PROC. ENTOMOL. SOC. WASH. 87(3). 1985, pp. 606-621 NEW MICROCADDISFLIES (TRICHOPTERA: HYDROPTILIDAE) FROM ALABAMA S. C. Harris Aquatic Biology Program, Department of Biology, University of Alabama, Tuscaloosa, Alabama 35486. Abstracl.—Ten new species of Hydroptilidae (Trichoptera) from Alabama are described and illustrated: Hydroptila circangula. If. paralatosa. H. choccolocco. H. fusina. H. cretosa. H. oakmulgeensis, H. talladega. II. paramoena. II. oneili, and Stactobiella cahaba. The Hydroptilidae, or microcaddisflies, include the smallest species of Tri-choptera, ranging in size from 2 to 6 mm. In North America, there are 14 genera with approximately 200 species. The larvae are unusual because, unlike other case-making caddisflies, the first four larval instars are free living. The genera considered in this paper build a purse case consisting of two silken valves joined at the dorsal and ventral edges and open at each end. Hydroptilid larvae occur in a variety of lotic and lentic habitats and most are thought to feed on algae, either filamentous or periphytic. Most microcaddisflies have a life cycle of one year or less. The rivers and streams of Alabama support a great diversity of microcaddisflies. In a recent paper, Harris (1985) reported a total of 79 species from Alabama, more than twice as many as neighboring states. The new species described herein, plus new records for the state, increase this total to 97 species. Terminology and species groupings follow that of Marshall (1979). Types will be deposited at the National Museum of Natural History (USNM), Illinois Natural History Survey (INHS), University of Alabama (UA), and collection of the author. Hydroptila circangula Harris, New Species Fig. 1 This species, a member of the H. consimilis group, has similarities with H. quinola Ross and H. carolae Holzenthal and Kelley. The new species can be distinguished on the appearance of the subgenital plate and structure of the phallus. Male. — Length 2.2-2.6 mm. Antennae 30-segmented. Color brown in alcohol. Venter of abdominal segment VII with short, apico-mesal process. Segment VIII quadrate in lateral view. Segment IX approximately half width of VIII and ex-tending anteriorly into that segment, with several short setae on ventral posterior margin. Segment X largely membraneous; in dorsal view, broadly cleft with di-verging apico-lateral extensions; in lateral view dome-shaped. Subgenital plate as long as inferior appendages; in ventral view evenly rounded baso-laterally, tapering to narrow, apical point bearing two divergent, subapical setae. Inferior appendages
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