10. BERIS 207 



to have been a true Berid female, but with entirely black legs, and no known species 

 will answer to that ; the male of Actitia nitens has entirely black legs, but is not 

 kno-\vn to occur in England, while after A. nitens the most black-legged species is 

 B.genkulata which usually, though not always, has conspicuously yellow knees; 

 Forster's description being unrecognisable must sink as a doubtful synonym of 

 A. nitens or B. geniculata, but with no certainty that it refers to either of those 

 species, as the genus Musca of those days was a very comprehensive one. 

 I should give the synonymy and references of the two species as follows : 



B. FUSCIPES Meig., S.B., ii., 8, 11 (1820) ; M<icq., Soc. Sci. Lille, 1826, 139, 7 (1826), 

 et Suit, a Buff., i., 237, 8 (1834); Lie, Stettin, ent. Zeitg., vii., 282, 4 (1846); Zett., 

 Dipt. Scand., viii., 2949, 2-3 (1849); Walk., Ins. Brit., i., 12, 4 (1851), et List. Dipt. 

 Brit. Mus., v., 9, 4 (1855); Srhin., Verb, zool.-bot. Ver. Wien, v., 655, 4 et 674 (1855), 

 etF.A., i., 24 (1862); Brun., Entom., xxii., 134, 4 (1889); Schoch., Dipt, helv,, 26 

 (1890); E. L. Goxicke, Annal. soc. ent. Belg., xxxvii., 435 (1893); Kertesz, 

 Termeszettud, Kozl. Potfiiz., Iv., 131 (1900); Verr., Brit. Fl. Strat., 207 (1908). 



hrevicornis v. Heyd. in litt. ad Lw. 



B. GENICULATA Curt., Brit. Ent., 337 (1830) ; Walk., Ins. Brit., i., 12, 6 (1851), et 

 List Dipt. Brit. Mus., v., 10, 7 (1854); Wahlbg., Of. Vet. Akad. Forhandl., xi., 212 

 (1854); Zett., Dipt. Scand., xii., 4552, 2-3 (1855); ,Schin., Verb, zool.-bot. Ver. Wien. 

 v., 656, 6 et 674 (1855) ;_ Verr., Brit. Fl. Strat., 203 (1908). 



fuscipes Beck., Berlin, ent. Zeitschr., xxxi., 100, 9 (1887). 



4. B. fuscipes Meigen. Very similar to B. geniculata, but with the 

 antennae shorter and the legs paler. Thorax partly pale haired. 



A still insufficiently known species, but if distinct more 

 closely allied to B. geniculata than to any other. 



$. V^?iihQV Y}Lk.Q hoih. B. genictdata ?a-\(\. B. chalyheata but structurally nearest to 

 B. geniculata, Face_ very small being scarcely one-third the height of the 

 head nor a quarter its width at its widest part, scarcely at all produced. 

 Eyes with shorter pubescence than in B. genicnlata. Antenna? short and 

 inserted on the lower third of the head, the third joint being only about one 

 and a quarter times the length of the two basal joints together ; third joint 

 rather Avide on its large basal annulation but thence rapidly tapering and 

 the remaining annulationsnot one and a half times so long as the basal one ; 

 antennae greyish on the inside but not very conspicuously so. 



Thorax narrower than in B. geniculata and with more short yellowish but 

 inconspicuous pubescence intermixed all over (including the scutellum) under 

 the longer black pubescence, though the black pubescence is less abundant 

 than in B. geniculata. 



Abdomen much more shining than in B. geniculata and with the long 

 pubescence about the sides more brownish white but yet more like that of 

 B. geniculata than that of B. chalyheata, and on the fifth and sixth segments 

 the pubescence becomes blackish. Genitalia large, with the orange lamella? 

 shorter than in B. geniculata. 



Legs black with the knees broadly but sharply orange, the basal two- 

 fifths of the anterior and the basal quarter of the hind tibiae being 

 orange, and all the ankle joints narrowly so j the hind femora are luteous 

 at the base and posteriorly to nearly one-third of the femora, while the 

 anterior femora show traces of being luteous at the base ; basal joint of the 

 hind tarsi shaped as in B. geniculata but rather shorter, though still longer 

 than the other four joints. 



Wings very much less darkened, so that the stigma stands out long, black, 

 and conspicuous. Squamae yellow, with yellow fringes. Halteres orange. 



?. Frons (fig. 149) narrow, being barely more than one-fifth the width of the 

 head, and with its sides quite parallel until the cross-furrow a little above the 

 antennae; face at the mouth only one-third the width of the head; upper 

 part of the back of the head (I think) a little more inflated behind the eyes. 



