Anthrax laticellus Marston 1970

Anthrax laticellus

MALE.—Body black, femora and tibiae red; integument blue gray and brown pruinose. Front with black setae and linear white scales; face with black setae extending almost to antennae. Occiput with black setae and scales on upper three-fifths, with some white scales below; fringe of hairs on posterior margin black exteriorly, white interiorly on upper two-thirds, white below. First antennal segment shorter than apical width; second segment lenticular; base of third segment flattened mesolaterally, about as wide as second segment in lateral view, narrowing abruptly to styliform part which is slightly longer than base and about 1.5 times longer than style (Figure 120).

Discs and lateral margins of mesonotum and scutellum with linear black scales, a few white scales in front of base of wing. Sternopleuron, lower half of mesopleuron, and anterior half of pteropleuron with white setae, and few black setae present, especially on pteropleuron. Prosternum, propleuron, upper half of mesopleuron, and anterior margin of mesonotum with white pile, some white setae on mesopleuron and numerous black setae on anterior margin of mesonotum. Postalar tuft of pile black. Coxae with black setae and black scales, some white scales on anterior pair. Hypopleuron and metapleuron bare.

Wing (Plate 5f) light brown basally and anteriorly, hyaline posteriorly. Pigment filling cells C and Sc, cell R1 to base of cell R4, and extending along anterior margin almost to apex, a short band extending across cell R2+3 to base of cell R4; cell R2+3 filled two-thirds of way to base of cell R4, a broad triangular band extending across cell R5 halfway to base of cell R4; extreme bases of cells R5 and Cu1 and anterobasal corner of cell 1M2 pigmented, a small spot present at base of cell 2M2; cell R entirely filled; margin of pigment extending from base of cell Cu1 to posterior margin at extreme base of cell 2A. Cell R4 angled at base, with a short basal spur; r–m crossvein at basal third of cell 1M2, vein R2+3 arising slightly apicad; contact of cells 1M2 and Cu1 about 1.5 times longer than base of cell Cu1 cell 1A punctiform apically. Cell 2A not reduced, wider man cell 1A postmedially; alula vestigial, posterior margin straight. Stigmatic area lightly pigmented. Calypter lightly pigmented, fringe of hairs brown. Halter light brown, knob dark brown.

Legs mostly with black scales, some white scales posteriorly on fore and middle femora and tibiae. Middle femur with one anteroventral bristle; row of macrochaetae on hind femur incomplete basally. Anterodorsal surface of fore tibia with a few weak macrochaetae anterodorsally; hind tibia with a single row of macrochaetae anterodorsally.

First abdominal tergum with white pile laterally; lateral margins of terga two through four with black pile and linear black scales. Posterior margin of first tergum with dense, linear, white scales. Discs of terga two through four and a medial spot on five with linear black scales; remainder of fifth tergum and sixth and seventh with dense, posteriorly produced, lanceolate, truncate, overlapping, white scales. Venter with white and yellow setae anteriorly and black setae posteriorly, a few white scales anteriorly and a few black scales posteriorly.

MALE GENITALIA (Figure 72).—Gonocoxites broad basally, tapering apically; apices with flat digitate areas ventrally defined by sharp lateral and mesal carinae. Basal segment of gonostylus rounded dorsally and acute apically in lateral view, extending little past the bases of me distal segments in ventral view. Distal segment of gonostylus triangular basally in ventral view, cylindrical and gradually tapering in lateral view, extending dorsolaterally with a preapical dorsolateral blunt tooth, and with the distal part angled sharply outward forming a sharp tooth and a flat apical surface; setae fine, on ventral and interior surfaces toward base. Dorsal part of apex of epiphallus with a medial sharp tooth extending upward and backward at a 60° angle, curving downward laterally, apex deeply emarginate in dorsal view; ventrolateral part bluntly rounded apically in lateral view. Dorsal bands narrow, not united mesally toward apex, without setae. Base of aedeagus broad but not bulbous, tapering gradually to junction with ventral bands beyond dorsal bands in lateral view.

VARIATION.—The only additional specimen of this species, a male, is similar in almost every respect to the holotype. The contact of cells 1M2 and Cu1 is slightly shorter man the width of cell Cu1

DISTRIBUTION.—Anthrax laticellus is known only from the holotype and paratype. It may occur throughout the forested areas of northern and eastern Arizona.

HOLOTYPE.— “Gr. Can.” (Grand Canyon?), VII–11 (Adams collection) (RHP).

PARATYPE.—Arizona: Cochise Co., , Texas Pass, Dragoon Mts., VII–21–1917 (C.U. Expedit.) (NLM).