Neotrichia falca Ross

Harris, Steven C. & Rasmussen, Andrew K., 2010, The Neotrichia caxima Group (Trichoptera: Hydroptilidae) in the southeastern United States, Zootaxa 2608, pp. 25-44 : 28

Neotrichia falca Ross

( Figs 3 , 4 )

Ross (1938): 119, 3; Ross (1944): 159, Ƥ

Neotrichia falca was originally described from Illinois by Ross (1938) and subsequently reported from Kansas, Ohio, South Carolina, and Wisconsin (Keth 2002). The male is separated on the basis of the apically divided inferior appendage ( Fig. 3 A) and the deeply divided 10th tergite. The female of N. falca was described by Ross (1938), but is redescribed below in the context of the other southeastern species of the group.

Redescription of female. Length 2–2.5mm. 18 antennal segments. Brown in alcohol. Abdominal segments VII-X typical for the genus, sternum segment VIII with mesal sclerite as in Fig. 4 A, with thin, lateral processes narrowing apically. Bursa copulatrix as in Fig. 4 B with posterior copulatory channel about same length as anterior genital chamber, this chamber sclerotized marginally, extending anteriorly as elongate processes, with bell-shaped central sclerite.

On the basis of the narrow, curved sternal sclerite on abdominal segment VIII, N. falca is grouped with N. riegeli and N. alabamensis . It differs in the linear nature of the sternal sclerite in comparison to the other two species.

Material examined. Illinois, Kankakee County, Momence, Kankakee River, 22 June1938, Ross/Burks, 873, 16Ƥ.

Distribution. IL, KS, MN, OH, SC, WI.

Figures

FIGURE 3. Neotrichia falca, male genitalia. A. Left lateral view, B. Ventral view, C. Dorsal view, D. Phallus, left lateral view.

FIGURE 4. Neotrichia falca, female genitalia. A. Abdominal segment VIII, ventral view, B. Bursa copulatrix, ventral view.