Felisacus crassicornis Usinger, 1946

Namyatova, Anna A. & Cassis, Gerasimos, 2016, Revision And Phylogeny Of The Fern-Inhabiting Genus Felisacus Distant (Insecta: Heteroptera: Miridae: Bryocorinae) Anna A. Namyatova And Gerasimos Cassis, Bulletin of the American Museum of Natural History 2016 (403), pp. 1-169 : 67-68

Felisacus crassicornis Usinger, 1946

Figures 4 , 17

Felisacus crassicornis Usinger, 1946: 70 (original

description).

DIAGNOSIS: Recognized by the following combination of characters: pronotum mostly brown with yellow medial longitudinal stripe; marking along inner margin of corium pale brown to brown, short and narrow, not extending toward R+M (fig. 4), antennal segment I mostly yellow, dark brown apically; antennal segment I widened (as in Namyatova and Cassis, in press: fig. 8B); dorsal surface of labial segment II not elongate posteriorly (as in Namyatova et al., 2016: fig. 6E); labial segment III shorter than ventral side of head; labium slightly surpassing middle of mesosternum; occipital region present only dorsally; distinctly protruding eye; hemelytron with distinct punctures; right and left parameres sickle shaped ( Carvalho, 1956: fig. 17h, I).

REDESCRIPTION: Male. No specimens were examined. See Usinger (1946) and Carvalho (1956) for description of male.

Female. Total length 3.3–3.5. COLORATION (fig. 4): Head: Whitish yellow to pale brown, buccula anteriorly, clypeus apically and tubercle around antennal fossa often pale brown. Eye brown, sometimes with reddish tinge. Labium: Uniformly yellow. Antenna: Segment I yellow dark brown apically and often pale to brown basally; segment II yellow basally and pale brown apically; segments III–IV brown to dark brown, rarely segment III basally or entire segment IV pale brown. Thorax: Anterior part of pronotum yellow to pale brown, often with anterior margin pale brown; punctures between anterior and posterior parts pale brown; posterior part of pronotum pale brown to brown with yellow or pale brown stripe medially; scutellum and mesoscutum whitish yellow to yellow with punctures between them pale brown; thoracic pleura whitish yellow to yellow; scent gland evaporative area whitish yellow to yellow. Hemelytron: Clavus opaque, its inner part yellow to brown, outer part yellow to pale brown; corium whitish, translucent, areas around punctures opaque; area along inner margin of corium pale brown to brown narrow and short, not extending toward R+M; embolium whitish yellow to yellow, translucent to opaque, with yellow margins; cuneus translucent, colorless with outer margin yellow; membrane translucent, colorless with pale brown or grayish tinge; membrane cell pale brown. Legs: Yellow, bases of coxae and femora often whitish yellow; tibia sometimes pale brown apically, tarsal segments I and II often pale brown. Abdomen: Yellow with pale brown dorsal surface. SUR- FACE AND VESTITURE: Corium often with distinct punctures. Dorsum and femora anteriorly clothed with suberect setae mostly longer than antennal segment II diameter; setae on dor- sum scarce; antennal segment I with rare suberect setae shorter than antennal segment II diameter; abdomen clothed with suberect mostly short simple setae. STRUCTURE AND MEA-

SUREMENTS: Body ca. 3.6–3.9× as long as pronotum width. Head: Depression delimiting occipital region present only dorsally; distance between depression and pronotum distinctly longer than eye diameter; longitudinal sulcus on dorsal surface shorter than eye diameter; distance from eye to pronotum slightly longer than eye diameter, not swollen; vertex ca. 2.1–2.5× as wide as eye diameter; upraised; buccula ca. 0.2– 0.25× as long as clypeus. Labium: Reaching posterior margins of mesosternum but not surpassing it; segments I and II reduced, combined slightly longer than half of antennal segment III; segment I shorter than wide; segment II slightly longer than wide, subequal to half of segment III, its dorsal surface not elongate posteriorly (as in Namyatova et al., 2016: fig. 8B); segment III shorter than length of ventral side of head; segment IV subequal to half of segment III. Antenna: Segment I only slightly longer than head width, widened (as in Namyatova et al., 2016: fig. 8B), ca. 0.9–1.1× as long as head width, ca. 0.6–0.7× as long as pronotum width; segment II ca. 1.2–1.5× as long as head width, ca. 0.8– 1.0× as long as pronotum width; segment III distinctly longer than segment II; segment IV ca. 0.4–0.5× as long as segment III. Thorax: Anterior part of pronotum shorter than posterior part; collar distinct; posterior part of pronotum slightly upraised; posterior margin of pronotum straight or concave; pronotum ca. 1.3–1.4× as wide as long and ca. 1.5–1.6× as wide as head; mesoscutum usually exposed, sometimes not exposed. Hemelytron: Area along inner margin of corium swollen; inner margin of cuneus straight, outer margin of cuneus twice as long as base. Female genitalia were not examined.

DISTRIBUTION: Mariana Is. (fig. 17).

HOST PLANTS: Ferns ( Usinger, 1946).

DISCUSSION: Usinger (1946) described F. crassicornis from two females, housed in the BPBM. Carvalho (1956) also examined males and females in his redescription of the species. We had only females available for this study. Felisacus crassicornis can be confused with F. auritulus externally (fig. 4); the latter species differs by the antennal segment I dark brown with a yellow base, the dorsal surface of labial segment II elongate posteriorly, covering antennal segment II, and the punctures on the hemelytra absent or indistinct. The parameres of F. crassicornis are most similar to those of F. ponaponensis (cf. Carvalho, 1956: fig. 17h with fig. 13I, J). These two species are also similar in having a pale body, without any dark stripes or markings on the hemelytra. However, F. ponaponensis differs in the collar not being delimited posteriorly, and the pronotum covering the head to the depression delimiting the occipital region. We have no information on the structure of the aedeagus of F. crassicornis .

MATERIAL EXAMINED: Holotype: GUAM: Machanao , 25 Nov 1936, O.H. Swezey, 1♀ ( BPBM _ TCN 00002954 ) ( BPBM). Paratypes: GUAM: Machanao , 05 Jun 1936, R.L. Usinger, 1♀ ( BPBM _ TCN 00002955 ) ( BPBM). Additional material: GUAM: Mariana Is.: Guam, Mt. Lamlam , Dec 1958, N.L.H. Krauss, 1♀ (00043260) ( BPBM). Upi Trail, 05 May 1936, O.H. Swezey, 1♀ (00043252) ( BPBM). Yigo, 13.53194 ° N 144.88027 ° E, 126 m, Oct 1957, N.L.H. Krauss, 6♀ (00043253–00043258) ( BPBM) ; Feb 1958, N.L.H. Krauss, 1♀ (00043259) ( BPBM) .

Figures

FIGURE 4. Habitus of Felisacus species.

FIGURE 17. Distribution of Felisacus species.