AET. 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 11 



Described from one pair, taken by J. M. Aklrich, May 7 and 8, 

 1926, at Quirigua, Guatemala. 

 Type.— Cat. No. 41029, U.S.N.M. 



PSILOPUS SEMICILIATUS, new species 



Male. — Length 5 mm.; of wing 5.5 mm. Face green above, lower 

 part blue, the suture a little below the middle, pollen along the orbits 

 quite thick. Palpi and proboscis black with black hair. Front shin- 

 ing blue. Antennae black, rather short, bristles of second joint nu- 

 merous and more than twice as long as the antennae; third joint 

 small ; arista dorsal, as long as width of head ; orbital cilia and hair 

 on lower part of head long, white. 



Thorax green, sides and posterior half of dorsum blue; scutellum 

 with two pair of long slender bristles; bristles of thorax and abdo- 

 men long ; three basal segments of abdomen blue, the apical segments 

 green with bronze reflections. Hypopygium (fig. 18) black, its 

 lamellae black with about six stout spines in a group on one edge. 



Coxae and femora green; tibiae and tarsi black; fore coxae with 

 white hair, which is longer than their diameter, and two slender black 

 bristles; all femora with long white hair below; fore tibiae with 

 a row of six black bristles on lower posterior edge, which are longer 

 than the fourth joint of fore tarsi and become a little shorter apically ; 

 middle tibiae with five short, slender bristles on upper anterior and 

 four on upper posterior edge of basal half, also one a little longer, 

 stouter and nearly erect, near the tip on lower anterior edge ; posterior 

 tibiae wath about nine slender bristles on anterior surface of basal two- 

 thirds these are fully as long as those on fore tibiae; first joint of 

 fore tarsi (fig. 19) with one erect bristle near the base below and 

 about ten on apical half, which are not in a row ; joints of fore tarsi 

 as 106-13-15-16-8; those of middle ones as 155-30-25-15-11; joints 

 of posterior pair as 105-23-20-15-9 ; the last four joints of hind tarsi 

 a little swollen. Calypters, their cilia and the halteres black. 



Wings grayish Avith the usual crossbands, the hyaline space between 

 them reaching third vein, they do not reach the hind margin of the 

 wing; the brown extends along the costa from just before the tip of 

 first vein to tip of second vein ; hairs on the costa quite long, but re- 

 cumbent; first vein does not reach the middle of the wing; cross vein 

 53, last section of fifth vein 28, fourth vein from the cross vein to 

 the^ork 62 and from the fork to the wing margin thirty-two fiftieths 

 of a millimeter. 



Described from one male, taken by J. M. Aldrich, Maj^ 2, 1926, at 

 Antigua, Guatemala. 



Type.—M^\Q, Cat. No. 41030, U.S.N.M. 



