems to produce 

 nearly all the known British species of this genus, they are 

 certainly all much more abundant in the extreme south-western 

 counties of England than elsewhere. 



3. 0. longicornis, Dale (1842), Ann. Nat. His. viii. (431). 

 = ? terminata, Wlk. : ? tenuicornis, Mcq, — A rare species, recog- 

 nised by the much lengthened antennffi. One var. with a very 

 narrow abdominal border from the middle to the apex seems to be 

 the terminata of Walker, whose description applies only to the 

 female, as he says " legs tawny," whereas in the male they are all 

 entirely black. It appears to be closely allied, if not identical 

 with, Macquart's tenuicornis; in the latter event tenuicornis 

 has priority. Without seeing Macquart's type it is impossible to 

 speak with certainty. The female may be separated from the 

 female terminata by having a pair of whitish yellow spots on the 

 vertex of the head which are absent in terminata. 



4. 0. terminata, Mg. (1822), Sys. Bes. iii. 180. — Very rare. 

 It was a long time before I was satisfied that this was really 

 a British species, but I have recently seen some specimens from 

 Mr. Dale's collection taken in Dorsetshire, which are undoubtedly 

 of this species. Walker says there are four yellow spots behind 

 the eyes, but this is not the case, his description evidently being 

 of a variety of longicornis. Curtis gives Pinny (June and July) 

 as a locality, taken by Mr. Morris, in company with 0. pardalina, 

 but without seeing the actual specimens it would be rash to 

 conclude tlie}^ were correctl}^ named, owing to the great increase 

 in the number of known sjaecies of this genus and their close 

 affinities. 



6. 0. pardalina, Mg. (1822), Sys. Bes, iii, 128. — Walker says 

 " not rare," but I have not seen any British specimen of it yet. 



