262 CALIFORNIA ACADEMY OF SCIENCES [Pioc. 4th Sm. 



falcatus it is scarcely one and a fourth times as long- as the 

 first ; similis is also larger and the thorax has a distinct median 

 vitta which is not found in falcatus. 



Holotype, male (No. 513), from Los Angeles, in collection 

 of the California Academy of Sciences. Allotype, female from 

 Los Angeles, in collection of the author. Paratypes in both 

 collections. 



3. Medeterus novus, new species 



Male: Length 1.75 mm. Face and front green with whitish pollen; pro- 

 boscis rather large, yellow, shining ; antennae yellow, small ; arista dorsal, 

 pubescent ; thorax, including the pleurae, light green dulled with gray 

 pollen ; scutellum with the posterior margin yellow, covered with white pol- 

 len, and with one pair of long, very slender bristles ; acrostichal bristles 

 small ; the bristles of thorax and scutellum yellowish brown in certain lights ; 

 bristles above fore coxae pale yellow ; abdomen dark greenish, more shining 

 than the thorax; hypopygium brownish yellow; legs including fore coxae 

 pale yellow with yellow hairs and bristles ; tarsi scarcely darkened at tip ; 

 first joint of hind tarsi scarcely half as long as second ; tegulae, their cilia and 

 the halteres pale yellow; wings hyaline, tinged with gray; venation typical 

 of the genus; veins yellowish brown, more yellow at the root of the wing; 

 fourth vein ending in the apex of the wing close to the tip of the third; 

 last section of fifth vein one and a half times as long as the cross-vein. 



Described from one male taken at Great Falls, Va., June 12, 

 by Mr. Nathan Banks. 



The yellow antennae, legs and bristles of this species together 

 with its small size would suggest its being a Thrypticus, but 

 the venation is that of a typical Medeterus, as is also its large 

 proboscis and the form of its hypopygium. 



Holotype, male, in collection of the author. 



4. Medeterus longinquus, new species 



Female : Length 2 mm. Face and front green with a very little gray 

 pollen; antennae black, third joint small; arista apical; proboscis small; 

 thorax and scutellum light green, somewhat shining but dulled with gray 

 pollen ; acrostichal bristles in two rows ; lateral and posterior bristles of 

 the thorax large, black; scutellum with one pair of bristles; abdomen 

 darker green than the thorax, shining, its hairs pale ; coxae and base of 

 femora blackish ; apical half or more of fore and middle femora, tips of 

 hind femora, all tibiae and tarsi pale yellow; last tarsal joint blackened; 

 extreme tips of all tarsal joints brownish ; hind femora with rather con- 

 spicuous yellow hairs; second joint of hind tarsi one and a fourth times 

 as long as the first; tegulae, their cilia and the halteres yellow; wings 

 grayish ; veins yellowish, brown, more brown on the outer and costal 

 portion; last section of the fifth vein three times the length of the cross- 

 vein. 



