432 Mr. J. C. Dale on some British Diptera. 



utrinque macula flava. Thorax vitta laterali flava pone alas dilatata. Scu- 

 tellum flavum. Abdomen limbo tenui flavo. Halteres albidi. Alae hyalinse 

 nervis introrsum flavicantibus. Pedes cum coxis ferruginei : tibiae anticae 

 apice, posteriores medio, tarsi antici toti, posteriores apice fusci." 



" Seems very much similar to Macquart's 0. tenuicornis, but the 

 peculiar marking of the head may afford a distinction, as Macquart 

 leaves us to infer that his agrees in that with 0. muscaria, very dif- 

 ferent from yours." — Hal.MSS. (in litteris) . This (at present) unique 

 insect I believe I took at the same place and time on Cosmore com- 

 mon with the Limnobia 6-guttata, but had previously taken it for a 

 var. of 0. muscaria (pygmcea, Fall. ?). Mr. Haliday considers it very 

 distinct. 



While I am on the genus Oxycera, I may as well mention that he 

 thinks he saw 0. hypoleon ? in the cabinet of the late Mr. Tardy of 

 Dublin ; but as it is some years since, and he has no opportunity of 

 again inspecting it, he will not be positive. If we can ascertain this 

 to be British, our list will contain — 



1. 0. hypoleon ? near Dublin (Mr. Tardy}). 



2. 0. pulchella, tolerably common in England, Scotland (and Ire- 

 land?). 



3. O. trilineata, common everywhere. 



4. O.formosa, pretty common everywhere. 



^ J muscaria, Cosmore common, Portland. 

 \pygm<za (var. affinis), Charmouth, &c. 



6. 0. Morrisii, Curtis, Br. Ent. plate 441. This seems to be 

 widely distributed : I have taken it here, near Charmouth, near Cam- 

 bridge, and Castle Edendene ; and Mr. Haliday took it in Ireland. 



7. 0. pardalina ? I never took, except near Lyme, but I think Mr. 

 Haliday has observed it in Ireland. My specimens do not quite agree 

 with Meigen's figure ; the spots on the abdomen are not so united as 

 in his figure. 



8. 0. analis, confined to Glanville's Wootton, as far as I know or 

 can learn. 



9. 0. leonina, the rarest of all; I have a pair, both from Char- 

 mouth ; the (j / took. 



10. 0. terminalis, found here and at Charmouth, and at Pinny, 

 near Lyme Regis. 



11. 0. iongicornis, Mr. Haliday as above. 



Curtis's Guide, genus 1290, Cenosia, Meig. 

 (This is not given as a new species.) 

 C. mollicula ? of Fallen and Zetterstald ? ? " Cassia antennis palpis 

 pedibusque flavis ; abdomine antice pallido diaphano." (Long, 2£ 

 lin.) Mas. 

 C. testacea, Desv., et speciebus cognatis (sc. pallidicorne, Desv., ne- 

 morali, &c.) gracilior, fronte angustiore, pedibus multo longioribus 

 et rarius setigeris. Desvoidio Palusia audiret. 



" Frons vitta atra postice bifurca. Facies pallescens. Antennae facie bre- 

 viores, flavse, articulo 3° pallidiore oblongo obtuso, aristae subtiliter villosulae. 

 Thorax caesius, absque vittis. Abdomen compressum, segmentis 2 anticis 

 paliido-diaphanis linea dorsali ferruginosa. Pedes elongati flavi. Tarsi ob- 



