60 H. C. EFFLATOUN. 



second pair (on the third segment) are deep, generally the deepest, 

 and rather lnnulate, their inner ends being very close to the 

 front margin, while their outer front ends, which are connected 

 narrowly with the side margins, are some distance from the front 

 margin; these lunules are rather flat below and very commonly 

 either faintly or distinctly connected at about their middles, some- 

 times forming a broad orange band; the third pair of markings 

 (on the fourth segment) are somewhat similar to the second, but 

 their inner ends, opposite the front margin are wider and their 

 lower sides slope upwards, but they are also liable to great varia- 

 tion ; the lower margin of the fourth segment is orange ; the fifth 

 segment is almost entirely orange except for an obscure black 

 line along the middle of its base, which at times is scarcely visible 

 ::jid sometimes thickened into a dark blotch. The pubescence on 

 the abdomen is long and yellow about the basal corners, whitish 

 on the large genitalia, but elsewhere short and rather inconspic- 

 uous, mainly following the ground colour, except for some pale 

 hairs on the black disc of the basal segment; the marginal hairs, 

 after the base are all black even where the yellow markings extend 

 over the side margins. Venter with the basal orange markings 

 seen by transparency, but are vaguely more extended. Hypopy- 

 gium very large, with the big knob shining seneous-black, but the 

 lower knob usually dark orange, although in some rare cases it 

 may also be black. 



Legs orange, but the basal half of the anterior femora and the 

 basal two-thirds of the hind femora and the tarsi are brown above. 

 Pubescence on femora moderate, mainly pale after the front pair, 

 but with a slight black fringe behind, on the yellow portion, which 

 fringe is more conspicuous on the middle femora, which otherwise 

 have their longer pubescence pale ; the hind femora are covered 

 with minute black bristles and possess very few hairs ; there are 

 also some minute black bristles on the hind tibiae, except about 

 the inner side of the apex. 



Wings rather broad, pellucid, but blackish at the extreme base, 

 then yellowish, with the stigma usually even darker. SquamulaB 

 w hitish-yellow, with yellower margins and fringes. Halteres yellow. 



Female: — Similar to most males, but the yellow abdominal 

 markings are much smaller and always well separated ; they are 

 more lunulate on their upper edge and more widely connected with 

 the side margins ; the fifth segment usually has broad orange sides, 

 which are connected with a narrow orange hind margin, hence leav- 

 ing only the middle black. Frons shining black on the upper 

 third, with a somewhat indefinite lower limit, which is sometimes 

 vaguely prolonged ; there are often a pair of small dark lunules 



