Exomalopsis, Spinola, 1853

Rozen, Jerome G., 2011, Immatures of Exomalopsine Bees with Notes on Nesting Biology and a Tribal Key to Mature Larvae of Noncorbiculate, Nonparasitic Apinae (Hymenoptera: Apidae), American Museum Novitates 2011 (3726), pp. 1-52 : 19

EXOMALOPSIS (STILBOMALOPSIS) SOLIDAGINIS COCKERELL

Figures 5 –12, 24–26, 36

This description is based on only predefecating last larval instars.

DIAGNOSIS: Similar to that of Exomalopsis auropilosa , the mandibular apex of this species ends in two broad apical teeth, each with scalloped edges (fig. 36). Salivary opening is transverse, short (width about one-half distance between labial palpi), and without projecting lips. Hypopharynx is a pair of spiculate lobes well behind apices of articulating arms of stipes. The moderately long spiracular subatrium consists of about 12 chambers. Sex characters are unknown. As in Exomalopsis solani , the spicules lateral to and above the anus are smaller than those found in Exomalopsis s.s.

MATERIAL STUDIED: Numerous (10+) predefecating larvae: New Mexico: Hidalgo Co., 20 mi S Animas, IX-14-1977 (J.G., B.L. Rozen) .

REMARKS: Rozen (1984) described the nesting biology of Exomalopsis solidaginis from several nests excavated in southern Arizona and New Mexico including the one from which this material was taken.

Figures

FIGURES 5–9. Mature larva of Exomalopsis solidaginis. 5–7. Microphotographs of cleared right mandible, dorsal, inner, and ventral views, respectively. 8. Microphotograph close-up of cusp taken from direction of arrow in figure 5. 9. Same except of different specimen taken with confocal microscope. FIGURES 10, 11. SEM micrographs of right mandible of same, showing apex and cusp. 10. Mostly ventral view. 11. Mostly dorsal view. FIGURE 12. Microphotograph of epipharyngeal area of cleared labrum showing direction of spiculation on paired swellings.