550 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 90 



to October 2, 1939. All the material was reared from phlox by Dr. 

 C. R. Neiswander. Described from numerous specimens. 

 Ty^e male and 74 paratypes. — U. S. N. M. No. 54187. 



Genus LESTODIPLOSIS Kieflfer 



LESTODIPLOSIS MACULIPENNIS, new species 



This species is superficially very similar to HyperdiplosiB phlox 

 and was reared from the same plant material. The principal 

 differences are found in the wing, the female antenna, and the male 

 genitalia. 



Male. — Length 1.25 mm. Differs from Hyperdlplasis phlox in the 

 following characters: Antenna about twice the length of the body, 

 binodose, mostly pale yellow, with 14 segments, the fifth segment 

 (fig. 24, /) with three circumfili; the middle circumfilus shorter than 

 the other two; the basal node rounded, the upper and lower stems 

 about three times as long as their diameter. Abdomen pale, dull 

 yellow, darker on the basal third. Genitalia (fig. 24 G) : Basal 

 segment of clasper large, three times as long as its greatest width; 

 the apical half much thicker than the basal portion; a pointed pro- 

 jection on the inner side just below the middle; dorsal plate broad, 

 very deeply and very narrowly emarginated; each lobe simple and 

 elliptical in form; ventral plate broad and rounded, with the apical 

 edge nearly straight ; style narrow, broadly round at the apex, slight- 

 ly longer than the basal segment of the clasper. Wing (fig. 24, /) 

 with the basal petiole shorter than in phlox; color pale luteous; 

 black hairs forming two diagonal crossbands, one in the middle and 

 the other at the apical portion of the wing; much darker areas at 

 the apices of all the veins and indefinite spots before and beyond the 

 apex of the third vein. Halteres pale yellow. Legs nearly uniformly 

 dark brown, femora paler ventrally. 



Female. — Length 1 to 1.25 mm. Like the male except for the 

 following differences: Antenna with 13 segments, the fifth segment 

 (fig. 24, H) with the stem as long as the basal enlargement about six 

 times as long as its greatest diameter and slightly narrower at the 

 base and near the outer end ; basal enlargement twice as long as its 

 greatest diameter, somewhat constricted in the middle; two circum- 

 fili, the upper one in narrow loops; the lower loops much broader 

 and somewhat triangular in shape. Palpus quadriarticulate ; basal 

 segment one-half as long as the second; segments 2 to 4 of equal 

 length. 



Last-instar larva (fig. 24, Z', L). — Length 1.75 to 2.5 mm. Body 

 composed of 12 segments in addition to the small head, which tapers 

 sharply anteriorly; first thoracic segment tapering slightly toward 



