ART. 10 TROPICAL AMERICAN DIPTERA — VAN DUZEE 37 



this enlargement being almost lobelike; first joint of hind tarsi with 

 nine long spines below and one short one above; joints of fore tarsi 

 us 28-13-12-5-5 ; of middle ones as 82-17-13-G-5 ; joints of posterior 

 pair as 17-3G-21-9-7. Calypters, their cilia and the halteres yellow. 



Wings a little grayish, veins yellowish, costa brown ; venation 

 normal ; last section of fifth vein 20, cross vein fonrteen-fif tieths of 

 a millimeter long. 



Described from four males, taken by J. M. Aldrich, April IG, 1926, 

 at La Providencia, Obispo, Guatamala. 



Type.— Mule, Cat. No. 41050, U.S.N.M. 



This is ver}^ much like ininor and palestns Becker, described from 

 Paraguay and Peru, it differs from both in the color of the legs and 

 feet, also more or less in the form of the fore tarsi. 



MEDETERA FLAVISETA, new species 



Male. — Length, 2 mm. Face dark green, almost black; antennae 

 black, third joint conical in outline, pointed at tip, nearly twice as 

 long as wide ; ocular bristles yellow. 



Thorax dark green, the depressed space on posterior slope cop- 

 pery; bristles o,f thorax yellow (bristles of scutellum broken off) ; 

 bristles above fore coxae whitish. Abdomen blackish green with 

 coppery reflections, its hair pale. Hypopygium black, somewhat 

 shining, with small yellow appendages. 



Coxae black; fore and middle femora blackened al base, posterior 

 pair almost wholly yellow; tibiae and tarsi yellow, tips of the tarsi 

 black; joints of fore tarsi as 10-12-10-4-5; of middle ones as 19-19- 

 12-9-4; joints of posterior pair as 8-24-14-9-6. Calypters, their 

 cilia, and the halteres yellow. 



Wings grajdsh; venation normal; last section of fifth vein 14, 

 cross vein seven-fiftieths of a millimeter long. 



Described from one male, taken by Nathan Banks, July 13, 1924, 

 at Barro Colorado, Panama Canal Zone. 



Type. — In the Museum of Comparative Zoology. 



Genus THRYPTICUS Gerstaecker 



Thryptwus Gebstaeckek, Slettiii. Ent. Zeit., 186G, p. 43. — Whf.exee, Psyche, 

 vol. 5, 1890, p. 375 (Aphantotimus) ; Proc. California Acad. Sci., vol. 2, 

 1899, p. 30. table of species. — Aldrich, Trans. Ent. See. London, 1896, 

 p. 339 (Xanthotricha). — Van Duzee, Psyche, vol. 22, 1915, p. 84, table 

 of species ; Psyche, vol. 28, 1921, p. 124, table of species. 



THRYPTICUS ACUTICAUDA. new species 



3/aIe. — Length 2 mm. Upper part of face and the front violet, 

 lower part of face green ; antennae dark yellow with the third joint 

 black. 



