44 E. E. AUSTEN. 



Bouvierella inornata, sp. n. 



$. — Length (2 specimens) 10 to 11 '2 mm. ; width of head 3 '25 to 3*6 mm. ; width 

 of front at vertex 0*4 mm., at lower extremity 0*25 mm. ; length of wing 9 to 10 mm. 



Sombrely coloured species, entirely devoid of markings ; ground-colour of dorsum 

 of thorax drab* or dusky drab, that of dorsum of abdomen greyish fuscous ; front in 

 2 narrow, slightly yiarrower at lower extremity than at vertex, about six times as long 

 as its width at upper end ; tvings, especially portion beyond basal and anal cells, strongly 

 suffused with brownish, stigma well marked ; coxae drab, legs otherwise blackish brown, 

 extreme tips of femora, at least of those of front pair, ochraceous buff. 



Head : front, subcallus, face, sides of face and jowls drab, occiput smoke-grey ; 

 vertex clothed with minute, erect, blackish-brown hair, sides of face with ochraceous- 

 brownish hair, basi-occipital region with longer fine brownish hair ; frontal callus 

 represented by a fine, dark, median line, commencing at some distance above level 

 of lower inner angle of eyes, and not reaching anterior ocellus ; proboscis, including 

 labella, narrow and elongate, total length of proboscis about two-thirds of the^t of 

 head ; proximal joint of palpi dark brown or brownish, terminal joint similarly 

 coloured on outer surface, narrow, curved, elongate and very slender ; antennae 

 -dark brown, first and second joints clothed above and below with short, blackish 

 hair, expanded portion of third joint ovate or elongate ovate when viewed in profile, 

 without any angle on upper margin, annulate portion of third joint narrow, curved 

 and elongate. Thorax : dorsum clothed with short, recumbent brownish hair, 

 which in front of prescutellar groove may be mixed with paler hair, scutellum bearing 

 longer brov/nish hair, or a mixture of brownish and ochraceous hair ; pleurae and 

 pectus agreeing in coloration with dorsum, and clothed with fine, brownish hair. 

 Abdomen : dorsum clothed with short, appressed dark, brown hair, venter agreeing 

 witli dorsum in coloration and hairy covering. Wings : lengths (relative as well 

 as actual) of stalks of firvSt and fourth posterior cells variable in difierent specimens ; 

 stigma elongate, dark brown. Squamae light drab or drab-grey, borders drab. 

 Halteres : knobs clove-brown or blackish brown, stalks paler (cinnamon-bufi). 

 Legs sparsely clothed with short or minute dark brown or blackish hair. 



Seychelles Is. Type from Silhouette (plateau of Mare aux Cochons, about 1,000 

 feet,'ix. 1908) ; a paratype from Mahe (Cascade Estate, 800-1,000 feet), 1908-9. 



Bouvierella inornata is distinguishable from all previously described species 

 belonging to this genus, inter alia, by its uniformly sombre coloration, the ground- 

 colour of the thorax and abdomen not being reheved by either lighter or darker 

 markings. In particular, it is distinguished from B. brunnea, Surcouf (Bull. Mus. 

 Hist. Nat., 1909, no. 4, p. 179), a species found in Madagascar, by its smaller size, 

 and by the more uniformly dusky coloration of the body and legs, the dorsum of 

 the thorax not being longitudinally striped with grey, and the legs not being reddish 

 yellow, clothed with golden pile. 



In the length and slenderness of the proboscis, including the labella, the species 



just described agrees rather with Aegophagamyia, Austen, with which it constitutes 



in this respect an annectent link ; as regards antennal characters and the shape 



of the first posterior cell, however, the species seems more correctly placed under 



Surcouf's genus. 



* For names and illustrations of colours, see Ridgway, " Color Standards and Color 

 Nomenclature " (Washington, D. C. : published by the Author, 1912). 



