302 A. L. MELANDER. 



Empis rufescens Loew (Fig. 120). 

 Cent. V, 52. 



Male. — Yellow, reddish above. Thorax siibopaque, abdomen shining. Head 

 black, cinereous with whitish pollen. Eyes narrowly separated on the front. 

 Antennse moderate, rather stout, the first two joints red, the third black, the 

 terminal style moderate. Proboscis yellow, longer than the front tibiae. Dor- 

 sum of the thorax provided with a few black hairs and bristles. Hypopygium 

 yellow, rather long, ascending, closed, the lower lamellae long, the upper small, 

 short-ovate, the central filament exserted, low, slender, curved, yellow. Legs 

 slender, clothed with short black hairs and setulae, yellow, the first two tarsal 

 joints apicallyand the other three wholly black. Wings cinereous with a yellow- 

 ish tinge, veins fuscous, becoming luteous towards the costa and base, stigma 

 very pale, subfuscous. 6.1 mm. 



New Hampshire (Osten Sacken). Massachusetts (Hough). 



Einpis riibicla Wheeler et Melander (Fig. 121). 

 Biol. Cent. Am., Dipt. Suppl., p. 368, Nov.. 1901. 



Female. — Front and face shining black. Antennae reddish yellow ; third joint 

 slender on the distal part, the style slender, aristiform. Proboscis yellow, not 

 longer than the head. Mesonotuni shining, yellowish red, strongly convex; 

 bare; pleurae yellower. Abdomen brownish yellow. Legs light yellow, not dila- 

 ted or ciliated ; tip of all the metatarsi and the remaining tarsal joints, the tips 

 of the hind femora and tibiae blackish. Wings cinereous hyaline, with yellow- 

 ish veins; stigma elongate, brown; anterior branch of the third vein nearly 

 rectangular and gently arcuated. Halteres yellow. 4 mm. 



Guerrero, Mexico (Smith). 



Empis otiosa Coquillett (Fig. 122). 

 Proc. Nat. Mus., 1895, p. 407. 



Male. — Head black, gray pollinose, eyes separated as widely as the posterior 

 ocelli, facets of a uniform size; antennae black, third joint two and one-half 

 times as long as the first, rather narrow, style one-third as long as the third joint; 

 proboscis two and one-half times as long as the height of the head, palpi yellow. 

 Thorax black, opaque gray pollinose, marked with two darker vittae, its sparse 

 pile and bristles black; pleura black, gray pollinose, its pile black; scutellum 

 gray pollinose, bearing four bristles. Abdomen black, depressed, except towards 

 apex, subshiniug, its pile rather abundant and long, black ; hypopygium rather 

 small, middle lamella longer than the upper, rounded on the lower side ; filament 

 rather slender, yellow. Legs simple, very robust, femora nearly twice as thick 

 as their tibiae, hind femora one-third longer than the middle ones; coxae black, 

 femora dark brown, yellowish at base and apex, the hind ones sometimes wholly 

 yellowish, tibiae and tarsi light yellow, apex of the latter brown ; front metatarsi 

 unusually large, nearly twice as long and as thick as the middle ones, one-half 

 thicker and one-third longer than the hind ones. Knob of halteres light yellow. 

 Wings hyaline, stigma pale bi'ownish, veins dark brown. 



Female. — Same as the male, except that the tibiae and tarsi are darker, the yel- 

 low being replaced with reddish ; the femora are usually reddish and are more 

 slender; the hind ones are nearly twice as long as the middle ones; front meta- 



