1891.] 2G5 



to be a well marked example of the present species. Walker describes the palpi as 

 being black, but I find them pale in colour, in his own specimen. 



17.— NEMOEILLA, End. 



Nemoe^a, pt. Mgn., ]\rcq., Schn. 



Qen. ch. — This genus, like tlie former {ChetoJyga), differs from 

 NemorcBa by having the eyes prolonged, and the chin short, so that the 

 antennae are inserted above, instead of opposite to, the centre of the 

 eyes. The points of distinction between Chetolyga and NemoriUa 

 are, that in the latter the cheeks are bare, instead of being hairy, 

 and the central abdominal segments are armed with setae both on the 

 disc and on the edges, instead of only on the latter parts, as in 

 Chetolyga. The two genera agree in all other essential points. 



N. PLOEALTS, Fin., Zett., non Mgn. 

 noiahilis, Mgn., Schn. 

 T. intersita ?, Wlk., ? . 

 This, the only recorded British species, has the eyes approximated in the male, 

 and rather widely separated in the females ; the antennae have the third joint rather 

 narrow, and about one-third longer than the second ; the arista is long, and thickened 

 for nearly half its length ; the palpi are black in the male, but sometimes pale in 

 the female ; in which sex the basal joints of the antennse are also sometimes rufous ; 

 the thorax is black, with grey pubescence, and marked with three wide black stripes, 

 the middle one, which is the broadest, being often divided into three ; the scutellum 

 is black or grey ; the calyptra are dirty white ; the abdomen is black, covered with 

 grey pubescence, and marked by a dorsal black line, and with transverse dentated 

 bands on the second and third segments, that on the former being wider than the 

 other, and having the marks running together to form a somewhat square-shaped 

 spot ; the anal segments are black, the sides of the second segment are generally 

 slightly rufous in the male ; the wings have the outer cross vein sinuous ; the legs 

 are black, and have the hind tibiae ciliated externally with slightly uneven bristles. 

 This fly is not uncommon ; I received one many years ago from the late Mr. Cooke, 

 of Bowdon, which he had bred from Botys verticalis, and Mr. Billups has one reared 

 from Plusia festuccB. Mr. Verrall kindly sent for my inspection the typical speci- 

 men of Walker's T. intersita, which he had obtained from the late M. Desvigne's 

 collection. I find that it is a female of the present species, though Walker's own 

 description docs not exactly agree with it, for he says that it should have four dorsal 

 thoracic stripes, whereas the specimen has but three, or rather five, the central one 

 being divided. 



18.— OLIVIEEIA, Desv. non Mgn. 

 Panzeria, Mgn. 



Gen. cli. — Eyes thinly haired, sometimes nearly bare, approximate 

 in the male, and rather remote in the female ; cheeks and facialia 

 bare ; antennae free, with the second joint elongated, and nearly as 

 long as the third ; arista with the second joint a little prolonged, and 



