Efferia nigritarsis (Hine)

Scarbrough, Aubrey G. & Perez-Gelabert, Daniel E., 2008, Review of the West Indian species of Efferia Coquillett (Diptera: Asilidae): Part 1. Bahamas, Cayman Islands, Cuba, and Jamaica, Insecta Mundi 2008 (49), pp. 1-29 : 21-22

Efferia nigritarsis (Hine)

Fig. 1 , 4e, 36-38

Erax nigritarsis Hine 1919: 128 .

Nerax nigritarsis (Hine) , Hull 1962: 478. Combination.

Efferia nigritarsis (Hine) , Martin and Papavero 1970: 66. Combination.

Redescription. Male. Body 15.8 mm, wing 11.9 mm. Head: Face, frons, vertex yellowish-gray or gray tomentose; vestiture whitish, at most a slight tint of yellow; mystax with 1-6 black bristles medially. Face at antennae 2/3 as wide as eye. Palpi mostly white setose, usually black setae on apical 1/4. Proboscis white setose. Antennae black, black setose, sparse whitish setae below pedicel. Frons whitish setose. Ocellar tubercle with 2 black setae as long as 3 antennal segments combined. Occiput grayish tomentose, whitish setose, dorsal postocular bristles pale yellowish.

Thorax: Scutum brown median stripe and 2 spots laterally, yellow tomentose, prescutellum yellowish-gray; vestiture black, sparse yellow setae laterally, setae abundant, anterior scutal setae subequal in length to scape; dorsocentrals thin posteriorly, 5-6 per row; lateral bristles thick. Scutellum pale yellowish or whitish setose dorsally, as long as scape; 5-6 pale yellowish, marginal bristles, one of these thin. Pleura yellowish tomentose anteriorly, yellowishgray posteriorly, setae yellowish. Halter stalk yellow, knob reddish. Wing: Hyaline, costal cell brownish. Costal margin slightly dilated, sometimes costa vein straight, only thick; Crossvein r-m longer than CuA 1 +M 3, just before or at apical 1/4 of cell d. Cell r 1+2 beyond apex of cell d, base narrow; R 4 recurrent vein short or absent, about 1/5 or less than diameter of cell r 4 basally. Legs: Coxae, trochanter, and femora black, coxae whitish tomentose with whitish vestiture. Femora mostly pale yellow or whitish setose, black dorsoapically, setae long, abundant below prothoracic and mesothoracic femora; 4-5 bristles on mesothoracic femora and 2-3 anteroventral bristles on metathoracic femora black, anterior bristles mostly creamy white. Tibiae mostly yellow, apices black; bristles black. Tarsi reddish-black, tarsomeres pale basally, metathoracic tarsus entirely blackish; bristles and setae black. Abdomen: Segments 6-7 white tomentose, tergites brownish dorsally, wide sides brownish- Figure 36-38. Male terminalia of Efferia nigritarsis

(Hine), lateral views; 36. intact terminalia; 37. gray; setae mostly whitish or yellowish on basal 3

gonostylus; 38a-b. phallus with aedeagus, aedeagal tubes, tergites; sternites 1-7 gray tomentose, setae white, and phallic flanges. erect, long on basal 3 sternites, much shorter posteriorly; sternite 8 produced apically with unusually dense black setae. Terminalia (Fig. 36-38): Black, black setose. Epandrium twice as long as wide, apex wide, somewhat truncate in dry specimens, apical margin narrowly membranous. Gonostylus narrow, apex capitate. Phallus with moderate flanges, margins gradually sloped; aedeagus abruptly angled 90 degrees. Gonocoxite abruptly narrowed apically, apex Figure 39. Female terminalia of Efferia pilosula

(Bromley), lateral view. acuminate; setae dense, longer posteriorly than ventrally. Female. Body 12.9 mm; wing 9.6 mm. Head: Mystax with 2-11 black bristles dorsally; face 1/2 as wide as eye. Apical 1/3 of palpi black setose; frons mostly pale, 2-3 setae and postocular bristles black. Thorax : Scutellum with 5 marginal bristles, 1 black; setae slightly shorter than scape. Wing : Recurrent vein about as long as diameter of cell r 4 base. Halter yellow. Abdomen : Sternites 1-6 and wide sides of tergites 1-6 gray tomentose, pale setose; tergites brown tomentose dorsally, tergite 7 glossy, tomentum sparse; tergites 3-7 and apical 1/2 of sternite 7 blackish setose. Terminalia : At middle 1/9.5 as wide as long; cercus 1/2 as long as tergite 9. Spermatheca slightly longer than wide (Fig. 4e). Types examined. CUBA: Holguín [Holguín province] / 19.xii.1904 (holotype m, OSUC 0186802). Paratype: Holguín / 19.xii.1904 ~ Allotype [red label] (f, 0SUC 0186799). Other material examined. Holguín /?. v. 1905 (m, OSUC 0186801). Distribution. Cuba, Holguín province; April, December. Remark. In addition to the characters in the key, Ef. nigritarsis is distinguished from congeners by the pale scutellar setae and bristles, somewhat truncate membranous apical margin of the epandrium, strongly capitate gonostylus, abruptly apically narrowed gonocoxite, and produced sternite 8 (Fig. 36-38) .

Figures

Figure 1. Distribution of Efferia in the Bahamas, Cayman Islands, Cuba, and Jamaica.