276 



NEW YORK STATE MUSEUM 



Rhopalomyia bigeloviae Ckll. 



1889 Cockerell, T. D. A, Ent. Month. Mag., 25: 324, 363 (Cecidomyia) 



1890 — ■ Ent. Month. Mag., 26: 109 (Cecidomyia, p. 324; note) 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 368 



The gall produced by this species was first observed by Professor 

 Cockerell in Colorado during 1889, adults being obtained the latter 

 part of that year and described in 1900. This species was reared 

 from a hollow gall on Bigelovia, apparently nothing but females 

 being obtained. It is possible that further study may show 

 R. bigelovioidestobe but a larger form of this species. For the 

 present it seems advisable to make a distinction between the two. 

 The following characterization of this species is drafted from a speci- 

 men received from the United States National Museum and labeled 

 Cecidomyia bigeloviae. It is undoubtedly a cotype. It also 

 bore the following labels: " from gall on Bigelovia, May 1889. T. D. 

 A. Cockerell, Custer co.. Col." A species of Trypeta described by 

 Professor Cockerell asT. bigeloviae has also been reared from this 

 deformity together with examples of Anthonomus canus 

 Lee, a species of Torymus and Eurytoma bigeloviae 

 Ashm. 



The egg of this species has been described by Professor Cockerell, 

 as elongate, with rounded ends, approximately parallel sides and 

 orange contents. 



Female. Length 2.5 mm. Antennae extending to the third 

 abdominal segment, sparsely haired, pale yellowish or brownish; 



Fig. 89 Rhopalomyia bigeloviae; fifth antennal segment and palpus 

 of female, enlarged (original) 



15 sessile segments, the fifth with a length one-half greater than its 

 diameter, somewhat rounded at both extremities; terminal segment 

 produced, with a length over three times its diameter. Palpi; 

 one slender, fusiform segment, having a length fully four times its 

 diameter and constricted at the point of insertion, cfistally tapering, 

 acute. Mesonotum light reddish brown. Scutellum a httle darker. 



