Sept., I9I2.] Felt: New Gall Midges or Itonid^. 155 



Wings hyaline, the third vein well beyond the apex. Halteres yellowish bas- 

 ally, fuscous apically, the legs fuscous yellowish, the distal tarsal segments 

 somewhat darker ; claws stout, strongly curved, the anterior unidentate, the 

 pulvilli rudimentary. Genitalia; basal clasp segment slender, with a con- 

 spicuous, quadrate, thickly setose lobe basally ; terminal clasp segment long; 

 dorsal plate short, broadly and triangularly emarginate ; ventral plate short, 

 broad, broadly rounded, the distal third thickly short-spined. Harpes rather 

 weakly chitinized ; style long, the distal fourth slender, with about 12 feebly 

 chitinized teeth. 



Female. — Length 1.25 mm. Antennae as long as the body, sparsely 

 haired, dark brown; 14 segments, the fifth with a stem one fourth the length 

 of the cylindric basal enlargement, which latter has a length 2^ times its 

 diameter; the terminal segment cylindric, with a length seven times its diam- 

 eter and apically a somewhat fusiform, stout process one third the length of 

 the entire segment. Palpi ; first segment with a length nearly thrice its 

 diameter, the second one half longer, somewhat dilated, the third a little 

 shorter than the second, more slender, the fourth one half the length of the 

 third, more slender. Mesonotum reddish brown, the submedian lines indis- 

 tinct. Scutellum and postscutellum yellowish brown. Abdomen sparsely 

 haired, dark brown. The short ovipositor yellowish, the sparsely haired 

 terminal lobes slender, with a length five times the width. Other characters 

 nearly as in the male. 



A number of males and females were captured on a spider web 

 in a rain barrel at Port Limon, Costa Rica, September 24, 1905, by 

 Frederick Knab. This undescribed form is provisionally referred to 

 the above genus, though in certain respects it appears to closely 

 approach FelticUa Rubs. It may be distinguished from C. dent at a 

 Felt by the dark brown abdomen and the quadrate basal process of 

 the basal clasp segment. 



Karschomyia townsendi, new species. 



Male. — Length 1.75 mm. Antennae one fourth longer than the body, 

 thickly haired, light straw; 14 segments, the fifth having each stem with a 

 length 3K times its diameter, the distal enlargement subcylindric, with a 

 length one half greater than its diameter and a very thick whorl of long, 

 strongly curved, slender setae, circumfili well developed ; terminal segment, 

 basal portion of the stem with a length 7 times its diameter, the distal en- 

 largement greatly produced, tapering distally, with a length four times its 

 diameter and apically a long, finger-like process. Palpi ; first segment sub- 

 quadrate, the second with a length over thrice its diameter, the third a little 

 longer and more slender than the second, the fourth one fourth longer than 

 the third. Mesonotum fuscous yellowish orange. Scutellum, postscutellum 

 and abdomen yellowish orange. Genitalia somewhat fuscous. Wings hyaline, 

 costa light straw. Halteres yellowish transparent, slightly fuscous. Coxae 



