Larrisson carinatus 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 : 44-46

Larrisson carinatus Pulawski sp. n. Figs 4 -6

Name-derivation.

Carinatus is a Latin masculine adjective derived from carina, with reference to the longitudinal carina on male sternum II.

Recognition.

The male of carinatus is unique in having a sharply pointed apically median carina in the basal half of sternum II ( Fig. 4c ). It can also be recognized by the combination of a largely red gaster, metanotum without a spine or tubercle, propodeum without a spine or tubercle behind the spiracle, presence of a spine in front of the midcoxa, and concave ventral surface of sternum VIII. The female is unknown.

Description.

Male. Width of face across clypeus and vertex = 60:52, least interocular distance 40. Orbital fovea well defined, about half as wide as ocellocular distance. Clypeal lobe only slightly prominent, its free margin arcuate, not angulate laterally ( Fig. 4a ). Length of scape (excluding radicle) 2.8 × width, length equal to flagellomeres I-IV + half V combined. Flagellomeres cylindrical. Mesopleuron with prominent spine in front of midcoxa ( Fig. 4b ); mesothoracic venter sparsely punctate on each side of median zone (punctures several diameters apart). Metanotum uniformly rounded mesally, without spine or tubercle. Propodeal side ridged; posterior surface ridged mesodorsally, unsculptured mesoventrally. Outer surface of hindtibia impunctate and asetose between spines. Tergum I conspicuously concave basally.

Setae all silvery, appressed on head, thorax, propodeum, and legs, nearly completely concealing integument on clypeus (except glabrous ventral portion of median lobe) and frons (except for glabrous scapal basin), not concealing integument on mesopleuron or mesothoracic venter, forming apical fasciae on terga I-IV. Hindfemoral venter and inner (= posterior) surface asetose.

Head, thorax, and propodeum black except the following are pale yellow: scape, pedicel, mandible (except apically), and pronotal lobe, whereas glabrous portion of clypeal lobe brown, and flagellum yellowish brown (darkened dorsally on at least basal half). Forefemur reddish brown dorsally, yellow ventrally and apically; midfemur reddish brown except yellow apically and ventrally in distal half; hindfemur reddish brown except yellow apically; foretibia yellow on outer side, reddish brown on inner side; mid- and hindtibiae varying from mostly pale yellow to mostly reddish brown; foretarsus reddish brown; mid- and hindtarsi pale yellow except apical tarsomere dark brown. Gaster reddish brown except terga III-VI or IV-V with black basal spots that may be interrupted mesally.

Posterior mandibular margin not expanded between base and notch, inner margin without tooth near midlength ( Fig. 4a ). Flagellum cylindrical; dorsal length of flagellomere I 1.1 × apical width. Propodeum without spine behind spiracle. Legs unmodified except hindfemur slightly expanded posteroventrally at apex, not concave ventrally and not carinate between ventral and posterior (= inner) surfaces; forebasitarsus with five rake spines; apical spine of forebasitarsus III 1.1 × as long as apical basitarsal width. Tergum VII punctate throughout, rounded apically ( Fig. 4d ). Sternum II elevated in basal half, concave in distal half, with obtuse median carina in basal half ( Fig. 4c ), carina pointed apically and projecting over concave portion. Sterna with long, erect setae at bases of apical depressions, sterna VI and VII also with numerous erect setae that are about one midocellar width long. Sternum VIII largely concave, glabrous, rounded apically. Genitalia: Fig. 5 . Length 7.5-9.1 mm.

Female. Unknown.

Geographic distribution

( Fig. 6 ). Known from two adjacent localities near the western coast of Australia.

Specimens examined.

Holotype: ♂, AUSTRALIA: Western Australia: 54 km NE Kalbarri at 27°15'20"S, 114°31'13"E, 5 Oct 1997, T.F. Houston (WAMP). Paratypes: AUSTRALIA: Western Australia: same data as holotype (1 ♂, CAS); 9 km NNE Eurardy Homestead on North West Coastal Highway at 27°30'S, 114°43'E, 25-28 Oct 1996, T.F. Houston (1 ♂ , ANIC).

Figures

Figure 4. Larrisson carinatus ♂: a clypeus and mandible b ventral portion of mesopleuron (arrow indicates precoxal spine) c sternum II in lateral view d tergum VII (arrow indicates sternum VIII).

Figure 5. Larrisson carinatus: male genitalia dorsally.

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