126 PROC. ENT. SOC. WASH., VOL. 21, NO. 6, JUNE, 1919 



(U. S. Dept. Agri., Bull., 743, 1919). It has been received in 

 bred series from Guatemala and Equador. According to Sasscer 

 the caterpillar eats galleries in the seed similiar to those of the 

 two large weevils which infest avocado, but easily distinguished 

 from these by the presence of the loosely packed frasse pellets. 

 Mr. J. Birch Rorer has sent a bred series from Equador and re- 

 ports that the species does a great deal of damage to avocado 

 there. The moth lays its eggs on the surface of the nearly ripe 

 fruit and the larva eats through the flesh into the seed. It feeds 

 on the seed until ready to pupate, three weeks or a month and, 

 then eats its way out through the flesh to pupate. It is almost 

 impossible according to Mr. Rorer to buy a single avocado in the 

 market of Equador, which has not at least one of the worms in 

 the seed; more often there are two or three. It would be a bad 

 pest to introduce into the United States. 



The fullgrown larva is nearly an inch long. Head light brown 

 with blackish eyespots and mandibles. Thoracic shield light 

 brown with darker brown anterior edge; body light fuscous with 

 small blackish brown tubercles. Spiracles on eighth abdominal seg- 

 ment situated high up on dorsum. Anal shield dark brown. 

 Legs and prolegs normal, a single complete circle of alternating 

 long and short crotches. 



A NEW GENUS IN SCATOPHAGIDAE (DIPTERA). 



BY CHARLES T. GREENE, U. S. Bureau of Entomology. 

 This most remarkable fly, 1 described below, was in some ma- 

 terial which was submitted for determination by Mr. J. M. 

 Jessup, who was the geologist of a party from the Smithsonian 

 Institution. The party made a journey from Rampart House 

 on the Yukon River, northward along the Alaska- Yukon Boundary 

 to the Arctic Ocean and returned by the same route. This fly 

 was captured on the return trip. 



AMBOPOGON, n. gen. 



One pair frontal bristles, below each of them is a bristle-like hair which is 

 larger than the other hairs of the front; ocellar bristles long and directed 

 forward; inner and outer vertical bristles near the eye (inner vertical may 

 stand more erect than shown in drawing) ; post-verticals very large and di- 

 rected backward. Antennae missing. Proboscis small; palpi short, slender 

 and with a number of very short hairs and two long bristle-like hairs on the 

 under side; no large apical bristle. One pair dorsocentrals, one prothoracic, 

 no stigmatic bristle, one humeral, two notopleurals (the larger one in front), 



1 Described through the courtesy of Dr. J. M. Aldrich, Custodian of 

 the Diptera, U. S. National Museum. 



