124 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



sides of face on the lower half bare. Frontal bristles in a single row, de- 

 scending to base of third antennal joint, two- pairs of orbital bristles in 

 each sex. Ocellar bristles normal or vestigial, proclinate; second joint of 

 arista about as broad as long, cheeks approximately one-sixth as wide as 

 the eye height. Antennae usually inserted on or slightly above the eye 

 middle, the abdomen bearing marginal and usually discal macrochaetae. 

 Apical cell open, ending just before wing tip, third longitudinal vein 

 bearing several bristles at its base, other veins bare. 



TABLE OF SPECIES. 



1. Ocellar bristles normal, abdominal segments on the basal third to one- 



half densely gray pollinose, apical pair of scutellar bristles usually 



vertical (common throughout the U. S.) doryphorae Riley. 



Ocellar bristles vestigial, apical pair of scutellar bristles not vertical. . 2 



2. Abdomen wholly brassy gray pollinose (Mass., Conn, and Virginia), 



aberrans. Town. 



Abdomen brassy gray pollinose on the second segment and an inverted 

 triangular spot on the third concolorous, remainder of abdomen 

 shining black (Mass., Pa. and Ga.) dorsalis Coq. 



Doryphorophaga aberrans Town. 



Length 6-9 mm. Front in male about three-fourths, in female about 

 as wide as either eye, frontal vitta opaque brownish black, not as wide 

 as sides of front. Posterior half of paraf rentals golden yellowish polli- 

 nose, anterior half and the parafacials concolorous bright silvery gray 

 pollinose. Antennae black or faintly fulvous, the third antennal joint 

 in each sex about three times as long as the second, arista microscopically 

 pubescent, thickened on approximately the basal fourth, sides of face 

 from one-third to three-fifths as wide as the median depression. Thorax 

 marked with four black vittae besides a short median vitta posterior to 

 the transverse suture; three postsutural and three sternopleral macro- 

 chaetae. Scutellum clothed with erect bristly black hairs on the dorsum, 

 bearing a discal pair, three pairs of long marginals and a shorter cruciate 

 apical pair of macrochaetae. ' Legs black, front pulvilli not as long as the 

 last tarsal joint, middle tibiae on the outer front side, each bearing a 

 single strong bristle near the middle; hind tibiae pectinate with a row of 

 bristles of unequal length. Abdomen with a narrow median black vitta, 

 bearing discal and marginal macrochaetae. Wings hyaline, the costal and 

 marginal cells frequently tinged with yellow, costal spine obsolete, third 

 longitudinal vein usually with three bristles at its base, calypteres milky 

 white. Puparium from 7-8 mm. in length, anal stigmata slightly raised, 

 widely separated, the dorsal surface reticulated. 



Described from 3 males and 7 females reared from Dori/pltoru 

 decemlineata Say by Mr. L. B. Ripley at New Haven, Conn., 

 September 13, 1913, and by Messrs. C. W. Collins, C. E. Hood 

 and R. T. Webber, Melrose Highlands, Mass. 



