PROC. ENT. SOC. AVASH., VOL. 50, NO. 6, JUNE, 19-±8 151 NEW SPECIES OF SERICOSTOMATOID TRICHOPTERA By Herbert H. Koss, Illinois Natural History Survey, Vrhana. Illinois The four species described in this paper come from moun-tainous regions of the continent, two from the East and two from the West, and each is known from onl.v one locality or from localities within a small area. All four species share also the circumstance that each is remarkably well set otf from its closest known relative. The discovery of these and others like them suggests strongly that there exist in the nearctic fauna many unknown species of eaddisflies, either extremely local in distribution or making their adult appearance over only a short emergence period. I am greatly indebted to P. W. Fattig, Kenneth W. Fender, and Mike Wright for sending this material to me. Types are deposited in the collection of the Illinois Natural History Survey. Lepidostomatidae Lepidostoma veroda, new species This species is a member of the Unicolor Group, and in my 1946 key will resolve through couplet 34 to delongi Ross, known only from Mexico. These two species, veroda and delongi, may be separated by the following couplet. Ventral aspect of clasper having tip of outer apical lobe ending in a sharp point that lies lateaad of inner apical lobe; lateral as-pect of tenth tergite without a blunt projection on posterior margin, but with a large rounded lobe on ventral margin (Eoss, 1946, p. 277, fig. 12) delongi Ventral aspect of clasper having tip of outer apical lobe finger-like and curved slightly mesad, overlaying tip of inner apical lobe which is of the same shape; lateral aspect of tenth tergite with a blunt triangular projection on posterior margin, but with nearly straight ventral margin, fig. 1, veroda Male. Length from front of head to tip of wings, 8 mm. Color of head and body dark brown, antennae and legs yellow, wings tawny and light. Antenna highly modified; scape large and swollen, bilaterally com-pressed, laterally smooth and forming an expanse larger than lateral area of the head, slightly longer than deep, and mesally excavated to form an earlike organ bearing scattered black hairs; pedicel moderately robust; flagellum narrow and whiplike, normal in shape. Maxillary palpus forming a large, elongate, oval mass, the apical portion set off to form a thin membranous hood, the whole forming a pocket filled with abundant long scales. Wings normal for genus; front wing with-out refiexed anterior margin or scale pockets; hind wing also lacking special structures but having a row of black scales along base of Cu^ and the central portion of M and base of M^+o and Mg. Legs normal
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