286 J. M. ALDRICH. 



Agonosoma rotiiniliceps sp. nov. 



Male.— Fa.ce remarkably uanow. even the upper part, white pollinose; palpi 

 and proboscis pale yellow; antennte small, yellow, tip of third joint infuscated ; 

 front with considerable white pollen. Thorax green, not very brightly shining, 

 with a brassy stripe or mark on each side towards the margin ; tegulse with their 

 cilia, halteres and hind margin of the thorax pale yellow. Abdomen yellow, 

 with green bands on the incisures, which are very narrow near the base, but 

 wider towards the apex, the last two segments are wholly green ; hypopygium 

 small, blackish, with two long, slender, yellow filaments. Legs, including coxae, 

 yellow, the tarsi moderately infuscated ; middle tibise with quite noticeable mi- 

 nute bristles, part of which form a scattered row on the inner side; fore coxae 

 with yellow bristles at tip, hind ones with a single black one on the outer side. 

 Wings hyaline, costa not ciliated, third vein bicurved at tip. 



Length 3.4 mm. 



A single male, Biscayne Bay, Fla., collected by Mrs. Annie T. 

 Slosson. 



This species must be nearly related to flavicornis, described liy 

 me from St. Vincent, W. I. That species is known only in the 

 female sex, and the types are not accesible, being in London. The 

 species here described seems to have much more yellow on the abdo- 

 men, and the bristles of the middle tibiae constitute an important 

 distinction. 



The roundness of the head is very noticeable from in front. 



Agonosoina costale sp. nov. 



Male. — P'ace and lower part of the front with thin golden pollen, not visible, 

 except in an oblique view; with a side light, however, two round spots above the 

 antennje may be observed in a direct view. Antennte black, small ; cilia of the 

 inferior orbit pale yellow. Dorsum of thorax bright green, the pleurae a little 

 pollinose with white; posterior edge of the pleurae, the halteres and tegulae, and 

 the tegular cilia, yellow. Abdomen green, with a scarcely perceptible brownish 

 yellow dust on the latter part ; first segment with a yellow crescent above, and 

 the venter yellow on its basal third ; hypopygium minute, embedded, only a pair 

 of minute dark appendages visible. Fore and hind coxae yellow, middle ones 

 infuscated more than half the length; femora and tibiae yellow, the fore tibiae 

 with no bristles, except a minute one near the base on the outer side ; tarsi ])lain, 

 infuscated from the latter part of the first joint. Wings with a yellowish tinge, 

 tlie costa somewhat thickened and ciliated to the end of the second vein with 

 close, stout, erect cilia, which do not decrease in size, but are rather large towards 

 the end. There is a peculiar and very conspicuous crook in the costa before the 

 end of the second vein, making a notch in the wing, in which are several much 

 longer hairs, standing at an angle with the surface of the wing. The segment of 

 the fourth vein from the hind crossvein to the fork is more than double the 

 length of that from the fork to the margin. 



Female. — Costa entirely destitute of any cilia ; pollen of front yellow, but very 

 difficult to perceive, tiiat of the face also vei-y indistinct, but more whitish. 



Length 3-4 mm. 



One male, two females, Tifton, Ga., June 8 and 11, 1896; collec- 

 ted by Dr. Garry de N. Hough. 



