Chalicodoma (Alocanthedon) aterrimum (Smith)

Engel, Michael S. & Gonzalez, Victor H., 2011, Alocanthedon, a new subgenus of Chalicodoma from Southeast Asia (Hymenoptera, Megachilidae), ZooKeys 101, pp. 51-80 : 66

Chalicodoma (Alocanthedon) aterrimum (Smith) Figs 3543

Megachile aterrima Smith 1862: 60.

Chalicodoma aterrimum (Smith); Baker 1993: 223.

Additional material.

Indonesia (Sulawesi): 1♂, 1♀, Central Sulawesi, Palolo nr. Palu, vii.1995 [July 1995] (SEMC); 1♂, Central Sulawesi, Sintuwu, SE of Palu, 1.xii.2000 [1 December 2000], I. Steffan-Dewenter (SEMC).

Diagnosisn.

Both sexes of this species are easily recognized by the largely hyaline forewings with fuscous apex and dark brown to black venation (Figs. 35, 41). The male resembles that of Chalicodoma apoicola in the presence of a dense cluster of setae forming a spot in the medial cell of the forewing (Fig. 39), the outer surface of the protibia distinctly depressed distally (as seen in profile view), and the distinct median emargination of the preapical carina of tergum VI (Fig. 40). It can be separated by the smaller body size (17-19 mm vs. 24.6 mm), the disc of clypeus largely exposed, not covered by dense, appressed setae (Fig. 36), and the shape of protarsi and setation (compare Figs. 14 and 38). As in Chalicodoma memecylonae and Chalicodoma atratiforme , the clypeal margin of the female is relatively straight, without a medioapical tubercle. In addition to the forewing color (yellow with grayish hyaline apex in those species), the female of Chalicodoma aterrimum differs from those species by the sparser and larger punctures on the basal two terga contrasting with the smaller, denser punctures of the remaining segments. In Chalicodoma memecylonae and Chalicodoma atratiforme the punctures are small and tightly packed on all terga.