ABT. 1«. GALLFLIES OF THE FAMILY CYNIPIDAE WELD. 13 



torted. Occurs in late summer or fall in acorns of current season's 

 crop. See notes on Blorhiza cMoradensis (Beutenmueller), p. T. 



llahitat.— The type locality is Pacific Grove, California, where 

 affected agrifolia acorns were collected November 15, 1913, by Mr. 

 J. W. Miller, who reared 20 adults March 8-2T, 1915, sent in with 

 galls under Hopkins U. S. No. 10867& and for whom the species is 

 named. The writer collected some at Palo Alto, August 10, 1915. 

 and cut out a pupa September 17, 1917, and a living fly December 19. 

 1917. indicating that transformation takes place the fall before emer- 

 gence. The writer has also taken the galls at Alpine, Pasadena, Santa 

 Barbara, Paso Robles, Los Gatos, and St. Helena, California. The 

 writer found similar galls in old wislizeni acorns at Camp Baldy, June 

 15, 1918, and living adults were cut out December 2, 1919, and an equal 

 number of larvae found indicating that the emergence is distributed 

 over at least two seasons. These flies agree with those from agrifolia 

 acorns except that they average 2.6 mm. instead of 2.8 mm. in length. 

 Similar ones were seen in the San Gabriel River canyon in the San 

 Gabriel Mountains and at Bagby in the Sierras. Mr. F. H. Herbert 

 sent in similar galls in acorns in calif omica from Onion Valley, in El- 

 dorado County, under Hopkins U. S. No. 13643c and from Los Gatos 

 under Hopkins U. S. No. 13673e. From the latter five flies emerged 

 March 31 to April 15. They are similar to the others except in being 

 larger, averaging 3.1 mm., and they are included in the type series. 



CALLIRHYTIS PETRINA. new species. 



Female. — Head, prothorax and mesoscutum reddish-broAvn, rest of 

 thorax infuscated, abdomen black. Head distinctly broader than 

 thorax, coriaceous, seen from above axial line half width of head, 

 cheeks gibbous; facial line .76 transfacial, clypeus emarginate, inter- 

 ocular space .55 transfacial and area 1.23 times as broad as high, 

 malar space .46 eye with parallel ridges in groove, ocellocular and 

 antennocular spaces equal, palpi 5- and 3-segmented, antennae infus- 

 cated, first five segments in balsam as 54 : 25 : 52 : 40 : 37, 6-12 

 gradually shorter, thirteenth 2.3 times preceding. Sides of pro- 

 notum rugose. Mesoscutum not shining, only slightly broader than 

 long, coriaceous, slightly rugose between parapsides posteriorly, 

 parapsidal grooves obsolete anteriorly, anterior and lateral lines 

 present. Scutellum coarsely rugose, transverse furrow at base not 

 bounded at sides and with longitudinal ridges in it but no pits. 

 Carinae on propodeum slightly bent out, almost parallel, area be- 

 tween slightly rugose. Hind tarsus shorter than tibia, second equal 

 to fifth, claws simple. Wing hyaline, all veins pale, first abscissa 

 of radius arched, second reaching margin, areolet reaching one-fifth 

 way to basal, surface short pubescent, margin not ciliate. Abdomen 



