Larrisson armatus 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 : 41-44

Larrisson armatus Pulawski sp. n. Figs 2 3

Name-derivation.

Armatus is a Latin masculine adjective meaning armed, with reference to the lateral spines on male tergum VII.

Recognition.

Larrisson armatus is unique in having the impunctate, medioventral area of the clypeus narrow and elongate, extending dorsally to the clypeal midlength of more. The male is also unique in having tergum I with a gap between the basolateral carina and the lateral ridge that delimits the basal concavity ( Fig. 2c ) and an anterolateral spine on tergum VII ( Fig. 2d ). Subsidiary recognition features are: orbital fovea well defined (in female about as wide as 0.8 × ocellocular distance), mesothoracic venter densely punctate throughout, gaster all red, and male sternum VIII emarginate apically, with glabrous basal platform.

Description.

Width of face across clypeus and vertex in female = 60:46-50, least interocular distance 44-45; in male 60:48, and 42, respectively. Orbital fovea well defined, in female about as wide as 0.8 × ocellocular distance, in male not quite half ocellocular distance. Clypeal lobe only slightly prominent, its free margin arcuate, slightly angulate laterally; medioventral asetose area narrow, extending to about clypeal midlength in female ( Fig. 2a ) and slightly higher in male. Scapal basin impunctate, glabrous. Length of scape (excluding radicle) 2.3 × width in female, 2.5 × in male, length equal to flagellomeres I-III combined in female, to flagellomeres I-III + half IV combined in male. Mesopleural with small tooth at top of precoxal declivity in female, with well-defined tooth in male; mesothoracic venter uniformly densely punctate and setose (punctures about one diameter apart, setae concealing integument). Metanotum without median tooth. Propodeal dorsum without spine or tubercle behind spiracle; side punctate, minutely ridged below spiracle; posterior surface unsculptured both mesodorsally and mesoventrally. Outer surface of hindtibia impunctate between spines.

Setae all silvery, appressed on head, thorax, propodeum, and legs, concealing integument on clypeus (except mesoventrally), on frons ventrolaterally, mesopleuron, and mesothoracic venter, forming apical fasciae on terga. Hindfemoral ventral and inner (= posterior) surfaces asetose (except inner surface setose preapically).

Head, thorax, and propodeum black, with the following exceptions: clypeus reddish mesoventrally, mandible reddish (dark brown apically), scape yellow (dark dorsally), flagellum brown dorsally, light brown ventrally, pronotal lobe pale yellow. Forefemur reddish anteriorly, pale yellow posteroventrally and apically, black dorsally; midfemur reddish brown anteriorly and posteriorly, yellow ventrally, narrowly black dorsally; hindfemur reddish brown, yellow apically, black dorsally; tibiae yellow dorsally, reddish brown ventrally; tarsi reddish brown. Gaster reddish brown.

Female. Forebasitarsus with four rake spines, apical spine of foretarsomere III about equal to apical basitarsal width. Pygidial plate with punctures that are about one diameter apart. Length 5.4-5.5 mm.

Male. Posterior mandibular margin slightly concave between base and notch. Dorsal length of flagellomere I 1.5 × apical width; flagellomeres I-IV convex ventrally ( Fig. 2b ). Legs unmodified except hindfemur slightly expanded posteroventrally at apex, slightly concave ventrally, not carinate between ventral and posterior (= inner) surfaces; forebasitarsus with four rake spines; apical spine of forebasitarsus III as long as apical basitarsal width. Tergum I with gap between basolateral carina and lateral ridge that delimits basal concavity ( Fig. 2c ). Tergum VII punctate throughout, rounded apically, with one basolateral spine on each side ( Fig. 2d ). Sternum II with transverse swelling, concave between swelling and posterior margin. Sternum VIII emarginate apically ( Fig. 2d ), with glabrous basal platform. Genitalia as in carinatus (see Fig. 5 ). Length 6.8 mm.

Geographic distribution

( Fig. 3 ). Known from one locality in New South Wales.

Specimens examined.

Holotype: ♀, AUSTRALIA: New South Wales: Kinchega National Park at 32°22.8'S, 142°23.6'E, 29 Dec 2009, V. Ahrens and W.J. Pulawski (AMS). Paratypes : AUSTRALIA: New South Wales: same locality and collectors, 29 Dec 2009 (1 ♀, CAS), 30 Dec 2009 (1 ♂, CAS).

Figures

Figure 2. Larrisson armatus: a female clypeus b male antenna c male tergum I in dorsolateral view (arrow indicatesbasolateral emargination) d apexof male gaster in dorsal view (upper arrow indicates basolateral tooth of tergum VII, lower arrow indicates sternum VIII).

Figure 3. Collecting locality of Larrisson armatus and tegularis.

Figure 5. Larrisson carinatus: male genitalia dorsally.