89 



the femora, bases of the tibia* and last four joints of the tarsi slightly darker, 

 moiv brownish-yellow, knob of hulteres yellowish-brown, ovipositor greatly 

 flattened, the basal segment one and one fourth times as long as the last 

 abdominal segment. Length, 7 mm." Described from one female specimen. 

 Found in the Island of Mauritius, Africa. Type, U.S. National Museum, 

 No. r>,788. 



The Sudan Fruit Fly. 

 Dacus, sp. 



(Theobald Second Report of the Wellcome Research Laboratories, 

 Gordon Memorial College, Khartoum, 1906.) 



On page 93 Theobald, in his " Report on Economic Entomology," figures 

 and gives a general description of a fruit-fly belonging to this genus that is 

 common in th<- Sudan, where it is a serious trouble to the melon growers of 

 that part of Africa. He says : " This species comes very near Froggatt's 

 species (Dacus tryoni}, the Queensland maggot-fly, but is quite distinct." 



His description is as follows: "The Sudan melon fly is somewhat wasp- 

 like in general appearance. The head is yellowish between the eyes, which 

 are large and dark, there is a dark spot on the occiput and two oval black 

 spots on the face below the antennae, which are yellow with *dark apex ; the 

 arista is simple. The thorax is slaty-grey, with minute dark brown specks, and 

 fine, pale, backwardly-directed short hairs, a bright nude yellow area at each 

 shoulder, a yellow nude plate on each side in front of the base of each wing, 

 which passes a narrow, wedge-shaped area into the median transverse 

 suture, the lower area of the spot is formed on the pleura?, and there is a 

 smaller one below and another on the pleurae just behind the wings; the 

 scutellurn is yellow and nude, and the metanotum deep slaty-grey. 



" The abdomen is much contracted basally and acute apically, the basal 

 segment is brown, the second has a yellow apical border, the remainder dark 

 brown. 



" The legs are dull, pale yellowish, somewhat transparent basally ; the feet 

 dark brown, the apex of femora and base of the tibia? reddish-brown. 



"The transparent wings are brown along the costa, and there is a dark 

 brown vein below. 



" The chaetotactic characters are very marked, there being four black 

 bristles on the head, four on the front of the thorax, and two on each side of 

 the median suture, one behind the root of the wings, and two long ones on 

 the scutellum. The whole abdomen has fine, pale, backwardly-projecting 

 bristle-like hairs. Length, 10 5 mm." 



I am indebted to Mr. Harold H. King, Economic Entomologist to the 

 Wellcome Research Laboratories, for specimens of this very interesting 

 fruit-fly. 



The Olive Fly. 



(PI. I, fig. 2.) 

 Dacus olew, Rossi. 



(Fauna Etrusca, 11, 317, 153S, 1780.) 



There is no species of the genus that causes more damage than the olive- 

 fly of the Mediterranean region. The adult fly punctures the ripening olive 

 and deposits its eggs beneath the skin. The maggots feeding upon the tissue 



