Astochia similis, Londt, Jason G. H., 2019

Londt, Jason G. H., 2019, A revision of Afrotropical Astochia Becker, 1913 with descriptions of three new species (Diptera, Asilidae, Asilini), African Invertebrates 60 (2), pp. 215-237 : 226-228

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Astochia similis

sp. nov.

Astochia similis sp. nov. Figs 20 View Figure 20 , 21-23 View Figures 21–23 , 26 View Figure 26


L. similis, like, resembling. So named because of a close resemblance to A. sodalis .


Based on unique holotype specimen.

Head: Dark red-brown to black, silver pruinose, black and white setose. Antenna dark red-brown to black, scape and pedicel black and white setose, postpedicel slightly laterally compressed. Relative lengths of segments (scape as 1) scape 1, pedicel 0.6, postpedicel 1.5, style 2.2 (0.1: 2.0: 0.1 - composed of a tiny basal element followed by a long, thin, seta-like element and tipped with a tiny sensory element). Face black, ventral 2/3 slightly protuberant, entirely strongly silver pruinose. Mystax entirely white, confined to protuberance. Frons black, silver pruinose, black and white setose. Vertex black, silver pruinose, strongly concave. Ocellar tubercle weakly pruinose, with c. 6 black, weakly developed ocellar macrosetae. Occiput uniformly silver pruinose, few black (dorsally) and white setae. Palps dark red-brown, single segmented, white setose. Proboscis dark red-brown to black, straight, white setose.

Thorax: Dark red-brown to black, silver pruinose, black and white setose. Antepronotum dark red-brown, silver pruinose, white setose. Mesonotum dark red-brown to black, patterned with silver pruinescence (central longitudinal stripe and lateral patches apruinose), entirely black setose except for postpronotal lobes and posterior margin which are fine white setose. Lateral macrosetae black (1 posthumeral, 2 notopleurals, 2 supra-alars, 2 postalars). Scutellum dark red-brown to black, entirely silver pruinose, with 2 black apical macrosetae, disc fine white setose. Pleura dark red-brown, entirely silver pruinose, fine white setose. Katatergal setae moderately well developed, white. Anatergites fine white setose. Postmetacoxal area membranous.

Legs: Orange-brown except for anterior surfaces of femora which are dark red-brown. Coxae silver pruinose, white setose. Trochanters weakly white setose. Femora black and white setose. Tibiae and tarsi mostly black setose. Claws, pulvilli and empodia well developed.

Wings ( Fig. 20 View Figure 20 ) Length (humeral crossvein to tip) x breadth (maximum): 9.5 × 3.1 mm. Veins dark red-brown, membrane transparent, weakly microtrichose distally (confined to small areas of cells c, sc, r 1, r 2+3, r 4, r 5, m 1), cells m 3 and cua closed and stalked.

Abdomen: Dark red-brown to black, silver pruinose, black and white setose.

Male terminalia ( Figs 21-23 View Figures 21–23 ): Unrotated. Epandrium simple, c. twice as long as high in lateral view ( Fig. 21 View Figures 21–23 ), distally rounded. Dorsally epandrial lobes almost circular in appearance, each lobe lacking obvious projections. Proctiger simple, dorsal lobes appear fused medially, and distal ends diverge. Hypandrium relatively moderately developed, hind margin straight ( Fig. 23 View Figures 21–23 ). Gonocoxite subtriangular in lateral view, somewhat pointed distally ( Fig. 21 View Figures 21–23 ), distal lobes converging in ventral view ( Fig. 23 View Figures 21–23 ). Gonostylus moderately well developed, lobelike, gently dorsally directed and slightly divergent. Aedeagus well developed, relatively stout and appearing forked distally ( Fig. 23 View Figures 21–23 ).

Female: Unknown.

Type material.

Holotype. Nigeria: 1♂ holotype 'Nigeria / Soedan Savanne [?] - / Zône - febr, '74 / leg: Feith en den Boer’, ‘NMSA-DIP-03385’ (NMSA).

Distribution, phenology and biology.

Known only from Nigeria. While no precise location is recorded the words 'Soedan Savanne’ suggest a north-easterly location, perhaps near Lake Chad (c. 11°N, 12°E - Fig. 26 View Figure 26 ), where the environment could be described as savanna. Collected in February (Table 1 View Table ).