Hylaeus (Deranchylaeus) xanthostoma (Alfken, 1914)

Dathe, Holger H., 2023, New insights into the taxonomy of the Hylaeus xanthostoma complex and further additions to the African Hylaeus fauna (Hymenoptera, Anthophila, Colletidae), Contributions to Entomology 73 (1), pp. 67-93 : 67

Hylaeus (Deranchylaeus) xanthostoma (Alfken, 1914)

Prosopis xanthostoma Alfken, 1914: 196-197. ♀♂, Belgisch Kongo [DR Congo]. Lectotype ♀, ZMB Berlin.

Hylaeus (Deranchylaeus) xanthostoma (Alfken): Bridwell (1919: 138-139); Dathe (2014: 74).

Remarks.

It took exactly 100 years to study this not uncommon species in detail ( Dathe 2014). The supposed special female character, the orange clypeus, is actually not unique at all. The real H. xanthostoma belongs to the of Hylaeus curvicarinatus species group, subgroup 2 ( Dathe 2014: 11); it is, as it were, the “benchmark” for the classification of the species listed here. The most important characters of the male are shown in Fig. 2 (face), 11 (mesosoma), 20 (metasoma) and 29, 45 (terminalia); those of the female in Fig. 47 (face), 53 (mesosoma) and 59 (metasoma).

Figures

Figures 1 - 9. Hylaeus (Deranchylaeus) species, males. Head, frontal view. 1. H. (D.) aurantiacus sp. nov.; 2. H. (D.) xanthostoma (Alfken); 3. H. (D.) burundis sp. nov.; 4. H. (D.) promontorii (M. - W.); 5. H. (D.) lyriformis sp. nov.; 6. H. (D.) sambiensis sp. nov.; 7. H. (D.) portokalius sp. nov.; 8. H. (D.) venustus Dathe; 9. H. (D.) diastictus sp. nov. Scale bar 0.5 mm.

Figures 46 - 51. Hylaeus (Deranchylaeus) species, females. Head, frontal view. 46. H. (D.) aurantiacus sp. nov.; 47. H. (D.) xanthostoma (Alfken); 48. H. (D.) promontorii (M. - W.); 49. H. (D.) portokalius sp. nov.; 50. H. (D.) venustus Dathe; 51. H. (D.) jemeniticus sp. nov. Scale bar 0.5 mm.