.1. R. MALLOCH 191 



proboscis not no(i('('al)ly thicker than normal. Thorax with one to two 

 l)airs of well-dcvcl()i)ed presutural acrostichals; preahir bristle distinctly 

 ov(>r half as long as the one behind it ; sternoiileura with three bristles. Third 

 ventral abdominal segment armed with longer decvunbent bristles on its 

 disc than are any of the other segments; second dorsal segment slightly 

 eh^ngated; hypopygium small; fifth ventral segment with a few long bristles 

 on outer half of each process up to apex. Fore tibia with one antero-dorsal 

 and two postero-ventral bristles; tarsus slender, longer than tibia; mid femur 

 with three to five long postero-ventral bristles; mid tibia with one antero- 

 dorsal, one postero-dorsal and two posterior bristles; hind femur without 

 strong postero-ventral bristles, the antero-ventral surface with four to seven 

 bristles on apical half; hind tibia with two to hjur antero-dorsal and three or 

 four postero-dorsal bristles, the antero-ventral surface with two to five short 

 setulae, and the postero-ventral surface with five to seven weaker setulae. 

 Costal thorns both moderately long; veins three and four subi)arallel, outer 

 cross-vein nearly straight. Length, .'5 to 6 mm. 



Type. — cf ; Oregon, Illinois, Jnne 19, 1917. Paratopes. — 

 Males; same locality, June 19 and 20, 1917, (J. R. :\Ialloch). 

 Type and paratype in the collection of the Illinois State Natin-al 

 History Survey; paratype in the collection of the Academy of 

 Natural Sciences of Philadelphia. 



This species differs from lincari.s Stein in having two iiosterior 

 fore tibial bristles, and no anterior bristle on mid til)ia in addition 

 to the antero-dorsal one; in other respects the species agree 

 closely. 



Hylemyia occid en talis sp. n. 



Male. — Black, shining. Frontal triangle, facial orliits and cheeks red<iish 

 br(jwn; orbits overlaid with silvery pile; palpi black, antennae black; arista 

 black on the basal swollen portion, remainder yellowish. Thorax with 

 whitish pruinescence on disc, when viewed from behind more or less dis- 

 tinctly quinque-vittate. Abdomen with a broad irregular dorso-central 

 black stripe; hypopygium slightly pruin(jse. Legs black. Wings slightly 

 infuscated on anterior half. Calyptrae white. Halteres yellow. 



Eyes narrowly separated above, interfrontalia obliterated at narrowest 

 part of frons; triangle large; facial orbits in profile protruded as far as width 

 of third antennal joint; cheek nearly twice as wiile as orbit in prcjfile; mar- 

 ginal bristles numerous and strong, curving upward but not invading cheek 

 except along margin; face straight, mouth-margin not much protruded; 

 antennae of moderate length, third joint 1.5 as long as second; arista swollen 

 for a short distance at base, minvitely pubescent; palpi long, slightly tlilated, 

 hairy. Acrostichals long, three or four pairs proximad of suture; prealar 

 bristle over half as long as supra-alar. Abdomen slender, slightly tapered 

 to apex, segments broader than long, hypopygium large, protruding ventrally; 



TKANS. AM. ENT. SOC, XLVI. 



