AKT. 9 FLIES OF THE FAMILY SYKPHIDAE SHANNON 9 



Head hemispherical, circular in outline (frontal view), face pro- 

 jecting beyond antennal prominence; front unusually narrow; ocelli 

 well advanced of occipital margin; eye nearly bordering onto oral 

 margin ; posterior oral region yellow ; dorsum of thorax bounded by 

 a yellow margin; metapleura yellow; abdomen constricted basally; 

 tergites three, four, and five, each with five longitudinal yellow 

 stripes ; post angular section of apical cross vein straight and joining 

 third vein at right angles; a conspicuous dark spot at tip of wing. 

 (Fig. 5.) 



This genus is perhaps closest to MesograTivina. The straight and 

 upright apical cross vein and the apical spot in the wing serve to 

 differentiate the two. 



CALOSTIGMA ELNORA. new species 



Female. — Face and front yellow, save for a black spot immediately 

 above base of antennae and the ocellar region; antennae small, yel- 

 low; mesonotum shining black with a median longitudinal pale pol- 

 linose stripe and a pair of similar but submedian stripes which ex- 

 tend but half the length of mesonotum ; sides of mesonotum yellow ; 

 scutellum yellow, the disk black; fore and mid legs yellow; hind 

 femur yellow with a rather broad preapical dark ring; hind tibia 

 black with a median bright yellow ring ; hind tarsi yellowish, becom- 

 ing darker apically; abdomen narrowed at juncture of first and 

 second segments, the second widening posteriorly ; first tergite black, 

 the sides yellow ; the second yellow with hind border black and two 

 pairs of longitudinal black stripes; third, fourth, and fifth tergites 

 black, each with five longitudinal yellow stripes ; wings hyaline with 

 the entire subcostal cell infuscated and a black spot at tip of wing; 

 halteres yellow ; plumula absent. 



Length 6 mm. ; wing 5 mm. 



Type locality. — Rurrenabaque, Beni, Bolivia (November 1921, 

 W. M. Mann, Mulford Biological Expedition). 



Type.—Q^it. No. 28756, U.S.N.M. 



This pretty little species is named after my wife, Elnora S. 

 Shannon. 



ALLOGRAPTA PIURANA. new species 



Female. — Resembles A. hortensis Philippi in having the distinct 

 shining black stripe extending from oral margin upwards to the hind 

 occipital margin. Differs in having a distinct light yellow spot on 

 metapleura, hind margin of scutellum black; the spots on the second 

 tergite directed obliquely backwards and those on the remaining seg- 

 ments nearly parallel to each other. (Fig. 4.) 



Length 7 mm.; wing 5 mm. 



Type locality. — Department Piura, Peru (January 11, C. H. T. 

 Townsend). 



Type.—Q2it. No. 28757, U.S.N.M. 



18121—27 2 



