32 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



shining violet; antennae yellow, small; palpi yellowish; lateral and 

 inferior orbital cilia white. 



Thorax and scutellum dark blue, the depressed space in front of 

 the scutellum more bronze; lower surface of scutellum reddish; the 

 minute hairs on the thorax and abdomen yellow; bristles of thorax 

 black. Abdomen dark blue-green, the incisures narrowly blackish. 

 Hypopygium (fig. 43) black, the small spatulate lamellae dark yellow. 



Fore coxae yellow with short, stiff, black hairs; middle and hind 

 coxae more brownish; femora and fore tibiae yellow; middle tibiae 

 and tarsi yellowish with the extreme tips of tibiae and each tarsal 

 joint brown; hind tibiae and tarsi brown; fore tarsi yellow with 

 the last joint brown; joints of fore tarsi as 41-30-18-7-10; those of 

 middle ones as 71-35-20-9-8; joints of posterior tarsi as 

 24^-4-24-11-7. 



Wings grayish, apical half with a dark cloud beginning a little 

 before the cross vein and reaching from the costa to a little back of 

 fourth vein and extending to fifth vein along each side of the cross 

 vein; last section of fourth vein gently bent before the middle, then 

 approaching third vein, reaching the wing margin before the apex 

 of the wing; last section of fifth vein nearly twice as long as the 

 cross vein. 



Described from two males taken by August Busck February 2, 

 1911, at Paraiso, Panama Canal Zone. 



Type.— M^Iq, Cat. No. 41046, U.S.N.M. 



Genus THINOPHILUS Wahlberg 



Thinophilus Wahlberg, Ofv. Kongl. vet. Akacl. Forhandl., vol. 1, 1S44, p. 

 37. — LOEW, Mon. North Amer. Diptera, pt. 2, 1864, p. 184. — Wheeler, 

 Ent. News, vol. 7, 1896, p. 153; Proc. California Acad. Sci., vol. 2, 1899, 

 p. 69. — Van Dxtzee, Annals Ent. Soc. Amer., vol. 19, 1926, p. 35, table of 

 species. 



THINOPHILUS PANAMENSIS, new species 



Male. — Length, 2.7-3 mm. Face wide, dark green, almost black, 

 with thin gray pollen; palpi yellow, darkened at base, cut off at 

 apical end in a nearly straight line; antennae yellow, of the usual 

 form ; arista black ; lower orbital cilia and beard white. 



Thorax greenish black with slight coppery reflections, in well- 

 preserved specimens covered with gray pollen, which gives it a mot- 

 tled appearance. ' Abdomen very dark green with coppery reflections, 

 nearly bare. Hypopygium (fig. 44) black, large, extending under 

 the venter to the middle or even the base of third segment. 



Coxae black, anterior pair with yellow tips and short white hair; 

 femora, tibiae and tarsi yellow ; tarsi not or scarcely darker at their 

 tips; bristles of hind tibiae as long as the diameter of the tibia; 

 three first joints of hind tarsi as 15-15-10. Halteres yellow. 



