104 NEW YORK STATE MUSEUM 



angles greatly produced though not dentate as in Sackenomyia, the 

 shaft slender, strongly chitinized. Skin coarsely shagreened ; pos- 

 terior extremity broadly rounded. 



Male. Length 2 mm. Antennae extending to the fourth abdo- 

 minal segment, dark brown; 18 or 19 segments, the fifth with a 

 stem about three-fourths the length of the basal enlargement, which 

 latter has a length about twice its diameter, terminal segment some- 

 what produced, cylindric, with a length about three times its 

 diameter and distally tapering irregularly to a subacute apex. 

 Palpi ; the first segment irregular, stout, with a length over twice 

 its diameter, the second a little shorter, subrectangular, the third 

 one-half longer than the second, more slender, the fourth about as 

 long as the third. Mesonotum dark brown, the submedian lines 

 thickly haired. Scutellum dark brown, postscutellum fuscous yel- 

 lowish. Abdomen dark reddish brown, sparsely haired ; genitalia 

 dark brown. Wings hyaline, costa yellowish, subcosta uniting with 

 the anterior margin before the basal half. Halteres fuscous, reddish 

 apically. Legs tinged with reddish and thickly clothed with silvery 

 scales ; claws long, slender, evenly curved, the pulvilli a little longer 

 than the claws. Genitalia ; basal clasp segment long, slender ; ter- 

 minal clasp segment rather short, stout ; dorsal plate long, broad, 

 deeply and triangularly emarginate ; ventral plate long, broad, deeply 

 and roundly emarginate. Harpes long, stout, tapering, irregularly 

 truncate, with several subquadrate chitinous spurs. 



Female. Length 3.25 mm. Antennae extending to the second 

 abdominal segment, light brown, the basal segments fuscous yellow- 

 ish ; 18 segments, subsessile, the fifth with a length about two and 

 one-half times its diameter ; terminal segment slightly produced, 

 with a length over twice its diameter and tapering to an acute apex. 

 Palpi ; the first segment short, stout, subquadrate, the second with 

 a length about two and one-half times its diameter, subrectangular, 

 the third about as long as the second, more slender, the fourth a 

 little longer and more slender than the third ; face fuscous yellowish. 

 Mesonotum reddish brown, the submedian lines thickly haired. 

 Scutellum reddish orange, postscutellum orange. Abdomen reddish 

 brown, membrane and pleurae deep orange ; ovipositor fuscous 

 yellowish. Wings hyaline, costa dark brown. Halteres light fus- 

 cous yellowish. Coxae and base of femora fuscous yellowish, the 

 femora distally, tibiae and tarsi dark brown, the latter almost black ; 

 the pulvilli as long as the claws. Ovipositor about as long as the 

 abdomen, the terminal lobes with a length nearly four times their 

 width, tapering, narrowly rounded. Type Cecid. a 1822. 



Rhabdophaga cephalanthi Felt 



1908 Felt, E. P. N. Y. State Mus. Bui. 124. p. 355 



This yellowish brown form was reared at the division of ento- 

 mology. United States Department of Agriculture, from twigs of 

 button ball, Cephalanthus occiden talis, collected by 

 Rev. J. L. Zabriskie at Nyack, N. Y., January 7, 1884. 



