Figure 3 in Comparative morphology of the skeletal parts of the sting apparatus of bees (Hymenoptera: Apoidea)

Figure 3. Variation in structure of 7th hemitergites of crabronid wasps and bees of the family Colletidae, views of morphologically dorsal surface with anterior to the left. In this figure and Figs 4 and 5, the tubular structure arising from the spiracular opening is the trachea of the 7th gastral segment. Scale bar = 0.25 mm. (A) Tachytes. (B) Pemphredon, hemitergites of both sides showing incomplete sclerotized bridge between them. (C) Euryglossa. (D) Hylaeus. (E) Chilicola. (F) Crawfordapis.