3. OXYCERA 111 



it differs from 0. dives by having a large oblong yellow spot on each side 

 of the thorax (where the small isolated spot occurs in 0. dives) which 

 extends more or less towards the humeral spot and usually connects with 

 it, and by the last pair of abdominal spots in both sexes being more 

 narrowly transverse, so that they are far more separated from the previous 

 pair than is the case with 0. dives ; in my male specimen of 0. locuples the 

 last pair of spots are quite as widely separated from each other as in my 

 specimen of 0. dives, but in the female of 0. locuples they are much closer 

 to each other as they leave only the middle sixth of the dorsum black ; the 

 female of 0. locuples has, I believe, always and the male sometimes (Becker 

 says eleven out of forty) a third (basal) pair of abdominal spots, while the 

 female has the frontal side spots larger and extending upwards almost to 

 the upper ocelli, and the spots on the back of the head narrowed downwards 

 but extending to the jowls ; the legs of 0. locuples are rather more yellow. 

 Becker states that 0. locuples varies considerably in its yellow markings, 

 but he does not hesitate in considering it quite distinct from 0. dives. 



0. dives is very rare in Britain and I only know of four or five 

 specimens. Walker first recorded it in 1851 as "Eare. In the collec- 

 " tion of the Entomological Club. (E.)," and Brunetti (Entom., xxii., 86) 

 stated that there was a large Oxycera in the Entomological Club collection 

 alUed to 0. pidchella, but that it was not 0. dives ; I have however closely 

 examined the specimen, and have made my description of the female from 

 it, and have no doubt as to its determination ; it has no history attached 

 to it, but from its pin and general appearance I should think it was 

 British. The next record is that of C. W. Dale (Entom. Month. Mag., 

 April, 1898) who took a male at Eannoch on June 9, 1896 ; his record 

 says June 18, but the specimen in his collection bears the date of June 

 9. Lastly Mr A. E. J. Carter (Entom. Month. Mag., January, 1904) took 

 three males on the hills at Aberfoyle, near the waterfall known as Rob 

 Eoy's Leap, one on July 6th, one on July 8, and one on July 9, 1903, at 

 rest on bracken (Fteris) in sheltered spots. Both the localities are in 

 Perthshire, and I know no reason for Walker attaching (E.) to the 

 Entomological Club specimen. It is recorded from only Central Europe. 



11. O. trilineata Fabricius. Cubital vein forked. Thorax and abdomen 

 green (or yellow) with black markings. Face practically all green (or 

 yellow). 



A very distinct species, because of the predominant green 

 (or yellow) markings. 



(^ . Face and frons forming a small green (or yellow) triangle, but the sides of 

 the face glossed with white ; face and frons practically bare, but a very short 

 pubescence exists on the face and is continued under the eyes to the small 

 jowls and on to the back of the head, where it becomes longer and rather con- 

 spicuously whitish ; the absolute back of the head is black, with the lower third 

 very little inflated (for an Oxi/cera) and with a silvery postocular margin, and 

 there is a faint pubescence extending upwards from this for a short distance ; 

 the ocellar space and the long pointed frons shining black, but behind the 

 ocelli and extending somewhat on to the occii^ut is a conspicuous bright 

 yellow spot which bears very short yellow pubescence. Eyes bare, touching for 

 nearly half the distance between the occiput and the antennse ; in life greenish 

 with a brownish red band on the dividing line of the facets; facets on more 

 than the upper half large and in dried specimens reddish purple, but on the 



