Sept., i9i6.] Felt: New Western Gall Midges. 183 



points on the distal three-fourtlis of the dorsum of the abdominal segments. 



Male. — Length 1.5 mm. Antennae hardly reaching to the base of the ab- 

 domen, sparsely haired, black; 16 segments, the fifth with a length a little 

 greater than its diameter ; terminal segment reduced, narrowly oval. Palpi ; 

 first segment short, subquadrate, the second narrowly oval, the third a little 

 longer, more slender, the fourth one-half longer and more slender than the 

 third. Mesonotum, scutellum and postscutellum probably black. Abdomen 

 dark brown, the segments posteriorly sparsely margined with dull silvery scales. 

 Genitalia yellowish. Wings hyaline, the third vein uniting with the dark 

 brown costa at the basal third, the discal spot obsolete. Halteres and legs 

 mostly pale yellowish straw, the distal portion of femora and the basal por- 

 tion of tibiae and the distal tarsal segments yellowish white ; claws slender, 

 strongly curved, the pulvilli as long as the claws. Genitalia ; basal clasp seg- 

 ment rather long, slender ; terminal clasp segment rather short, swollen basally ; 

 dorsal plate moderately long, broad, deeply and roundly emarginate, the lobes 

 narrowly rounded ; ventral plate moderately long, broad, roundly truncate. 

 Harpes broad at base, tapering to a slender, prolonged, chitinous internal tooth. 



Female. — Length 2 mm. Antennae reaching nearly to the base of the ab- 

 domen, sparsely haired, black ; 20 segments, the fifth with a length three-fourths 

 its diameter ; terminal segment broadly oval. Palpi ; first segment subquadrate, 

 the second narrowly oval, the third a little longer and more slender, the fourth 

 one-half longer than the third. Ovipositor about one-half the length of the 

 abdopien, the terminal lobes slender, with a length five times the width, sparsely 

 setose and narrowly rounded apically. Color characters presumably nearly as 

 in the male. Type Cecid. 32715, Webster 11,881. 



Rhopalomyia enceliae new species. 



A series of midges were reared April 18 and 20, 1913, by Mr. P. 

 H. Timberlake from a greenish or dark gray, conical, globose, thick- 

 walled gall sometimes confluent and distorting the stem. This species 

 is easily distinguished from all other American Rhopalomyias de- 

 scribed as having but fourteen antennal segments. 



Gall. — Conical, thick-walled, lateral bud gall, length 6 mm., diameter 3 

 mm., frequently confluent basally, sometimes twisting the stem and producing 

 a marked deformation of the plant. The apex of individual galls may be 

 evenly rounded or flattened with flaring lips, which latter are sometimes pro- 

 duced as small, leafy expansions. There is a more or less distinct orifice as 

 in the case of galls produced by Phytophaga rigidcr O. S. 



Female. — Length 2.5 mm. Antennae extending to the second abdominal 

 segment, sparsely haired, brown, the basal segments black; 14 subsessile seg- 

 ments, the fifth with a stem about one-fifth the length of the subcylindric basal 

 enlargement, which latter has a length two and one-half times its diameter; 

 terminal segment somewhat produced, evidently composed of two closely fused 

 and with a length about three and one-half times its diameter. Palp consist- 



