Bombyliidae (Bee Flies) - Southern Africa's Journal

Journal archives for February 2024

February 08, 2024

Phthiria laeta Bezzi, 1921

Genus Phthiria Meigen, 1803.
The Phthiriinae are readily separated from the similar looking Usiinae by the first antennal flagellomere, which in Phthiriinae has a subapical sulcus bearing a style and dorsal and/or ventral processes; also wing vein M2 is present (four posterior cells). Only the nominate genus, Phthiria, is present in Southern Africa.
Sexual dimorphism of adults is present and distinct: Males have holoptic eyes and are usually dark or black with infrequent pale coloration; females usually are paler with bands on the abdomen and/or vittae on the thorax or other distinct patterns.


Phthiria laeta Bezzi, 1921
While most Phthiria species occur in the Western and Northern Cape, this is the only Phthiria known from the NE parts of South Africa. Female easily identified by the black and yellowor pale banded abdomen and the reddish legs. Body on the whole less humped and broader than in other species.

Original description in:
Bezzi, M. 1921. On the bombyliid fauna of South Africa (Diptera) as represented in the South African Museum. Annals of the South African Museum 18
https://www.biodiversitylibrary.org/page/1540304#page/112/mode/1up

Female:
Head reddish, quite opaque; occiput broadly black in the middle; frons with a longitudinal, black, median stripe.
Antennae quite black, with the third long joint, about linear, ciliated above, with very short terminal style at its upper angle.
Thorax blackish and opaque on the back, with a fine dark grey tomentum and with whitish hairs; the humeri, a narrow stripe above the notopleural line, a broader stripe above the root of the wings and the postalar calluses yellow; the hairs are long and whitish. Scutellum yellow, with a very narrow basal black stripe.
Abdomen rather swollen and convex, quite opaque, clothed with whitish hairs; each segment is of a deep black colour, with a proportionally broad, equal and complete yellow stripe at the hind border; the second segment has the black part twice as broad as that of the following segments.
Legs reddish, with pale yellow coxae, infuscated tibiae, and blackish tarsi; anterior femora with a black longitudinal stripe on the outer side.
Wings greyish hyaline, with yellowish stigmae; veins black, with yellowish base; discal cross-vein placed at about the middle of the discoidal cell; cubital fork about three times as long as broad at end; anal cell briefly stalked.

Description of male in:
Hesse, A.J. 1975. Additions to the South African species of Phthirinnae and Usiinae (Diptera: Bombyliidae) with keys to all the known species. Annals of the South African Museum 66
https://www.biodiversitylibrary.org/page/40911307#page/351/mode/1up

Male: Body mainly black, only narrowish hind margins of sternites pallid; broadish hind margins of tergites on sides appearing greyish white, due to greyish white tomentum.

Distribution: Gauteng & KZN Drakensberg (Van Reenen)

iNat observation: https://www.inaturalist.org/observations/153442998

Posted on February 08, 2024 12:50 PM by traianbertau traianbertau | 0 comments | Leave a comment

Bombylella rufiventris (Macquart 1846)

This species is easily recognised by the whitish hair on the thorax in front in males, the presence of reddish or reddish yellow, depressed scaling on scutellum and disc of abdomen above, especially in females and the black hair tufts on the side of the abdomen.

Original description in:
Macquart, P.J.M. 1846. Diptères exotiques nouveaux ou peu connus. Supplement. [1]. Mem. Soc. R. Sci. Agric. Arts, Lille 1844
https://www.biodiversitylibrary.org/item/109525#page/118/mode/1up

Translated from Latin & French:
Red hairy. The apex of the abdomen is black, with white dorsal spots.
Face and fron black; a tuft of white hairs on each side of the face and on the posterior edge of the vertex. Antennae black. Thorax with patch of white hair on the shoulders. Abdomen with reddish scales; tufts of black hair on the sides. Legs black. Wings clear; a little yellowish at the base and outer edge; small cross vein located at one third of the discoidal cell; anal cell half-open.

Rediscription in:
Greathead, D. J. 1999. A review of the Afrotropical species of Bombylella Greathead (1995) (Diptera: Bombyliidae). Journal of Natural History, 33(7), 999–1020. doi:10.1080/002229399300056
https://sci-hub.ee/10.1080/002229399300056

Black. Hair black and with pale yellow hair on the occiput, underside of head, thorax, forming a dense band across the mesonotum of the male in front of the wings and dorsal surface of the abdomen. Plumula white. Decumbent red- gold hair-like scales present beneath the hair on the dorsal surface, sparse in males and dense in females. Silver scale spots present on head and abdomen of males and also on thorax of females which have the full complement of spots and the submedian streaks, also a silvery-white patch on the katepisternum. The spots at the sides of abdominal terga 5 and 6 are large and composed of upright scales in both sexes. Abdominal sterna with well-developed bands of silvery-white scales. Legs dark brown and with silvery scales on the posterior sides. Wings with yellow basal infuscation to vein MA only. Veins yellow-brown, r-m cross-vein slightly before middle of discal cell, m-m absent. Alula distinctly longer than wide. Squamal fringe white. Haltere dark blackish brown, paler at apex of knob. Body length, 5-7 mm.

Distribution: Botswana, Kenya, Malawi, South Africa (Kwa-Zulu-Natal, Northern Province), eSwatini, Zambia, Zimbabwe.

iNat observation: https://www.inaturalist.org/observations/78219679

Posted on February 08, 2024 05:28 PM by traianbertau traianbertau | 0 comments | Leave a comment

February 14, 2024

Euligyra coleoptrata (Bezzi, 1921)

A black-golden fly with dark brown wings: Scaling on thorax and base of scutellum mostly black, not yellowish ochreous or rufous, and black scaling on abdomen above very extensive, leaving only the scales on reddish parts on sides reddish yellowish. Wings distinctly dark bronzy brownish, the infuscation uniform, with violaceous reflections, with the darker spot-like infuscations on cross veins very feebly indicated.

Original description in:
Bezzi, M. 1921. On the bombyliid fauna of South Africa (Diptera) as represented in the South African Museum. Ann. S. Afr. Mus. 18
https://www.biodiversitylibrary.org/page/1540304#page/180/mode/1up

Redescription in Hesse 1956:
https://www.biodiversitylibrary.org/page/40844208#page/945/mode/1up

Distribution: KwaZulu-Natal, South Africa

iNat observations:
https://www.inaturalist.org/observations/173755224
https://www.inaturalist.org/observations/9172015

Posted on February 14, 2024 05:45 PM by traianbertau traianbertau | 0 comments | Leave a comment

February 16, 2024

Exoprosopa strenua Loew, 1860

Large species with distinctive wing pattern: Base and band of wings black-brown, lower base and edge anteriorly more rusty, a wide clear incision between the base and the band ascending diagonally from the posterior margin, veins in the gray tip of the wings edged with whitish.

Description & illustration in:
Loew, H. 1860. Die Dipteren–Fauna Südafrika's. Erste Abtheilung. Abhandlungen des Naturwissenschaftlichen Vereins für Sachsen und Thüringen
https://www.biodiversitylibrary.org/item/35325#page/246/mode/1up

Description in Hesse 1956:
https://www.biodiversitylibrary.org/page/40844208#page/826/mode/1up

Type locality: South Africa, Western Cape

iNat observations: https://www.inaturalist.org/observations?place_id=any&taxon_id=666332

Posted on February 16, 2024 12:47 AM by traianbertau traianbertau | 0 comments | Leave a comment