Robustagramma angustistylum Cui and Marshall, 2005

Marshall, Stephen A. & Cui, Yongsheng, 2005, Systematics of Robustagramma, a new genus of New World Sphaeroceridae (Diptera), Zootaxa 1026 (1), pp. 1-122 : 66-67

Robustagramma angustistylum Cui and Marshall , new species

( Figs. 178–184 )

As described for Robustagramma biangulatum except as follows.

Body length 1.4–1.8 mm. Face and antenna brown. Facial ridge of male between antennae slightly narrower than width of scape, but female facial ridge slightly broader than width of scape. Eye height 2.5–2.7 times genal height.

Wing with length of second costal sector ca. 0.42X length of third. Mid tibia of male with an apicoventral bristle and several short ventral bristles on distal third. Mid femur of male with 6 ventral proximal bristles.

Male terminalia: In lateral view, surstylus tapered apically and cercus slightly ampliate. Ejaculatory apodeme slightly shorter than half of aedeagal apodeme.

Female terminalia: Spermatheca with the distal portion similar in size to the basal portion. Paired spermathecae with ducts ca.1.7 times length of spermatheca.

Holotype (♂, DEBU) and paratypes (3 ♀, DEBU): MEXICO: Guerrero. 45 km NE Ixtapa , 10–12.vii.1987, B. Gill.

Other paratypes: HONDURAS: Francisco Morazán. 6 km SE Zamorano , 7.vi.1994, dung trap, H. Howden (2 ♂, 3 ♀, DEBU) . MEXICO: Guerrero. 9 mi NE Iguala , 4400ft, 29.viii–4.ix.1971, deciduous forest, human dung, A. Newton (1 ♂, 2 ♀, DEBU) . Oaxaca. 9 mi. E El Camarón , 4300ft., human dung, 23.viii–6.ix.1973, A. Newton (2 ♀, DEBU) .

Etymology: The specific epithet refers to the narrow surstylus.

Figures

FIGURES 178–184. Robustagramma angustistylum sp. nov.: 178, posterior view of male terminalia; 179, lateral view of male terminalia; 180, lateral view of male internal genitalia; 181, male sternite 5; 182, dorsal view of female terminalia; 183, ventral view of female terminalia; 184, spermathecae.