The new species Antaeotricha utahensis is described from San Juan Co., Utah and Catron, Grant and Santa Fe counties, New Mexico. Adults and genitalia are illustrated.
For the past several seasons in the Southwest, I have collected specimens of a middle-sized unmarked creamy-white Antaeotricha species. I now have a small series of this moth and my recent examination of the genitalia failed to produce a match with any species in the literature. There are smaller sized pale species known from the eastern United States, but the genitalia in both sexes are very different from what I have collected. In 1964, Duckworth reviewed the North American Stenomatinae and described two new species of Antaeotricha, expanding the North American species total to fifteen. I subsequently have described the maculated gray Antaeotricha arizonensis (Ferris, 2010). The genus Antaeotricha is most easily recognized by the anatomy of the male genitalia. The lightly sclerotized valves are narrow tapering to a rounded tip. The prominent harpe has a thumblike costal projection bearing long, bifurcate, recurved setae (Figs. 2–3).
Materials and methods. Nine specimens of the new species were collected in bucket traps of the author's design using 8 watt BL fluorescent tubes operated from electronic power converters connected to 12 volt motorcycle batteries. Two additional specimens found by John W. Brown in the National Museum of Natural History collection were borrowed for examination. Genitalia dissection was carried out after macerating the abdomens in hot 10% KOH for fifteen minutes. Temporary slides were prepared using glycerin as the suspension medium. The genitalia are stored in glycerin in polyethylene genitalia vials attached to the specimen pins.
Ferris, new species
Diagnosis. The essentially unmarked glossy creamy dorsal surface of the forewings of Antaeotricha utahensis separate it from its congeners. It superficially resembles a very pale form of A. thomasi (Barnes and Busck), but in the male genitalia the uncus is distally broadly spatulate with a pointed tip, whereas in A. thomasi it is distally narrow with a notched apex. In the female genitalia, the signum is different in shape (a modified six-pointed star in A. utahensis versus a cross in A. thomasi). The male genitalia of A. arizonensis Ferris and A. fuscorectangulata Duckworth have an uncus shape similar to A. utahensis, but adults of both species have heavily maculated dorsal forewings.
Description. Imago: Sexes similar except antenna and genitalia. Except as noted for eye, tarsi and wings, remaining body components are glossy creamy white. [The gloss/sheen presented digital photography problems. In Fig. 1 the dark areas of the hindwing are a photographic artifact.] Head: Antenna (shaft and scape) glossy creamy white; ciliated ventrally in male, cilia slightly longer than width of fiagellomere with curved tips; simple in female. Eye mottled black. Haustellum present. Labial palpus upcurved extending well above crown of head. Tarsi: Blend from creamy white to very pale tan toward tips; claws brown. Wings: Forewing length: males (n = 9) 9–11 mm, ave. = 10.2 mm; females (n = 2) both 9.5 mm. Dorsal forewing, elongate with rounded distal margin. Ground color glossy silky creamy white, very sparsely overlaid with very small single brown scales (visible only with magnification); a few single brown scales along base of fringe only; fringe scales otherwise glossy creamy white. Ventral forewing covered with many brown scales producing a dark tan color. Dorsal hindwing glossy, with sightly warmer creamy color and without any small brown scales. Ventral hindwing similar to dorsal but less glossy. Male genitalia (Figs. 2–5; 4 dissections): Uncus decurved, spatulate, narrow basally with a sharp apical point. Gnathos upcurved at midpoint with distal portion tapering to a rounded tip. Vinculum complete, arching in front. Anellus without distinct lobes. Valva elongate, expanded in middle, then tapering to broadly rounded tip; harpe thumblike bearing many long recurved bifurcate setae. Aedeagus short and broad (length about 2.5 times diameter) with multiple cornuti and irregular anterior margin; exposed vesica with 2 to 4 apparently deciduous robust spines and additional broad-based semi-fused robust curved spines and a setose brush (arrows in Figs. 4–5). Female genitalia (Figs. 6–7; 1 dissection): Ovipositor lobe basally broad and straight with rounded apex, sparsely covered with short fine hairs. Posterior apophyses well developed; anterior apophyses vestigial. Sterigma broad and open. Ductus bursae at top partially heavily sclerotized with lengthwise slender triangular plate, short and broad (only sightly longer than diameter) opening into tear-shaped corpus bursae, the top of which bulges slightly above junction with ductus bursae. Signum a large stylized six-pointed star with central outwardly projecting oblong plate perpendicular to base; plate is nearly rectangular with rounded edges and corners. Ductus seminalis originates from upper quadrant of corpus bursae.
Discussion. Based upon the male genitalia, Antaeotricha Utahensis is closest to A. fuscorectangulata (adult forewings heavily maculated), but the tegumen is not produced into a dorsally projecting process in front: the aedeagus is shorter and broader with a different complement of cornuti. The female genitalia are closest to A. thomasi, but the signum in A. thomasi is a cross with a projecting element. In A. thomasi, the ductus seminalis originates from the midpoint of the ductus bursae, while it originates from the upper quadrant of the corpus bursae in A. Utahensis.
Types. Holotype male (Fig. 1): UTAH, San Juan Co., 37°44.90′N, 109°24.75′W, 7280′ (2220m), 30 July, 2011. Deposited in Carnegie Museum, Pittsburgh, PA. Paratypes: 4m (2 dissected), If (dissected), same data as holotype: NEW MEXICO, Catron Co., 33°39.97′N, 108°52.74′W, 6290′ (1918m), 5.Vii.07, lm (dissected); Grant Co., 32°64.86′N, 108° 13.44′W, 6820′ (2080m), 19.vii.07, lm (dissected), 33°03.70′N, 108° 12.68′W, 6200′ (1890 m), l.viii.ll, lm. Paratypes in author's collection. Two additional paratypes in National Museum of Natural History, Washington DC: NEW MEXICO, Grant Co., Pinos Altos Mts., 6500′ (1980m), nr. Silver City, 14.viii.87, R. Leuschner, If; Santa Fe Co., Tesuque, 26.vii.89, R. Leuschner, lm.
Biology. Unknown; adults from early July to early August. The type locality (Fig. 9) and the three sites in southwestern New Mexico are moderately dry oak-conifer forest.
Distribution. Known from southeastern Utah and New Mexico (Fig. 8).
Etymology. The name utahensis (adjective) denotes the geographic locality where the holotype was collected.
My thanks to John W. Brown, Smithsonian Institution, National Museum of Natural History, Washington, DC for the loan of specimens for examination. Two anonymous reviewers provided helpful comments that clarified the content of this manuscript.