Tolumnia basalis Dallas

Tolumnia basalis Dallas

(Fig. 1 A)

Tolumnia basalis: Dallas (1851) [ 2] List, p. 237

Female

Measurements (mm): Head length: 1.70; width across eyes: 1.12; interocular space: 1.10; interocellar space: 0.60; preocular distance: 0.92; length of posterior head including eyes: 0.77; antennal segments lengths: I: 0.50, II: 0.90, III: 1.05, IV: 1.20, V: 1.57; pronotal length: 2.0; width across humeral angles: 5.28; scutellar length: 3.60; scutellar width: 3.30; length of abdomen: 4.50; maximum width of abdomen: 5.28; length of rostral segments: I: 0.80, II: 1.20, III: 1.00, IV: 0.85; Distance - base scutellum-apex clavus: 2.87; apex clavus-apex scutellum: 0.68; apex scutellum-apex abdomen including membrane: 2.75; total body length: 10.

Dorsal Coloration: Head brownish-yellow with black punctures; inner and outer margin of paraclypei and posterior margin of head black, medial clypeal area scarcely punctate, area around eyes brownish-yellow; eyes blackish-red; ocelli pink; antennal segments 1st, 2nd and 3rd brownish-yellow, basal one-third of 4th and half 5th pale-whitish, rest black; pronotum brownish-yellow, coarsely and densely punctured with black; anterior and lateral two-thirds margin of pronotum and humeral angles brownish-yellow, rest black; anterior margin of pronotum with two transverse brownish-yellow callosities, bordered with black punctures; scutellum brownish, punctured densely with dark black color; scutellar base with irregular maculate pale yellow patch, apex pale yellow and impunctate; clavus, corium and costal margin is admixture of red, green and yellowish tinge; costal margin thickly punctured with black, except anteriormost costal margin pale yellow; connexiva pale yellowish-brown, anterior and posterior margins with distinct black patch; hemelytral membrane suffused with black and brown, outer margin translucent.

Ventral Coloration: Labium pale yellow with dark brown central area and black apex; head pale yellow, except lateral margins and below antennal segment black; sternum yellow, punctate with double series of four black spots, one on anterior margin of sternite, one on base of coxae; metasternite with additional pair of spots on lateral margin; metathoracic scent gland opening pale yellow and impunctate, evaporatorium pale whitish; abdomen finely punctured, admixture of pale brownish yellow with green tinge; genital capsule brownish yellow; spiracles yellow; lateral margin of abdomen pale; connexiva concolorous to dorsal surface; legs brownish yellow, finely spotted with black, tarsi darker.

Structure

Head (Fig.1 B): Head longer than broad, moderately declivent, subrounded at apex; paraclypei subequal to clypeus, latter slightly lobulated and medially raised; lateral margins of paraclypei slightly sinuous above eyes, reflexed anterolaterally and arrowed at apex; Ist antennal segment not reaching apex of head; antennal segmental formula – I<II<III<IV<V; labium long, slender just reaching metacoxae; labial length formula – I<IV<III<II; Thorax: Pronotum (Fig.1 C) about 2.5X wider than long, moderately deflected anteriad, calloused posteriad with anterior margin concave, subtruncate behind eyes, protruding as small tuberculate obtuse angles anterolateral, lateral margins smooth, obliquely straight; humeral angles subprominent and obtuse; frenal region distinctly greater than post-frenal, beyond frena narrowed as subtriangular apical lobe; connexiva well exposed at repose dorsally; metathoracic scent gland osteolar peritreme (Fig.1 D) long, elongated, sinuously concave, narrowed acutely at apex, reaching about three fourth way to metapleural margin; evaporatorium with well-developed equally extended anterior and posterior margins, medially concave forming V-shaped structure covering two-third area of sternite; legs without any modifications, femora slightly pilosed, tarsi and posterior end of tibiae pilosed with golden pubescence; abdomen medially convex, depressed laterally; connexiva exposed at repose; genital capsule with golden pubescence; ventral anterior margin of VIIth abdominal sternite concave, somewhat an inverted U-shaped, with acute posterior angles (Fig.1 E); hemelytral membrane passing moderately beyond apex of abdomen.

Female Genitalia: 1st gonococcie subtriangular, sinuate on inner margin; 2nd gonococcie somewhat rectangular, anterior margin sinuate; 8th paratergites elongate, triangular; 9th paratergites broad, lobulate, subrounded at posterior margin, not passing beyond fused posterior margins of 8th paratergites (Fig.1 F); spermatheca (Fig.1 G) with distinct distal and proximal flanges; pump region small, spiral tube like, distinctly shorter than distal spermathecal duct; bulb elongate with two finger like processes; proximal spermathecal duct distinctly longer than distal spermathecal duct.

Material Examined

Himachal Pradesh: Paonta Sahib , 04. x. 2009 - 1♀

Uttarakhand: Sahastradhara , 16. ix. 2010 - 1♀

Distribution: India (Uttarakhand, Himachal Pradesh, Meghalaya).

Remarks: The species closely resembles T. maxima and T. latipes in general body form, but can be easily separated from the two in having scutellar base with transverse extensive pale fascia forming distinct irregular band; antennae with 1st and 2nd segments brownish yellow and spermathecal bulb with two distinct finger like processes as compared to scutellum with distinct pale basal angular spots; antennae piceous with bases of joints paler and spermathecal bulb without distinct finger like processes in the mentioned species. It is a new record from North India.