Sept., 1913-] Felt: Descriptions of Gall Midges. 217 



Gall. — Length about 1.5 cm., diameter about i cm. The upper surface of 

 the leaf, usually along the midrib, is slightly contracted, while on the lower 

 side there is a turgid lateral swelling usually originating from the midvein and 

 generally (in specimens collected in 1912) showing distinct ridges or carinae. 

 In some instances series of galls attain a length of 6 or 7 cm. and in a number 

 of cases all of the leaflets of one leaf were infested. In a few instances the 

 attack developed so early as to practically prevent the formation of foliage, 

 though in most cases the leaves attained nearly full size. 



Larva. — Length 3.5 mm., white or reddish orange, moderately stout. Head 

 broad, the length being about J^ the width, the lateral angles produced pos- 

 teriorly as long, tapering, chitinous processes. Antennae relatively long and 

 tapering. Skin moderately smooth, subpapillate on the posterior segments, 

 the segmentation moderately distinct, breastbone bidentate, the shaft irregu- 

 larly chitinized and subobsolescent, posterior extremity broadly rounded. 



Cocoon. — Length 2 mm., oval and covered with coarse grains of sand. 



Exuvium. — Length 2 mm., whitish. Antennal cases extending to the first 

 abdominal segment, the wing cases to the fourth abdominal segment and the 

 leg cases nearly to the extremity of the abdomen. About three fourths of the 

 exuvium protrudes from the cell. 



Male. — Length i mm. Antennae nearly as long as the body, thickly haired, 

 dark brown; 16 segments, the fifth with a stem ^ the length of the basal 

 enlargement, which latter has a length Yz greater than its diameter ; penulti- 

 mate segment with the stem reduced and sometimes partly fused with the nar- 

 rowly oval, more reduced terminal segment. Palpi : first segment irregularly 

 quadrate, the second Yi longer, the third as long as the second and the fourth 

 Yi longer than the third. Mesonotum dark brown. Scutellum and postscu- 

 tellum fuscous yellowish. Abdomen reddish brown. Wings with third vein 

 distinctly curved anteriorly. Halteres fuscous yellowish. Coxae and femora 

 mostly fuscous yellowish. Tibiae and tarsi dark brown, the pulvilli nearly as 

 long as the claws. Genitalia : dorsal plate deeply and roundly emarginate, the 

 lobes narrowly rounded ventrally ; ventral plate deeply and roundly emarginate, 

 the lobes long, fingerlike. Harpes produced, irregularly dentate apically. 



Female. — Length 1.25 mm. Antennae about half the length of the body, 

 sparsely haired, dark brown; 17 sessile segments, the fifth with a length Y\ 

 greater than its diameter, the terminal segment slightly reduced. Palpi nearly 

 as in the male, except that the fourth segment is nearly ^ longer than the 

 second. Mesonotum fuscous. Abdomen dark reddish brown. Coxae yellowish 

 orange. Ovipositor about as long as the body, the terminal lobes lanceolate, 

 with a length about three times the diameter. Otherwise as in the male. 

 Type Cecid 02293. 



ASTRODIPLOSIS new genus. 



This member of the trifiU is separated from its alHes by the uniar- 

 ticulate palpi, the well-developed circumfili, the normal mesonotum 

 and the peculiar genitalia. Though apparently allied to the Argentine 



