Lobus lineatus Naskar, Banerjee et Parui, 2018

Naskar, A., Maity, A., Homechaudhuri, S., Parui, P. & Banerjee, D., 2018, A new species of the genus Lobus Martin (Diptera: Asilidae) from West Bengal, India, Far Eastern Entomologist 367, pp. 21-25 : 22-24

Lobus lineatus Naskar, Banerjee et Parui , sp. n.

Figs 1 –10

TYPE MATERIAL. Holotype – male, India: West Bengal, Darjeeling, Sureil , 26.969 o

N, 88.354 o E, h~ 5048.3 ft, 11.X–31.X 1917, coll. N. Annandale. & F.H. Gravely; deposited in NZC, Kolkata. Paratypes – 4 males, the same label as in holotype, deposited in NZC,

Kolkata.

DESCRIPTION. Male holotype. Body length 14.4 mm; wing length 8.7 mm ( Fig. 1 ) .

Head ( Fig. 2 ). Eyes in the middle below antennae as wide as flagellomere, then gradually broadening up to epistome bearing white tomentum; mystax brownish comprising of four macrosetae; frons and vertex golden tomentose; ocellar tubercle brown; occiput dark brown,

bare. Antennae yellow, style as long as flagellomere I. Palpi linear, yellowish with concolourous macrosetae. Proboscis light brown.

Thorax uniformly light brown, sides paler with yellow tomentum ( Fig. 3 ). Episternum and anepimeron golden pollinose, anepisternum brown pollinose; chaetotaxy: only intraalar

I. Scutellum brown tomentose with a row of six thin setae on posterior margin).

Legs uniformly brownish yellow except coxae and trochanters darker and bare. Fore tibia with a row of fine macrosetae ventrally all over. Hind femur narrow at basal half, rest swollen ( Fig. 4 ). Hind tibia bears a comb of macrosetae ventrally almost on apical half. All tarsal segments with a stout macrosetae except the apical one).

Wings (Fig. 5). Vein M1 narrowly sinuous; forking of the anterior branch of 3rd

longitudinal veins (R4) which end below wing tip.

Abdomen linear, uniformly brown each segment on posterior margin and bears a few macrosetae laterally on posterior margin (Fig. 6).

Terminalia black with black setae. Epandrium bifurcate, upper arm curved and gradually tapered towards apex, lower arm thumb shaped, lobos cone shaped, hypandrial apodemes flat, proctiger broadened at apex (Figs 7–10).

DISTRIBUTION. India (West Bengal).

BIOLOGY. Unknown.

ETYMOLOGY. The new species is named after long cylindrical body, specifically with respect to its typical abdominal shape and length.

thorax, lateral view; 4 – hind leg, dorsal view. Aepm – anepimeron; Aeps – anepisternum;

Keps – kateepisternum; Lter – laterotergite; Me – meron; Pn – pronotum; Ps – pleural suture;

Ptn – postnotum; Ptpn – post pronotum; Sct – scutum; Sctl – scutellum.

DIAGNOSIS. New species fits with the genus Lobus in respect of the lobos, which is cone-shaped here; the shape of antenna bearing the style projected from dorsal surface of third antennal segments. Posterior margin of scutellum with weak setae and forking of the anterior branch of 3rd longitudinal veins (R4) which end below wing tip.

New species most similar to L. bandipurensis in the general shape of the male terminalia but distinctly differ from it in the details structures and also differs in other characters: large size, coloration of wing uniformly yellowish and not infuscated; fore tibia bears a row of fine macrosetae ventrally wholly and hind tibia with a comb of macrosetae ventrally on apical half but absent in the latter; and with only one intra-alar and no other setae on thorax. A key to Indian species of Lobus modified and added after Joseph & Parui (1998) is given below.

terminalia, dorso-lateral view (showing epandrium and proctiger); 8 – the same, lateral view

(showing bifurcated epandrium and flat hypandrial apodeme); 9 – the same, dorsal view; 10 –

the same, ventral view. 1A – first anal cell; 2A – second anal cell; 3A – third anal cell; AT1–

AT8 – first–eight abdominal tergites; Cu2 – second branch of cubital vein; Ep – epandrium;

Hyp – hypandrial apodemes; Lo – lobos; M – medial cell; M1–M4 – first–fourth medial veins; R1 – first radial vein; R2+3 – second and third redial vein joined together; R4 – fourth radial vein; R4+5 – fourth and fifth radial vein joined together; R5 – fifth radial vein.

Figures

Figs. 1–4. Holotype male of Lobus lineatus sp. n. 1 – habitus; 2 – head, lateral view; 3 –