Larrisson latifrons Pulawski, 2012

Pulawski, Wojciech J., 2012, A review of the genus Larrisson Menke, 1967, and description of the new genus Larrissa (Hymenoptera, Crabronidae), Journal of Hymenoptera Research 25, pp. 35-82 : 46-48

Larrisson latifrons Pulawski sp. n. Figs 6 7

Name-derivation.

Latifrons derives from two Latin words, latus¸ broad, and frons, the forehead; a noun in apposition to the generic name.

Recognition.

The female of latifrons (the male is unknown) has an all black gaster (without red markings or yellow fasciae), and the setae appressed on the head, thorax, propodeum and legs. Larrisson niger is similar, but unlike that species the hindfemoral apex of latifrons is simple, not broadened ( Fig. 7b ), the scutum and mesopleuron are dull, with interspaces between punctures linear, and the setae of the pygidial plate do not conceal the integument.

Description.

Female. Width of face across clypeus and vertex = 60:57, least interocular distance 40 or 46. Orbital fovea ill defined, about as wide as half ocellocular distance. Clypeal lobe only slightly prominent ( Fig. 7a ), its free margin arcuate, slightly angulate laterally. Scapal basin sparsely punctate (punctures several diameters apart). Length of scape (excluding radicle) 2.6 × width, length equal to flagellomeres I-V combined. Scutal punctures less than one diameter apart. Mesopleuron with ill-defined transverse crest in front of midcoxa; mesothoracic venter densely punctate throughout (punctures less than one diameter apart). Metanotum with low, obtuse median tubercle. Propodeum without spine or tubercle behind spiracle; side conspicuously ridged; posterior surface ridged both mesodorsally and mesoventrally. Outer surface of hindtibia impunctate and asetose between spines (except basally and ventrally). Tergum I concave basally.

Setae all silvery, appressed on head, thorax, propodeum, and legs, nearly completely concealing integument on clypeus and frons (on scapal basin markedly shorter than on remaining frons, not concealing integument), not so on mesopleuron, me sothoracic venter, and pygidial plate. Hindfemoral venter setose only basally, inner (= posterior) surface of hindfemur setose ( Fig. 7b ).

Head, thorax, propodeum, and gaster black except scape, mandible basally (black apically), and pronotal lobe pale yellow; flagellum black dorsally, brown ventrally. Femora black, pale yellow apically, tibiae and tarsi pale yellow, apical tarsomeres yellowish brown.

Forebasitarsus with four rake spines, apical spine of foretarsomere III about equal to apical basitarsal width. Pygidial plate with punctures that are more than one diameter basally, less than one diameter apart apically. Length 4.8-6.1 mm.

Male. Unknown.

Geographic distribution

( Fig. 6 ). Known from one locality in northern Queensland.

Specimens examined.

Holotype: ♀, AUSTRALIA: Queensland: Hann River at 15°11'S, 143°52'E, 26 June 1993, I.D. Naumann and P. Zborowski (ANIC). Paratype: same locality, 20 Oct - 17 Nov 1993, P. Zborowski and M. Horak (1 ♀, CAS).

Figures

Figure 6. Collecting localities of Larrisson carinatus, latifrons, niger, and orbitalis.

Figure 7. Larrisson latifrons ♀: a head in frontal view b hindfemur and base of hindtibia in lateral view.