Prenolepis naoroji

This species is relatively common in the northern India and can be found on trees, fallen trunks, and occasionally on ground. P. naroji, was mostly collected by beating on vegetation, indicating that it is an arboreal forager. (Bharti and Wachkoo 2012)

Identification
Bharti and Wachkoo (2012) - The workers of Prenolepis naoroji are identified easily by the long scapes and setae, and bulging eyes. However, there is a considerable variation in size and color patterns.

Prenolepis of India


 * Scapes short, surpassing posterior margin of head by less than half their length (SI: 101.51-109.68), ocelli present . . . . . Prenolepis fisheri


 * Scapes very long, surpassing posterior margin of head by about half their length (SI: 153.85-182.35), ocelli absent . . . . . Prenolepis naoroji

Distribution based on Regional Taxon Lists
Indo-Australian Region: Indonesia, Malaysia. Oriental Region: India, Nepal, Sri Lanka, Thailand, Vietnam. Palaearctic Region: China.

Nomenclature

 *  naoroji. Prenolepis naoroji Forel, 1902d: 290 (w.) INDIA.
 * [Misspelled as navrojii by Collingwood, 1970: 379.]
 * Bharti & Wachkoo, 2012d: 124 (q.m.).
 * Status as species: Bingham, 1903: 331; Wu, J. & Wang, 1992: 1313; Bolton, 1995b: 364; Wu, J. & Wang, 1995: 138; Xu, 1995c: 338 (in key); Zhou, 2001b: 172; Bharti & Wachkoo, 2012d: 122 (redescription).
 * Senior synonym of longiventris, magnocula: Williams & LaPolla, 2016: 234.
 * longiventris. Prenolepis longiventris Zhou, 2001b: 173, 241, fig. 343 (w.) CHINA.
 * Junior synonym of naoroji: Williams & LaPolla, 2016: 234.
 * magnocula. Prenolepis magnocula Xu, 1995c: 339, figs. 4-6 (w.) CHINA.
 * Junior synonym of naoroji: Williams & LaPolla, 2016: 234.

Description
Bharti and Wachkoo (2012):

Worker
78.67-89.23; SI 153.85-182.35 (n = 20).

Head. Head broadly oval, longer than broad, broader posteriorly than in front, occipital margin straight with rounded corners, sides convex. Anterior margin of clypeus broad, with a slight medial emargination; longitudinally carinate in the middle. Mandibles with 6 teeth on the masticatory margin, counting from apex 3rd and 5th teeth are reduced. Eyes round, large and bulging; ocelli absent. Antennae remarkably long, scapes extending about 1/2 of their length beyond occipital margin of head, flagellum filiform. Frontal carina feeble, short and diverging.

Mesosoma. Mesosoma rather long, strongly constricted in the middle; in side view convexity formed by pronotum and mesonotum together, is sub equal to propodeal convexity; declivous face obliquely truncate.

Petiole. Petiole low with shallow emargination, less compressed anteroposteriorly than in Prenolepis fisheri, triangular in profile, inclined forward, with posterior face longer than anterior face.

Gaster. Gaster elongate and gibbous.

Sculpture and pilosity. Cuticular surface smooth and shining; devoid of pubescence. Remarkably long setae of varying lengths cover the whole insect, denser on gaster and longest on head, reaching up to 0.41 mm.

Color. Castaneous to dark piceous brown; mesosoma, mandibles, antennae and legs lighter.

Queen
Measurements: HL 0.97; HW 1.08; WL 1.8; SL 1.21. Indices: CI 111.34; SI 112.08 (n = 1).

As in worker, with modifications expected for caste and the following differences: overall color darker than in workers, with head and gastral dorsum brown; mesosoma with lighter reddish brown patches especially on scutum and propodeal declivity. Entire body punctured, but more pronounced on head followed by mesosoma; setae of varying lengths cover entire body but longer ones restricted to head and shorter, denser ones on gaster, with only a few on mesosoma; pubescence most abundant on gaster. Mandibles 6-toothed. Mesosoma without any constriction, very robust, with raised scutellum interrupting the regular convexity above, propodeal declivity very steep. Petiole broad, strongly compressed anteroposteriorly and lower than in workers, its dorsal border deeply emarginated. Gaster short and gibbous.

Male
Measurements: HL 0.63-0.65; HW 0.67-0.71; WL 1.2-1.24; SL 0.35-0.38. Indices: CI 104.69-109.52; SI 52.24-55.07 (n = 3).

Head. Head about as broad as long; eyes large and bulging beyond head outline in full-frontal view; three prominent ocelli present. Antennae 13 segmented, filiform, scapes short, failing to reach the posterior margin of head. Clypeus carinate in middle, roughly rectangular with entire anterior margin. Mandibles slender, curved strap like, the apex simple and acute without any teeth or denticles.

Mesosoma. Mesosoma enlarged to accommodate flight muscles, not constricted; pronotum small; scutum punctate, scutellum raised; declivity steep.

Petiole. Petiole broad, very low, with apex slightly emarginated.

Gaster. Gaster elongated.

Genitalia. Parameres elongated, roughly triangular, slightly bent inward at apices, covered with long setae; cuspi with short peg-like teeth and bent toward digiti; digiti straight and long, about 3 times as long as cuspi with round dorsum, covered by short peg-like teeth and bent towards each other apically; penis valve projecting.

Vestiture. Setae of varying lengths cover entire body; pubescence most abundant on gaster with terminalia especially setose.

Color. Blackish, darker than corresponding workers and queens.