272 



PSrCHB. 



[August iSgj. 



joint, knees of middle and of liind legs and 

 the tips of tlieir tibiae, lionej vellow. Wings 

 h}'aline, the veins brown, the marginal vein 

 linear but rather stout, twice as long as the 

 stigmal, the post-marginal slender, a little 

 longer than the stigmal. The flagellum is 

 about tliree and a half times as long as the 

 scape; the funicle 5-jointed, the first joint the 

 longest, not quite twice as long as thick, the 

 following joints imperceptibly shortening, 

 submoniliform ; club 3-jointed, a little longer 

 than the first two fimicular joints united, the 

 joints closelj conjoined. Thorax as in R. 

 diastroplii. Abdomen conicallv pointed, 

 subcompresscd, nearly one-half longer than 

 the head and thorax united, smooth anil jiol- 



ished, except segments 6, 7 and 9 which are 

 finely shagreened from some microscopic 

 punctures and bearded with white hairs. 



J. Length 2.5 mm. Agrees with the % 

 in color, but the funicular joints are incised 

 and pedicellate at tips, the thickened portion 

 being furnished with two whorls of long 

 white hairs, some of wliich are as long as the 

 joints, the latter very gradually decreasing 

 in length; the club is as long as the first fun- 

 icular joint, but slenderer; while the body of 

 the abdomen is small, compressed and as 

 viewed from the side triangular in outline 

 attached to the metathorax by a long petiole 

 wliich is finely sculptured or shagreened and 

 nearlv as long as the bodv of the abdomen. 



PRICKLY- LEAF-GALL 



OF RHODITES 

 FENDLERL 



TUMIDUS ON ROSA 



nV C. II. TYLER TOWNSEND. BKOWN.SVILI.E, TEXA.S. 



A few miles to tlie north of Ojo 

 Calieiito, on the Hot Springs reserva- 

 tion, in Socorro County, New Mexico, 

 some spherical prickly galls were 

 found in bunches on the leaves of a 

 wild rose, June iS, 1S92. They were 

 the size of very large peas, reddish antl 

 greenish, and covered with prickles 

 One of these galls that was openetl 

 Dec. 13, 1S93, containetl a whitish live 

 hymenopterous pupa, which was some- 

 what active. This was the pupa of the 

 gall-maker, RJioditcs tiduidiis Bass. 



Description of gall. — Diameter 3 to 9 mm. 

 Usual size, 6 to S mm. Globular, or sub- 

 globular, covered with prickles on upper half, 

 prickles mostly directed upward especially 

 the more superior ones which are from i to 

 i4 uim. long, those on sides mucli shorter. 

 Color brick-reddish above, and pea-green 

 below, indicating the surface that has been 



exposed to tiie sun ami that which has been 

 sheltered therefrom. Growing in bunches, 

 from 2 to 10 in a bunch, rarely singly. 

 Borne always on upper surface of leaf, some- 

 times three on the same very small leaf 

 which is thus almost obliterated, sometimes 

 borne on petiole of leaf, often double. Gall 

 containing a single large perfectly round cav- 

 ity, lined with a very thin greenish lining, 

 walls \\ mm. thick in gall of 8 mm. external 

 diameter, leaving cavity about 5^ mm. in 

 diameter. Walls porous, minutely cellular, a 

 cross section appearing finely reticulate under 

 lens, the lining of cavity sharing this appear- 

 ance. The walls average i mm. in thickness. 

 Each gall contains but a single occupant. 

 The double ones never communicate inside. 

 The gall-fly emerges b^' a circular hole 

 gnawed in one side of the gall about i.i mm. 

 in diameter. 



Described from 38 galls. From two 

 of these galls, two gall-flies had 



