NO. 2227. FLIES FROM GUAM AND THE PHI LTPPIN ES—FAUKER. 91 



Genitalia. — Similar to those of 8. iuherosa Pandelle, S. sarrace- 

 nioides Aldrich, etc. Accessory plates hairy. Fifth ventral plate 

 not distinguishable from that of S. Jiarpax Pandelle; base with sharply 

 angular median ridge, in profile its posterior extremity not upturned; 

 lamellae expanded, their inner edges with prominent fringe of bristles. 



Female. — These differ from males in the following important 

 characters : 



Head. — Breadth of front at its narrowest part equal to or slightly 

 less than eye width. Frontal vitta a little wider than each para- 

 frontal. 



Thorax. — Vestiture of scutellum very short, strongly reclinate. 



Legs. — Posterior trochanter with slender, apical bristle; bristles 

 of intermediate row of anterior face of femur lacking or a few scarcely 

 differentiated bristles proximally; posterior face usually with two 

 ventral, proximal bristles. Middle femur with complete posterior 

 ventral row of short bristles, "comb" not differentiated. 



Ohaetotaxy. — Three or four sternopleurals, rarely five. 



AJ)dom€n.—OY&\; vestiture throughout of short reclinate bristles 

 except that of ventral surface of fourth notum, which is erect and 

 hairy. 



Genital segments. — -Not protuberant, not visible from above. 

 First segment not divided into two lateral lips but often very 

 sUghtly carinated (anterio-posteriorly) along the mid-dorsal line, 

 ground color varies from that of abdomen (blackish) to orange 

 brown; often with same pollmose colors as abdomen; spiracles 

 central, but usually concealed by edge of fourth notum. Fifth 

 and sixth ventral plates fused, wider than fourth; fifth usually 

 grayish polliaose, much broader than long, its posterior margin 

 with a few bristles (one or two) at each side; the heavily chitinized 

 portion of sixth polished, consisting of a short, anterior part and 

 two rounded posterior lobes (one on each half), each lobe with 

 apical bristles. 



Described from three male and eight female specimens. 



Range. — Guam, PhiUppine Islands. 



This fly is of interest primarily as a subspecies of Sarcoyliaga 

 tuherosa Pandelle. It is at once distinguished from other described 

 subspecies by the presence of but a single row of black cilia behind 

 the eyes and the white vestiture on the posterior portion of the cheek. 

 All other subspecies known have tliree rows of black cilia and the 

 cheek vestitm-e black. The tip of the forceps prongs of suhtuberosa 

 are attenuated. At least another subspecies, S. tuherosa harpax 

 Pandelle occurs in the Orient.^ A male and female were included 

 in the material from the Phihppines. 



1 Bottcher (Ent. Mitt., vol. 1, 1912, p. 164) reports it from Formosa. 



