60 SYRPHID^!. 



two yellow stripes, thus forming a perfectly quadrate black median 

 spot ; the other segments black, the third bearing sometimes a 

 pattern like that of the second, or with a more or less broad yellow 

 spot ; venter black, yellow towards the middle at the base ; male 

 genitalia black. The four front legs are yellow, but the coxae and 

 femora, except the ends, are black, the front femora besides are 

 yellow on the anterior surface ; middle tarsi very characteristic, 

 the basal joint being in the male disciform, nearly circular, and ii 

 the female not dilated, but much shorter than in the females c ' 

 the two preceding species ; hind legs strong and thick, black, the 

 femora yellow at each end, the tibise unarmed externally, the tarsi 

 yellow ; the hairs are dense and short ; first joint of front tarsi with a 

 black basal stripe (as in Jibing i a), which is often indistinct. Wings 

 with a faint brownish -yellow tinge; stigma darkened at the base; 

 th-jre is a single broad middle band, beginning at the fore border 

 before the end of the first vein and ending towards the apex of the 

 discal cell ; there is besides sometimes a trace of an indistinct 

 short second band along the subapical cross-vein. 



Type $ , another specimen, and type from Oshagbo, S. Nigeria. 

 x. 1910 (Dr. T. F. G. Mayer) ; a female from Ilesha, S. Nigeria, 

 23. vii. 1910 (Cnpf. L. E. Humfrn/); two females from Obuasi, 

 Ashanti, 7-30. vii. 1907 (Dr. W. M. Graham}. 



53. Graptomyza nigra, sp. n. 



d 1 $ . Length of body 8 mm. 



Near the preceding species, but darker, with broader facial 

 stripes, the base of the scutellum black, and the abdomen not 

 golden. 



Head as in G. aurect ; the four frontal yellow spots are very 

 small and separated ; the median facial stripe is shining black and 

 very broad, the face therefore appearing to be bljick with two 

 yellow stripes ; third antennal joint entirely black, with a yellow 

 and shortly plumose arista ; eyes clothed with long whitish hairs. 

 Thorax as in the preceding species, but with shorter pubescence, 

 which is grey and not golden ; the yellow markings are less 

 developed, there is no spot inside the humeral callus, the sutural 

 streak is smaller, and the mesopleural stripe is very narrow; 

 scutellum as in G. aurea, but shining black on the basal half. 

 Squamulse whitish and with a white fringe. Abdomen as in the 

 preceding species, but the pubescence is grey, mixed with black 

 hairs towards the end of the fourth segment ; it is black, with only 

 two parallel narrow yellow stripes running from the fore border of 

 the second segment to the middle of the third ; there is besides a 

 yellow marginal stripe, which is broader on the sides of the second 

 segment ; venter black ; male genitalia black. Legs as in G. aurea, 

 but the hind femora only with the extreme base narrowly yellow ; 

 the knees are also more narrowly yellow ; first joint of middle tarsi 

 of male distinctly, but less, dilated ; the black hairs are more 

 abundant. Wings with the stigma tic field vi'llow, black towards 



