Pagina-afbeeldingen
PDF

p. 265 (notes, comparison; fig. wing). —Wirth and Blanton, 1970b, p. 145 (redescribed; distribution; illus.). Female.—Wing length 1.20 mm. Head: Eyes (fig. 12, c) narrowly separated, bare. Antenna (fig. 12, a) with lengths of flagellar segments in proportion of 36–25–25–24–24–23– 23–24–45–48–50–50–76; AR 1.25; sensory pattern 3,8,10–15. Palpal segments (fig. 12, b) with lengths in proportion of 20–40–70–20–27; PR 3.2; third segment long, slightly

swollen distally, with a large, deep, round pit opening by a slightly smaller pore. Proboscis moderately long, P/H ratio 0.85; mandible with 15 teeth. Thorax: Yellowish brown; mesonotum with dense grayish pollen, humeral pits and anterior margin between them dark brown; mesonotum with numerous erect yellowish hairs; pleuron dark brown below. Legs (fig. 12, e) yellowish, knee spots blackish; proximal 0.6 of femora and distal 0.6 of tibiae on fore legs and midlegs brownish, hind femur with prominent dark-brown band in midportion, and hind tibia with narrow apex brown; tibial comb with four spines, the one nearest the spur longest. Wing (fig. 12, d): Pattern as figured; distal 0.6 of 2RC in a pale area; pale areas large, leaving the dark areas forming a narrow zigzag pattern; CR 0.60; radial cells both elongate, with broad lumens. Macrotrichia numerous, extending to base of wing in anal cell. Halter pale. Abdomen: Yellowish, becoming brownish distally. Spermathecae (fig. 12, f) two, rudimentary third present, sclerotized ring absent; functional ones large and ovoid, with short, slender necks; unequal, measuring 0.130 by 0.090 mm. and 0.102 by 0.068 mm. Male Genitalia (fig. 12, h).Ninth sternum with shallow caudomedian excavation, ventral membrane not spiculate; ninth tergum moderately long and tapering, with long, slender, apicolateral processes. Aedeagus with basal arch extending to nearly half of total length, basal arms slender and curved; distal portion tapering to long, slender, median point. Parameres (fig. 12, g) separate; each with slender anterolateral process; main portion long and straight, tapering to slender simple tip abruptly bent laterad and ventrad. Distribution.—Dominica, Lucia, Saint Vincent (fig. 2). Types.—Three female syntypes, Saint Vincent, H. H. Smith collector

FIGURE 12.-Culicoides decor: a, Female antenna; b, female palpus; c, female eye separation; d, female wing; e, hind femur and tibia; f, spermathecae; g, male parameres; h, male genitalia, parameres removed.

[graphic][graphic]

Saint

(British Museum (Natural History), London). West Indian Records.DOMINICA: Clarke Hall, AprilJune 1964, O. S. Flint, light trap, 8 males, 22 females; same, July-August 1964, T. J. Spilman, light trap, 18 males, 24 females; same, January–March 1965, W. W. Wirth, light trap, 40 males, 50 females; Layou River mouth, 20 January 1965, Wirth, at light, 3 females; Macoucheri, 12 February 1965, Wirth, at light, 3 females; South Chiltern Estate, 19 February 1965, Wirth, light trap, 2 females (Wirth and Blanton, 1970b). SAINT LUCIA: Castries, Fairview, 14 April 1959, R. Darsie, light trap, 1 male; Gros Islet, Yacht Club, 27 October 1967, J. B. Davies, at light, 1 female; Saint Lucia Beach Hotel, 27 October 1967, Davies, at light, 1 female (Wirth and Blanton, 1970b). Discussion.—The C. nigrigemus group was reviewed by Wirth and Blanton (1970b), who found it to be circum-Caribbean in distribution (fig. 2). Three of the seven known species occur in the West Indies and are not found elsewhere. Of these, C. farri is endemic to Jamaica, C. dominicanus is endemic to Dominica, and C. decor is known to occur on three islands of the Lesser Antilles. C. decor is distinguished from the other species of the C. nigrigenus group of the subgenus Anilomyia by its extensively pale hind femur with only midportion dark, its large spermathecae, moderately long proximal antennal segments, and antennal sensory pattern, 3,8,10–15. Two other species of this group have been reared from wet debris held in leaf axils of bromeliads in Trinidad and Mexico. Williams' (1964) record of C. decor reared from a bromeliad in Trinidad was a misidentification of C. nigrigenus (Wirth and Blanton, 1970b). Larval Habitat.—Unknown. Biting Habits.-Unknown.

-En

Culicoides dominicanus Wirth and Blanton

(Figs. 2 and 13)

Culicoides dominicanus Wirth and Blanton, 1970b, p. 146 (male, female; Dominica; illus.).

Female.—Wing length 1.22 mm.

Head: Eyes (fig. 13, c) narrowly separated, bare. Antenna (fig. 13, a) with lengths of flagellar segments in proportion of 32–20–20–20–20–20– 20–20–50–56–60–60–92; AR 1.85; sensory pattern 3–15. Palpal segments (fig. 13, b) with lengths in proportion of 15–40–52–17–17; PR 2.3; third segment swollen distally, with a large, round, deep sensory pit. Proboscis moderately long, P/H ratio 0.75; mandible with 15 teeth.

Thorax: Yellowish brown, mesonotum yellowish pollinose, dark brown on anterior margin; pleuron dark brown below; mesonotum with abundant yellowish hairs. Legs (fig. 13, e) brownish; knee spots blackish; fore femur and midfemur with subapical, and fore tibia and midtibia with basal, broad yellowish bands; hind femur dark brown with broad subapical yellowish ring, hind tibia yellowish except at extreme

tip; tibial comb with four spines, the second from the spur longest. Wing (fig. 13, d): Pattern as figured, as in C. decor; CR 0.62. Macrotrichia numerous, extending to base of wing in anal cell. Halter pale. Abdomen: Yellowish, becoming brownish distally. Spermathecae (fig. 13, f) two, ovoid with short slender necks; moderately small, slightly unequal, measuring 0.080 by 0.058 mm. and 0.072 by 0.055 mm.; rudimentary third spermatheca present, sclerotized ring absent. Male Genitalia (fig. 13, h).Ninth sternum with shallow caudomedian excavation, ventral membrane not spiculate; ninth tergum short and tapering, with moderately long, slender, diverging apicolateral processes. Aedeagus with basal arch extending to more than half of total length, rather angulate mesad, basal arms moderately stout and slightly bent; distal portion tapering to long slender median point. Parameres (fig. 13, g) separate; each with short anterolateral arm; midportion straight and moderately swollen at base, tapering distally to slender simple tip abruptly bent laterad and ventrad. Distribution.—Dominica (fig. 2). Types.—Holotype, female, allotype, male, 0.3 mi. e. Pont Casse, Dominica, 6 May 1964, O. S. Flint, at light (USNM 70653). West Indian Records.DOMINICA: Castle Bruce Junction, 21 March 1956, J. F. G. Clarke, 4 males; d'Leau Gommier, 17 March 1956, Clarke, at light, 5 males, 2 females; Point Lolo, 25 January

[merged small][merged small][merged small][ocr errors]

'IGURE 13–Culicoides dominicanus: a, Female antenna; b, female palpus; c, female eye separation; d, female wing; e, hind femur and tibia; f, spermathecae; g, male parameres; h, male genitalia, parameres removed.

[graphic]
[ocr errors]

Culicoides farri Wirth
and Blanton
(Figs. 2 and 14)

Culicoides farri Wirth and Blanton, 1970b,
p. 148 (male, female; Jamaica; illus.).

Female.—Wing length 1.25 mm.

Head: Eyes (fig. 14, c) narrowly separated, bare. Antenna (fig. 14, a) with lengths of flagellar segments in

proportion of 32–22–22–22–22–22– 23–24–45–45–50–54–70; AR 1.35; sensory pattern 3,10–15. Palpal segments (fig. 14, b) with lengths in proportion of 15–30–46–15–18; PR 2.0; third segment short and broad. with a large, round, moderately deep sensory pit. Proboscis moderately short, P/H ratio 0.68; mandible with 13 teeth.

FIGURE 14.—Culicoides farri: a, Female antenna; b, female palpus; c, female ey Separation; d, female wing; e, hind femur and tibia; f, spermathecae; g, mal parameres; h, male genitalia, parameres removed.

[graphic]
« VorigeDoorgaan »