Arenivaga bolliana (Saussure 1893)

Arenivaga bolliana (Saussure) (Plate IX, figures 3 to 5.)
1893. [Homoeogamia] bolliana Saussure, Rev. Suisse Zool., i, fasc. 2, p. 298. [cT, Texas.]
1904. Homoeogamia bolliana variety nigricans Caudell, Mus. Brooklyn Inst. A. & S.. Sci. Bull., i. p. 107. [o'; Esperanza Ranch, Brownsville, Texas.)
This Species is much the largest of the present genus. It is closely related to A. rehni, but may be readily separated by its much larger size, distinctive male genital characters, and different form, coloration and pronotal marking, when present, in the female.
The males exhibit much color variation; specimens with tegmina, wings and all but the broad pale cephalic margin of the pronotum, solid blackish, with a perceptible brownish suffusion, are before us from the Rio Grande valley (Brownsville, Eagle Pass). These have been named nigricans by Caudell. The condition is simply the maximum of intensive coloration found in the species, and every gradation to the normal type is found in the series before us. As we have already frequently observed, in the Orthoptera color variations are by no means worthy of varietal significance, and we consequently place nigricans in the synonymy here.
To the given male characters, we would add the following observations.
(Waco, Texas.) Interocular width slightly less than, to slightly more than, half the interocellar width. Pronotum with angles usually sharply rounded, sometimes quite broadly rounded, as in yl. erratica; this variation sometimes shown on one side and not on the other. Concealed genital hook proportionately very small when compared with that of rehni or erratica, shaft curving gently inward to near distal extremity, which is sharply curved inward, not enlarged, with apex sharp, directed proximad. Dextro-dorsal concealed genital plate, a large, flattened, smooth corneous finger, somewhat arcuate; dextro-ventral concealed genital plate, a large, irregular, corneous disk, strongly concave, with dorsal margins very broadly and strikingly shagreenous.
The adult female being hitherto unknown we here describe that
sex.
9 ; Carrizo Springs, Dimmit County, Texas. (A. Wadgymar.) [Hebard Collection.]
Description of Female. Very unlike male, apterous, size much larger, form suborbicular. Dorsal surface roughened and leathery, covered with very short, but stout, minute hairs, most of which are usually rubbed oft", except along the margins of the body. Pronotum broad, cei)halic margin evenly arcuate, at an angle of slightly over 90°, caudal margin weakly produced mesad, with sides broadly concave. Supra-anal plate transverse, trai)eziform. with distal angles rounded; mesal third of caudal margin truncate, with an indication of mesal emargination. Subgenital plate very large, roundly produced mesad.

Arenivaga bolliana, known generally as the Boll's sand cockroach or Boll's sandroach, is a species of cockroach in the family Corydiidae. It is found in North America.

Arenivaga bolliana (лат.) — вид песчаных тараканов-черепашек рода Arenivaga из семейства Corydiidae (или Polyphagidae). Обнаружены в Северной Америке: США (штат Техас и другие), Мексика.

Male. NB: Holotype is half spread therefore GW is estimated. Measurements. Holotype TL = 24.6 mm, GW = 13.0 mm, PW = 8.64 mm, PL = 5.60 mm, TL/GW = 1.89, PL/PW = 0.65. EW = 0.40 mm; OW = 0.60 mm. Among paratypes range of TL 20.1–30.7 mm; range of GW 9.6–15.3 mm; range of PW 7.25–10.10 mm; range of PL 4.74–6.17 mm. Head. Two ocelli large, ovoid and protruding (0.50 × 0.40 mm); vertex dark brown, with small ridges between apices of eyes; interocellar space concave, dark brown. Frons medium brown, tectiform, concave with fine horizontal corrugations; bound on either side by ridges extending from inner apex of ocelli outwards to lateral edges of clypeus. Anterior portion of frons medium brown, bulbous; clypeal suture demarcates medium brown anteclypeus. See Fig. 33d. Pronotum. Pronotum with broad anterior margin of translucent waxy beige, extending and narrowing laterally; variable length orange-brown setae along anterior margin; dorsal surface of pronotum covered with short orange-brown setae; pronotal pattern impressed ranging from medium brown to very dark brown, all with extensive aura; no discernible detail. See Fig. 33c. Body. Wing brace absent. Legs and body medium orange-brown; subgenital plate asymmetrical with posterior edge emarginated, rounded apices. See Fig. 33b. Forewings. Wings extended beyond abdominal apex (up to ~30% of the total wing length); color ranges from light brown with virtually no blotches to every level of blotchiness to uniform dark brown depending on specimen; surface opaque and matte. See Fig. 33a. Genitalia. Right dorsal phallomere composed of bulbous lightly sclerotized wavy dorsally projecting lobe, articulated with right ventral phallomere on lateral side; central field broad, slightly sclerotized; medial margin sclerotized, with toothed edge and slight central indentation. Small central sclerite finely punctate, folded lengthwise and attached dorsally. Right ventral phallomere extends from articulation into shagreened lobe with broad indentation at posterior end and medial concavity; after narrow gap, wide concave shagreened flange. Folded anterior portion of left phallomere of moderate width, setose, otherwise unmodified. Genital hook with rounded head with moderate hook; arm smoothly curved. See Fig. 34.

Arenivaga bolliana is found across southern and eastern Texas and far northeastern Mexico. There are two isolated records in central and western Mexico, and two more in Florida. It is impossible to say if these are established populations or incidents of specimens transported by man or weather. It is hard to imagine four such incidences occurring and then the transported specimens being collected but it is remotely possible. See Fig. 35.