ART. 9 FLIES OF THE GENUS STYLOGASTER ALDEICH 23 



Antennae rather short, first joint wliite, the other two brown, the 

 third reddish below, as long as second. Proboscis yellow to middle 

 of basal joint. Mesonotum brownish black, the color reaching the 

 white humerus behind and mesially. Mesopleura brown to sterno- 

 pleura. Posterior part of mesonotum opaque dark brown. Scu- 

 tellum and middle of metanotum brown. Humeral 1 ; notopleural 

 1; supraalar 1. 



Abdomen dark brown, first segment with rather numerous black 

 lateral bristles arising from a wdiite area; second segment whitish 

 on basal fifth, yellow along sides with a few large black lateral 

 bristles in a single row; third and fourth segments with narrow 

 basal yellow band wider at sides; fifth segment brown, narrowly 

 yellow at base and with yellow sides ; sixth segment narrow^, blackish ; 

 seventh segment blackish. Genitalia yellow, last sternite not exca- 

 vated posteriorly, Avith a distinct median groove basally, the hind 

 margin Avith comb of fine black setules and before these two separated 

 small dark spots bearing minute black hairs. 



Front and middle legs yellow, not very pale; hind femora brown 

 with median paler area not very conspicuous, inner and lower 

 sides of femora with long hairs on basal half; hind tibia light brown 

 with numerous erect fine hairs on flexor side from middle; hind 

 tarsi brown. 



Wing sliglitly brownish, the first posterior cell barely wider than 

 submarginal, hind cross vein almost continuous witli last section of 

 fourth vein, which is nearly straight. Tip of second vein nearer 

 to base than anterior end of hind crossvein. 



Length, 5.2 mm. 



Described from two males. The type is from Lombardia, Hon- 

 duras (W. M. Mann) ; the other male is from Laristal, Peru, received 

 from Dr. O. Krober. 



Type.—M?i\Q, Cat. No. 43031, U.S.N.M. 



STYLOGASTER RECTINERVIS, new species 



Male. — Frontal triangle rather large, shining brown, liardly 

 reaching beyond middle of front; front dark reddish brown, almost 

 uniform to lunule, the lateral orbital extensions of the facial color 

 hardly perceptible; first antennal joint whitish, second and third 

 dark yellow, third brown at tip and just equalling length of second. 

 Proboscis yellow to middle of basal joint. Mesonotum brownish, 

 not so dark as in most species, the dark color, however, comes close 

 to the humerus behind and on the inner side. Mesonotum with only 

 a trace of dark, the dark color is interrupted across the transverse 

 suture and behind that is principally confined to three spots with 

 lighter margins. Scutellum and middle of metanotum dark brown. 

 Humeral 1 ; notopleural 2 ; supraalar 1. 



