Trirogma caerulea Westwood, 1841

Gadallah, Neveen S., 2017, Revision of the digger wasps of the Ampulicidae and Heterogynaidae (Hymenoptera) of Saudi Arabia, with the description of a new species of the enigmatic genus Heterogyna Nagy, Journal of Natural History 51 (33 - 34), pp. 2057-2085 : 2066-2070

Trirogma caerulea Westwood, 1841

( Figures 5 (a–d), 6(a–d))

Trirogma caerulea Westwood, 1841: 152 , ♂. Holotype or syntypes ‘neither the depository, nor whether the type is unique or not, are apparent from the very concise original description’: ♂, northern India: no specific locality (depository?).

Diagnosis

Male 12 mm long, female 12–15 mm long; antennal tubercles overhung as a single broad frontal lobe ( Figures 5 (b), 6(b)); entirely metallic-blue in colour ( Figures 5 (a), 6(a)); episternal sulcus crenulate forward; metasoma shortly petiolate ( Figures 5 (a), 6(a)); occipital carina not extending onto venter of head or slightly so; pronotum with a pair of large pointed tubercles ( Figures 5 (c), 6(c)); male with an additional pair of smaller tubercles on mesoscutum and a strong central tubercle on scutellum ( Figure 5 (c)); frons sparsely punctate in female, with scattered smaller punctures in between; thickened side of frontal lobe deeply sulcate; S2 with bi-sinuate groove on basal third, terminating with tubercle ( Figure 6 (d)).

Material examined: Saudi Arabia

1 ♂, Riyadh, Al-Hamra, SW, 5 January 2015 (leg. Y. Al Dryhim) [ KSMA]; 1 ♀, Riyadh, Al- Hamra, SW, 26 September 2016 (leg. Y. Al Dryhim) [ KSMA]; 1 ♀, Riyadh, Umm Salim, Al Emam Faisal Ibn Turki street (indoors), hand collected, 17 July 2016 (leg. Ahmed M. Soliman) [ KSMA]; 1 ♀, Riyadh, Al-Yasmin, King Salman Road, SW, 23 December 2013 (leg. M. Al Sufayan) [ KSMA]; 1 ♀, Riyadh, Al-Aqeeq, SW, 18 April 2015 (leg.?) [ EFC] .

Distribution

Widespread in the Oriental region, as far west as Iraq ( Abdul Rassoul 1976; Krombein 1979; Job and Olakkengil 2014); China ( Hua 2006), Iran ( Ebrahimi 2008, 2014), UAE (Sharja) ( Ohl 2011), Saudi Arabia (new record).

Family HETEROGYNAIDAE Genus Heterogyna Nagy, 1969

Heterogyna Nagy, 1969: 300 . Type species: Heterogyna protea Nagy, 1969 .

Daycatinca Argaman, 1985: 7 . Type species: Heterogyna fantsilotra Day, 1984 .

Daya Antropov and Gorbatovskiy, 1992: 58 (as a subgenus of Heterogyna ). Type species: Heterogyna madecassa Day, 1984 .

Key to the species of the genus Heterogyna in the Arabian Peninsula

1. Fully winged, fore wing more or less reaching metasomal apex ( Figures 10 (a), 13(a), 14(a)); pronotal collar distinctly wider than long ( Figures 10 (a), 13(d)); antenna 13- segmented ............................................................................................................................. (males) 2

– Brachypterous, fore wing hardly reaching metasomal base ( Figures 7 (a), 12(b)); pronotum as long as, or longer than, wide ( Figures 7 (a), 12(a,e)); antenna 12- segmented ......................................................................................................................... (females) 3

2. Body almost entirely black, with legs partly yellow ( Figure 10 (a)); head sparsely punctate, alutaceous between punctures ( Figure 10 (b,c)); wing veins mostly unpigmented ( Figure 11 (b)); fore wing with subrounded marginal cell ( Figure 11 (b)), 1.2 × as long as wide; 1M cell delimited distally with extremely faint vein (1m-cu) ( Figure 11 (b)); pronotal disc flattened, somewhat tightly articulating posterad with mesoscutum ( Figure 10 (a)); posterior margin of S8 broadly and deeply emarginated; genitalia as in Figure 11 (d–f) ...................................................................... H. saudita sp. nov.

– Body bright yellow on different parts, mainly mesosoma, legs and parts of antenna, head and metasoma pale to dark brown ( Figure 13 (a)); head sparsely punctate, integument smooth and shiny between punctures ( Figure 13 (b)); wing veins well pigmented; marginal cell of fore wing distinctly elongated, at least 2× as long as wide ( Figure 13 (e)); 1M cell delimited distally with well-pigmented vein (1m-cu) ( Figure 13 (e)); pronotal disc angled, loosely articulating posterad with mesoscutum ( Figure 13 (c)); posterior margin of S8 trilobate; genitalia as in Figure 13 (f,g) ...................................................................................................... H. nocticola Ohl

3. Head, mesosoma and legs red-brown (head with black tint), metasoma black ( Figure 7 (a–c)); antenna with scape, pedicel and F1–2 (except tip of F2) bright yellow, rest of flagellum dark brown to black ( Figure 7 (d,e)); head sparsely punctate, alutaceous to shagreened between punctures ( Figure 7 (b)); pronotum laterally with 6–7 distinct longitudinal carinae ( Figure 8 (b)); mesoscutum with seven transverse well-defined carinae; fore wing densely setose, infuscate medially ( Figure 8 (d)); hind wing sharply pointed apically ( Figure 8 (d)) .......................................... H. saudita sp. nov.

– Head, mesosoma and legs bright yellow, metasoma pale brown ( Figure 12 (a,b)), antenna entirely yellow ( Figure 12 (c)); head sparsely punctate, integument smooth and shiny between punctures; pronotum laterally without longitudinal carinae; mesoscutum at most with hardly indicated three transverse carinae; fore wing hyaline, sparsely setose; hind wing rounded apically ............. ............. H. nocticola Ohl

Figures

Figure 5. (a–d) Trirogma caerulea Westwood (male). (a) Habitus, dorsal view; (b) head, frontal view (frontal lobe indicated); (c) head and mesosoma, dorso-lateral view (frontal lobe and mesoscutal and scutellar tubercles indicated); (d) fore- and hind wings.

Figure 6. (a–d) Trirogma caerulea Westwood (female). (a) Habitus, dorsal view; (b) head, frontal view (frontal lobe indicated); (c) mesosoma, dorso-lateral view (pronotal tubercles indicated); (d) S2 (bisinuate groove indicated).

Figure 7. (a–e) Heterogyna saudita sp. nov. (female, holotype). (a) Habitus, dorso-lateral view; (b) head, frontal view (mandibular teeth indicated); (c) head, lateral view; (d) antennae (oval-shaped black spot on F2 indicated); (e) F2–F4 (oval-shaped black spot on F2 indicated).

Figure 8. (a–d) Heterogyna saudita sp. nov. (female, holotype). (a) Head, frontal view; (b) mesosoma, dorso-lateral view (longitudinal lateral carinae on pronotum, transverse carinae on mesoscutum, median tubercle on hind margin of dorsal propodeal face and 2ph–3ph indicated); (c) mesoscutum (transverse carinae indicated); (d) fore- and hind wings (basal portion of fore wing enlarged).

Figure 10. (a–d) Heterogyna saudita sp. nov. (male, paratype). (a) Habitus, lateral view (posterodorsal edge of pronotum indicated); (b) head, dorso-frontal view; (c) head, dorsal view; (d) mesosoma, dorsal view (parapsidal line and posterior carinae on mesoscutum and longitudinal median depression on propodeum indicated).

Figure 11. (a–f) Heterogyna saudita sp. nov. (male, paratype). (a) Metasomal terga; (b) fore wing and hind wing (part; marginal cell enlarged); (c) S6–8 (spindle-shaped swelling on S7 and double-edged elevation on S8); (d,e,f) Genitalia: ventral, dorsal and lateral aspects, respectively.

Figure 12. (a–f) Heterogyna nocticola Ohl (female, paratype). (a) Habitus, dorso-lateral view; (b) habitus, ventral view; (c) head (lateral view) and antennae; (d) head, fronto-lateral view; (e) mesosoma, dorso-lateral view; (f) paratype specimen label.

Figure 13. (a–h) Heterogyna nocticola Ohl (male, paratype). (a) Habitus, lateral view; (b) head, frontal view; (c) head, pronotum and mesoscutum (part), lateral view (pronotal postero-dorsal edge indicated); (d) mesosoma, dorsal view; (e) fore wing and hind wing (part; marginal cell indicated); (f) S6–8 (posterior edge of S8 indicated); (g) genitalia (partly extracted), dorsal aspect (aedeagus indicated); (h) paratype specimen label.