202 Syrphidae. 



after it there is a little clump of short hairs on the anterior side; the 

 middle tibiæ are a little dilated ventrally after the base, the dilatation 

 bears very short, dense, black bristles, and on the anterior side a tuft 

 of longish, yellow hairs; after the dilatation the tibia is a little excised 

 belovv and the end a little thickened ; on the posterior side there is in 

 the middle a little tuft of longish hairs; the middle metatarsus is thin ; 

 the hind tibiæ have a row of short, black bristles on the antero-dorsal 

 side, very short on the upper part ; hind metatarsus a little thickened. 

 Wings slightly or a little more brov^^nish tinged. Squamulæ whitish 

 to brownish white, with a darker margin and a yellow fringe. Halteres 

 yellow, sometimes the knob a little darkened. 



Female. Frons and epistoma not broad; frons metallic shining 

 with two large, yellow dust spots, black-haired; the hairs on epistoma 

 yellow. Antennæ generally paler beneath the third joint than in the 

 male. Thorax brightly shining, sometimes somewhat purplish, short- 

 haired. Abdomen with four distinct pairs of yellow spots, sometimes 

 somewhat hoary; the basal spots larger than in the male and quite 

 near to the front margin, the second and third pairs more transverse, 

 slooping off outwards from the front margin of the segments and with 

 the hind margin somewhat concave; the fourth pair quite distinct. 

 Legs paler than in the male, the anterior quite pale or with traces of 

 rings on tibiæ, the hind legs with base of femora and knees distinctly 

 pale; the middle femora show a slight excavation on the same place 

 as in the male. 



Length 8 — 10 mm. 



The pupa has a length of 6 mm ; it is yellowish or light brownish 

 yellow, slightly transversely corrugated, with a short, brown, long- 

 itudinally divided posterior spiracular process. 



This species is in the male known at once by the shape and 

 hairiness of the anterior legs; the female is distinguished from the 

 preceding among others by the less produced epistoma, the distinct 

 four pairs of abdominal spots and the pale anterior legs; finally in 

 both sexes the third antennal joint is pale beneath. — I possess of 

 this species a curious, hermaphroditic specimen; it has exterior male 

 genitalia, only somewhat small; the eyes are separated and the frons 

 only a little narrower than in the female; the front femora have a 

 few black, bristly hairs between the pale, the tarsi have the first joint 

 shaped as in the male but much narrower; the other characters, as 

 the hairiness of the body and the abdominal spots are rather inter- 

 mediate between male and female. Verrall mentions a female with 

 stronger and partially black hairs on front femora and small, dark 

 abdominal spots, perhaps also a hermaphrodite. 



