ART. 10 GALL-INHABITING CYNIPID WASPS WELD 15 



Type.— Cat. No. 27184, U.S.N.M. Type and 4 paratypes. Para- 

 types at American Museum, Field and Stanford. 



Host. — Quercus undulafa and Quercus toumiey'i. 



Gall (fig. 30). — Globular, spiny, single on under side of leaf on 

 midrib in fall, monothalamous, 7-10 mm. in diameter. The wall of 

 the gall is half a millimeter thick, hard and crystalline, covered 

 with yellow spines 2.5 mm. long with swollen bases half a millimeter 

 in diameter which are pinkish in color and polygonal by mutual 

 pressure in cross-section. When detached a rosette of single-celled 

 short colorless hairs is found about the base of each spine. The 

 exit hole, 1.2 mm. in diameter is in the side of the gall. It is similar 

 in structure to some of the Acjrispis galls in the east. 



Habitat . — The type is selected from galls collected November 7, 

 1921, in Blue Canyon west of Socorro, N. Mex., the files being cut 

 out of the galls a few days later. Paratypes are from Nogal Canyon 

 south of Socorro, the flies emerging December 31 and January 13. 

 Other paratypes are from Hackberry, Ariz., the flies having emerged 

 and died before February 14. All the above were on Q. undulata. 

 One paratype is from Q, toumeyi, Patagonia, Ariz., the fly emerg- 

 ing December 31. Galls were seen on Q. undulata at Ashfork, Ariz., 

 also and in the Burro Mountains, N. Mex. , 



DIPLOLEPIS AGGREGATA, new species 



Female. — Reddish-brown; eyes, anterior, and lateral lines, meso- 

 and metapleurae and parts of abdomen black. Head transverse, 

 narrower than thorax, pubescent, occiput concave, cheeks broad- 

 ened behind eyes and margined, vertex rugose. Facial quad- 

 rangle broader than high, malar space one-third eye, without 

 groove. Antennae 14-segmented, lengths as (scape) 18 (width 11) : 8: 

 38 (7) : 40 : 33 : 29 : 24 : 21 : 17 : 13 : 11 : 10 : 9 : 10 (6) , flagellum gradually 

 tapering to apex. Sides of pronotum rugose, hairy. Mesoscutum 

 smooth, shining, covered with setigerous punctures but pubescence 

 not dense enough to hide sculpture. Parapsidal grooves deep, 

 smooth, percurrent, separation behind not three times Avidth of a 

 groove, no median, lateral lines bare, prominent, anterior lines nar- 

 rower, parallel, Scutellum coarsely rugose, margined on sides, disk 

 rather flat, two pits at base, covered with erect pubescence. Spiracu- 

 lar areas of propodeum smooth, the usual carinae diverging below 

 and suddenly constricting on to the reticulate neck, enclosed area 

 somewhat reticulate. INIesopleura smooth below the broad striate 

 longitudinal depression. Wing pubescent and ciliate, the veins 

 heavily clouded, a group of connected spots in distal part of third 

 cubital cell and a diffused cloud at its base under the radial cell, a 

 faint cloud under the areolet, clouded also about break in the anal 

 vein and in basal half of costal cell; areolet reaching one-fifth way 



